# CVE-2026-0818: CSS-based exfiltration of the content from partially encrypted emails when allowing remote content

CVE-2026-0818 is fixed in 139 products on 2 platforms, first by Mozilla Thunderbird (af) 147.0.1, released January 28, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-0818
- Priority: Routine
- CVSS: 4.3 (Medium)
- EPSS: 0.0018
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 28, 2026
- Weakness: CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-0818

## Description

When a user explicitly requested Thunderbird to decrypt an inline OpenPGP message that was embedded in a text section of an email that was formatted and styled with HTML and CSS, then the decrypted contents were rendered in a context in which the CSS styles from the outer messages were active. If the user had additionally allowed loading of the remote content referenced by the outer email message, and the email was crafted by the sender using a combination of CSS rules and fonts and animations, then it was possible to extract the secret contents of the email. This vulnerability was fixed in Thunderbird 147.0.1 and Thunderbird 140.7.1.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | Mozilla Thunderbird (af) | 147.0.1 | [Mozilla Thunderbird (af) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.af-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (ar) | 147.0.1 | [Mozilla Thunderbird (ar) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ar-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (ast) | 147.0.1 | [Mozilla Thunderbird (ast) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ast-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (be) | 147.0.1 | [Mozilla Thunderbird (be) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.be-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (bg) | 147.0.1 | [Mozilla Thunderbird (bg) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.bg-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (br) | 147.0.1 | [Mozilla Thunderbird (br) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.br-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (ca) | 147.0.1 | [Mozilla Thunderbird (ca) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ca-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (cak) | 147.0.1 | [Mozilla Thunderbird (cak) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.cak-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (cs) | 147.0.1 | [Mozilla Thunderbird (cs) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.cs-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (cy) | 147.0.1 | [Mozilla Thunderbird (cy) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.cy-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (da) | 147.0.1 | [Mozilla Thunderbird (da) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.da-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (de) | 147.0.1 | [Mozilla Thunderbird (de) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.de-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (dsb) | 147.0.1 | [Mozilla Thunderbird (dsb) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.dsb-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (el) | 147.0.1 | [Mozilla Thunderbird (el) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.el-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (en-CA) | 147.0.1 | [Mozilla Thunderbird (en-CA) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.en-ca-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (en-GB) | 147.0.1 | [Mozilla Thunderbird (en-GB) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.en-gb-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (en-US) | 147.0.1 | [Mozilla Thunderbird (en-US) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (es-AR) | 147.0.1 | [Mozilla Thunderbird (es-AR) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.es-ar-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (es-ES) | 147.0.1 | [Mozilla Thunderbird (es-ES) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.es-es-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (es-MX) | 147.0.1 | [Mozilla Thunderbird (es-MX) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.es-mx-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (et) | 147.0.1 | [Mozilla Thunderbird (et) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.et-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (eu) | 147.0.1 | [Mozilla Thunderbird (eu) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.eu-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (fi) | 147.0.1 | [Mozilla Thunderbird (fi) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.fi-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (fr) | 147.0.1 | [Mozilla Thunderbird (fr) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.fr-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (fy-NL) | 147.0.1 | [Mozilla Thunderbird (fy-NL) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.fy-nl-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (ga-IE) | 147.0.1 | [Mozilla Thunderbird (ga-IE) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ga-ie-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (gd) | 147.0.1 | [Mozilla Thunderbird (gd) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.gd-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (gl) | 147.0.1 | [Mozilla Thunderbird (gl) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.gl-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (he) | 147.0.1 | [Mozilla Thunderbird (he) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.he-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (hr) | 147.0.1 | [Mozilla Thunderbird (hr) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.hr-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (hsb) | 147.0.1 | [Mozilla Thunderbird (hsb) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.hsb-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (hu) | 147.0.1 | [Mozilla Thunderbird (hu) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.hu-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (hy-AM) | 147.0.1 | [Mozilla Thunderbird (hy-AM) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.hy-am-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (id) | 147.0.1 | [Mozilla Thunderbird (id) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.id-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (is) | 147.0.1 | [Mozilla Thunderbird (is) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.is-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (it) | 147.0.1 | [Mozilla Thunderbird (it) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.it-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (ja) | 147.0.1 | [Mozilla Thunderbird (ja) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ja-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (ka) | 147.0.1 | [Mozilla Thunderbird (ka) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ka-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (kab) | 147.0.1 | [Mozilla Thunderbird (kab) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.kab-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (kk) | 147.0.1 | [Mozilla Thunderbird (kk) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.kk-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (ko) | 147.0.1 | [Mozilla Thunderbird (ko) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ko-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (lt) | 147.0.1 | [Mozilla Thunderbird (lt) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.lt-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (lv) | 147.0.1 | [Mozilla Thunderbird (lv) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.lv-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (ms) | 147.0.1 | [Mozilla Thunderbird (ms) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ms-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (nb-NO) | 147.0.1 | [Mozilla Thunderbird (nb-NO) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.nb-no-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (nl) | 147.0.1 | [Mozilla Thunderbird (nl) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.nl-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (nn-NO) | 147.0.1 | [Mozilla Thunderbird (nn-NO) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.nn-no-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (pa-IN) | 147.0.1 | [Mozilla Thunderbird (pa-IN) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.pa-in-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (pl) | 147.0.1 | [Mozilla Thunderbird (pl) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.pl-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (pt-BR) | 147.0.1 | [Mozilla Thunderbird (pt-BR) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.pt-br-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (pt-PT) | 147.0.1 | [Mozilla Thunderbird (pt-PT) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.pt-pt-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (rm) | 147.0.1 | [Mozilla Thunderbird (rm) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.rm-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (ro) | 147.0.1 | [Mozilla Thunderbird (ro) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ro-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (ru) | 147.0.1 | [Mozilla Thunderbird (ru) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.ru-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (sk) | 147.0.1 | [Mozilla Thunderbird (sk) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.sk-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (sl) | 147.0.1 | [Mozilla Thunderbird (sl) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.sl-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (sq) | 147.0.1 | [Mozilla Thunderbird (sq) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.sq-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (sr) | 147.0.1 | [Mozilla Thunderbird (sr) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.sr-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (sv-SE) | 147.0.1 | [Mozilla Thunderbird (sv-SE) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.sv-se-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (th) | 147.0.1 | [Mozilla Thunderbird (th) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.th-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (tr) | 147.0.1 | [Mozilla Thunderbird (tr) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.tr-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (uk) | 147.0.1 | [Mozilla Thunderbird (uk) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.uk-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (uz) | 147.0.1 | [Mozilla Thunderbird (uz) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.uz-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (vi) | 147.0.1 | [Mozilla Thunderbird (vi) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.vi-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (zh-CN) | 147.0.1 | [Mozilla Thunderbird (zh-CN) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.zh-cn-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird (zh-TW) | 147.0.1 | [Mozilla Thunderbird (zh-TW) 147.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.zh-tw-147.0.1.md) | Jan 28, 2026 |
| Windows apps | Mozilla Thunderbird ESR (af) | 153.0.1 | [Mozilla Thunderbird ESR (af) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.af-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ar) | 153.0.1 | [Mozilla Thunderbird ESR (ar) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ar-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ast) | 153.0.1 | [Mozilla Thunderbird ESR (ast) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ast-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (be) | 153.0.1 | [Mozilla Thunderbird ESR (be) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.be-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (bg) | 153.0.1 | [Mozilla Thunderbird ESR (bg) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.bg-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (br) | 153.0.1 | [Mozilla Thunderbird ESR (br) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.br-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ca) | 153.0.1 | [Mozilla Thunderbird ESR (ca) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ca-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (cak) | 153.0.1 | [Mozilla Thunderbird ESR (cak) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.cak-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (cs) | 153.0.1 | [Mozilla Thunderbird ESR (cs) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.cs-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (cy) | 153.0.1 | [Mozilla Thunderbird ESR (cy) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.cy-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (da) | 153.0.1 | [Mozilla Thunderbird ESR (da) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.da-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (de) | 153.0.1 | [Mozilla Thunderbird ESR (de) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.de-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (dsb) | 153.0.1 | [Mozilla Thunderbird ESR (dsb) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.dsb-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (el) | 153.0.1 | [Mozilla Thunderbird ESR (el) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.el-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (en-CA) | 153.0.1 | [Mozilla Thunderbird ESR (en-CA) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.en-ca-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (en-GB) | 153.0.1 | [Mozilla Thunderbird ESR (en-GB) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.en-gb-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (en-US) | 153.0.1 | [Mozilla Thunderbird ESR (en-US) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (es-AR) | 153.0.1 | [Mozilla Thunderbird ESR (es-AR) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.es-ar-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (es-ES) | 153.0.1 | [Mozilla Thunderbird ESR (es-ES) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.es-es-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (es-MX) | 153.0.1 | [Mozilla Thunderbird ESR (es-MX) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.es-mx-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (et) | 153.0.1 | [Mozilla Thunderbird ESR (et) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.et-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (eu) | 153.0.1 | [Mozilla Thunderbird ESR (eu) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.eu-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (fi) | 153.0.1 | [Mozilla Thunderbird ESR (fi) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.fi-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (fr) | 153.0.1 | [Mozilla Thunderbird ESR (fr) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.fr-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (fy-NL) | 153.0.1 | [Mozilla Thunderbird ESR (fy-NL) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.fy-nl-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ga-IE) | 153.0.1 | [Mozilla Thunderbird ESR (ga-IE) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ga-ie-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (gd) | 153.0.1 | [Mozilla Thunderbird ESR (gd) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.gd-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (gl) | 153.0.1 | [Mozilla Thunderbird ESR (gl) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.gl-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (he) | 153.0.1 | [Mozilla Thunderbird ESR (he) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.he-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (hr) | 153.0.1 | [Mozilla Thunderbird ESR (hr) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.hr-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (hsb) | 153.0.1 | [Mozilla Thunderbird ESR (hsb) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.hsb-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (hu) | 153.0.1 | [Mozilla Thunderbird ESR (hu) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.hu-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (hy-AM) | 153.0.1 | [Mozilla Thunderbird ESR (hy-AM) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.hy-am-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (id) | 153.0.1 | [Mozilla Thunderbird ESR (id) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.id-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (is) | 153.0.1 | [Mozilla Thunderbird ESR (is) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.is-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (it) | 153.0.1 | [Mozilla Thunderbird ESR (it) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.it-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ja) | 153.0.1 | [Mozilla Thunderbird ESR (ja) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ja-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ka) | 153.0.1 | [Mozilla Thunderbird ESR (ka) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ka-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (kab) | 153.0.1 | [Mozilla Thunderbird ESR (kab) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.kab-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (kk) | 153.0.1 | [Mozilla Thunderbird ESR (kk) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.kk-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ko) | 153.0.1 | [Mozilla Thunderbird ESR (ko) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ko-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (lt) | 153.0.1 | [Mozilla Thunderbird ESR (lt) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.lt-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (lv) | 153.0.1 | [Mozilla Thunderbird ESR (lv) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.lv-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ms) | 153.0.1 | [Mozilla Thunderbird ESR (ms) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ms-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (nb-NO) | 153.0.1 | [Mozilla Thunderbird ESR (nb-NO) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.nb-no-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (nl) | 153.0.1 | [Mozilla Thunderbird ESR (nl) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.nl-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (nn-NO) | 153.0.1 | [Mozilla Thunderbird ESR (nn-NO) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.nn-no-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (pa-IN) | 153.0.1 | [Mozilla Thunderbird ESR (pa-IN) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.pa-in-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (pl) | 153.0.1 | [Mozilla Thunderbird ESR (pl) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.pl-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (pt-BR) | 153.0.1 | [Mozilla Thunderbird ESR (pt-BR) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.pt-br-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (pt-PT) | 153.0.1 | [Mozilla Thunderbird ESR (pt-PT) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.pt-pt-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (rm) | 153.0.1 | [Mozilla Thunderbird ESR (rm) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.rm-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ro) | 153.0.1 | [Mozilla Thunderbird ESR (ro) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ro-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (ru) | 153.0.1 | [Mozilla Thunderbird ESR (ru) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.ru-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (sk) | 153.0.1 | [Mozilla Thunderbird ESR (sk) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.sk-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (sl) | 153.0.1 | [Mozilla Thunderbird ESR (sl) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.sl-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (sq) | 153.0.1 | [Mozilla Thunderbird ESR (sq) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.sq-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (sr) | 153.0.1 | [Mozilla Thunderbird ESR (sr) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.sr-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (sv-SE) | 153.0.1 | [Mozilla Thunderbird ESR (sv-SE) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.sv-se-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (th) | 153.0.1 | [Mozilla Thunderbird ESR (th) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.th-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (tr) | 153.0.1 | [Mozilla Thunderbird ESR (tr) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.tr-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (uk) | 153.0.1 | [Mozilla Thunderbird ESR (uk) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.uk-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (uz) | 153.0.1 | [Mozilla Thunderbird ESR (uz) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.uz-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (vi) | 153.0.1 | [Mozilla Thunderbird ESR (vi) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.vi-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (zh-CN) | 153.0.1 | [Mozilla Thunderbird ESR (zh-CN) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.zh-cn-153.0.1.md) | Jul 23, 2026 |
| Windows apps | Mozilla Thunderbird ESR (zh-TW) | 153.0.1 | [Mozilla Thunderbird ESR (zh-TW) 153.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird.esr.zh-tw-153.0.1.md) | Jul 23, 2026 |
| Linux | MozillaThunderbird opensuse-leap 15.6 | 140.7.1-150200.8.254.1 | [SUSE-SU-2026:0388-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0388-1.md) | Feb 5, 2026 |
| Linux | MozillaThunderbird opensuse-leap 16.0 | 140.8.1-bp160.1.1 | [OPENSUSE-SU-2026:20391-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-20391-1.md) | Mar 18, 2026 |
| Linux | MozillaThunderbird sles 15.7 | 140.7.1-150200.8.254.1 | [SUSE-SU-2026:0388-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-0388-1.md) | Feb 5, 2026 |
| Linux | thunderbird Debian 11.6 (bullseye) | 1:140.7.1esr-1~deb11u1 | [DLA-4466-1](https://patchblox.com/security/data/fix/linux/dla-4466-1.md) | Feb 4, 2026 |
| Linux | thunderbird Debian 12.15 (bookworm) | 1:140.7.1esr-1~deb12u1 | [DSA-6118-1](https://patchblox.com/security/data/fix/linux/dsa-6118-1.md) | Feb 3, 2026 |
| Linux | thunderbird Debian 13.5 (trixie) | 1:140.7.1esr-1~deb13u1 | [DSA-6118-1](https://patchblox.com/security/data/fix/linux/dsa-6118-1.md) | Feb 3, 2026 |
| Linux | thunderbird Debian 14 | 1:140.7.1esr-1 | [DEBIAN-CVE-2026-0818](https://patchblox.com/security/data/fix/linux/debian-cve-2026-0818.md) | Jan 28, 2026 |
| Linux | thunderbird Ubuntu 22.04.1 LTS (jammy) | 1:140.7.1+build1-0ubuntu0.22.04.1 | [thunderbird 1:140.7.1+build1-0ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-thunderbird-1-140.7.1-build1-0ubuntu0.22.04.1.md) | Jan 28, 2026 |
| Linux | thunderbird-gnome-support Ubuntu 22.04.1 LTS (jammy) | 1:140.7.1+build1-0ubuntu0.22.04.1 | [thunderbird-gnome-support 1:140.7.1+build1-0ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-thunderbird-gnome-support-1-140.7.1-build1-0ubuntu0.22.04.1.md) | Jan 28, 2026 |
| Linux | thunderbird-mozsymbols Ubuntu 22.04.1 LTS (jammy) | 1:140.7.1+build1-0ubuntu0.22.04.1 | [thunderbird-mozsymbols 1:140.7.1+build1-0ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-thunderbird-mozsymbols-1-140.7.1-build1-0ubuntu0.22.04.1.md) | Jan 28, 2026 |
| Linux | xul-ext-calendar-timezones Ubuntu 22.04.1 LTS (jammy) | 1:140.7.1+build1-0ubuntu0.22.04.1 | [xul-ext-calendar-timezones 1:140.7.1+build1-0ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-xul-ext-calendar-timezones-1-140.7.1-build1-0ubuntu0.22.04.1.md) | Jan 28, 2026 |
| Linux | xul-ext-gdata-provider Ubuntu 22.04.1 LTS (jammy) | 1:140.7.1+build1-0ubuntu0.22.04.1 | [xul-ext-gdata-provider 1:140.7.1+build1-0ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-xul-ext-gdata-provider-1-140.7.1-build1-0ubuntu0.22.04.1.md) | Jan 28, 2026 |
| Linux | xul-ext-lightning Ubuntu 22.04.1 LTS (jammy) | 1:140.7.1+build1-0ubuntu0.22.04.1 | [xul-ext-lightning 1:140.7.1+build1-0ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-xul-ext-lightning-1-140.7.1-build1-0ubuntu0.22.04.1.md) | Jan 28, 2026 |

---

Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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