# CVE-2022-1834: Mozilla Thunderbird and 1 other: Improper Certificate Validation CVE-2022-1834 is fixed in 7 products on 2 platforms, first by RLSA-2022:4887, released June 2, 2022. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2022-1834 - Priority: High - CVSS: 9.8 (Important) - EPSS: 0.0040 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: May 31, 2022 - Weakness: CWE-295: Improper Certificate Validation - Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2022-1834 ## Description When displaying the sender of an email, and the sender name contained the Braille Pattern Blank space character multiple times, Thunderbird would have displayed all the spaces. This could have been used by an attacker to send an email message with the attacker's digital signature, that was shown with an arbitrary sender email address chosen by the attacker. If the sender name started with a false email address, followed by many Braille space characters, the attacker's email address was not visible. Because Thunderbird compared the invisible sender address with the signature's email address, if the signing key or certificate was accepted by Thunderbird, the email was shown as having a valid digital signature. This vulnerability affects Thunderbird < 91.10. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Windows apps | Mozilla Thunderbird (en-US) | 102.0 | [Mozilla Thunderbird (en-US) 102.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird-102.0.md) | Jun 29, 2022 | | Linux | thunderbird Debian 12.15 (bookworm) | 1:91.10.0-1 | [DEBIAN-CVE-2022-1834](https://patchblox.com/security/data/fix/linux/debian-cve-2022-1834.md) | Dec 22, 2022 | | Linux | thunderbird Debian 13.5 (trixie) | 1:91.10.0-1 | [DEBIAN-CVE-2022-1834](https://patchblox.com/security/data/fix/linux/debian-cve-2022-1834.md) | Dec 22, 2022 | | Linux | thunderbird Debian 14 | 1:91.10.0-1 | [DEBIAN-CVE-2022-1834](https://patchblox.com/security/data/fix/linux/debian-cve-2022-1834.md) | Dec 22, 2022 | | Linux | thunderbird RHEL 8 | 0:91.10.0-1.el8_6 | [RHSA-2022:4887](https://patchblox.com/security/data/fix/linux/rhsa-2022-4887.md) | Jun 3, 2022 | | Linux | thunderbird RHEL 9 | 0:91.10.0-1.el9_0 | [RHSA-2022:4892](https://patchblox.com/security/data/fix/linux/rhsa-2022-4892.md) | Jun 3, 2022 | | Linux | thunderbird Ubuntu 18.04.6 LTS (bionic) | 1:91.11.0+build2-0ubuntu0.18.04.1 | [thunderbird 1:91.11.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-1-91.11.0-build2-0ubuntu0.18.04.1.md) | Jul 4, 2022 | | Linux | thunderbird Ubuntu 20.04 LTS (focal) | 1:91.11.0+build2-0ubuntu0.20.04.1 | [thunderbird 1:91.11.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-1-91.11.0-build2-0ubuntu0.20.04.1.md) | Jul 4, 2022 | | Linux | thunderbird Ubuntu 22.04.1 LTS (jammy) | 1:91.11.0+build2-0ubuntu0.22.04.1 | [thunderbird 1:91.11.0+build2-0ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-thunderbird-1-91.11.0-build2-0ubuntu0.22.04.1.md) | Jul 4, 2022 | | Linux | thunderbird ol 8 | 0:91.10.0-1.0.1.el8_6 | [ELSA-2022-4887](https://patchblox.com/security/data/fix/linux/elsa-2022-4887.md) | Jun 6, 2022 | | Linux | thunderbird ol 9 | 0:91.10.0-1.0.1.el9_0 | [ELSA-2022-4892](https://patchblox.com/security/data/fix/linux/elsa-2022-4892.md) | Jun 30, 2022 | | Linux | thunderbird rocky 8 | 0:91.10.0-1.el8_6 | [RLSA-2022:4887](https://patchblox.com/security/data/fix/linux/rlsa-2022-4887.md) | Jun 2, 2022 | | Linux | thunderbird-gnome-support Ubuntu 18.04.6 LTS (bionic) | 1:91.11.0+build2-0ubuntu0.18.04.1 | [thunderbird-gnome-support 1:91.11.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-gnome-support-1-91.11.0-build2-0ubuntu0.18.04.1.md) | Jul 4, 2022 | | Linux | thunderbird-gnome-support Ubuntu 20.04 LTS (focal) | 1:91.11.0+build2-0ubuntu0.20.04.1 | [thunderbird-gnome-support 1:91.11.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-gnome-support-1-91.11.0-build2-0ubuntu0.20.04.1.md) | Jul 4, 2022 | | Linux | thunderbird-gnome-support Ubuntu 22.04.1 LTS (jammy) | 1:91.11.0+build2-0ubuntu0.22.04.1 | [thunderbird-gnome-support 1:91.11.0+build2-0ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-thunderbird-gnome-support-1-91.11.0-build2-0ubuntu0.22.04.1.md) | Jul 4, 2022 | | Linux | thunderbird-mozsymbols Ubuntu 18.04.6 LTS (bionic) | 1:91.11.0+build2-0ubuntu0.18.04.1 | [thunderbird-mozsymbols 1:91.11.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-mozsymbols-1-91.11.0-build2-0ubuntu0.18.04.1.md) | Jul 4, 2022 | | Linux | thunderbird-mozsymbols Ubuntu 20.04 LTS (focal) | 1:91.11.0+build2-0ubuntu0.20.04.1 | [thunderbird-mozsymbols 1:91.11.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-mozsymbols-1-91.11.0-build2-0ubuntu0.20.04.1.md) | Jul 4, 2022 | | Linux | thunderbird-mozsymbols Ubuntu 22.04.1 LTS (jammy) | 1:91.11.0+build2-0ubuntu0.22.04.1 | [thunderbird-mozsymbols 1:91.11.0+build2-0ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-thunderbird-mozsymbols-1-91.11.0-build2-0ubuntu0.22.04.1.md) | Jul 4, 2022 | | Linux | xul-ext-calendar-timezones Ubuntu 18.04.6 LTS (bionic) | 1:91.11.0+build2-0ubuntu0.18.04.1 | [xul-ext-calendar-timezones 1:91.11.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-calendar-timezones-1-91.11.0-build2-0ubuntu0.18.04.1.md) | Jul 4, 2022 | | Linux | xul-ext-calendar-timezones Ubuntu 20.04 LTS (focal) | 1:91.11.0+build2-0ubuntu0.20.04.1 | [xul-ext-calendar-timezones 1:91.11.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-calendar-timezones-1-91.11.0-build2-0ubuntu0.20.04.1.md) | Jul 4, 2022 | | Linux | xul-ext-calendar-timezones Ubuntu 22.04.1 LTS (jammy) | 1:91.11.0+build2-0ubuntu0.22.04.1 | [xul-ext-calendar-timezones 1:91.11.0+build2-0ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-xul-ext-calendar-timezones-1-91.11.0-build2-0ubuntu0.22.04.1.md) | Jul 4, 2022 | | Linux | xul-ext-gdata-provider Ubuntu 18.04.6 LTS (bionic) | 1:91.11.0+build2-0ubuntu0.18.04.1 | [xul-ext-gdata-provider 1:91.11.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-gdata-provider-1-91.11.0-build2-0ubuntu0.18.04.1.md) | Jul 4, 2022 | | Linux | xul-ext-gdata-provider Ubuntu 20.04 LTS (focal) | 1:91.11.0+build2-0ubuntu0.20.04.1 | [xul-ext-gdata-provider 1:91.11.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-gdata-provider-1-91.11.0-build2-0ubuntu0.20.04.1.md) | Jul 4, 2022 | | Linux | xul-ext-gdata-provider Ubuntu 22.04.1 LTS (jammy) | 1:91.11.0+build2-0ubuntu0.22.04.1 | [xul-ext-gdata-provider 1:91.11.0+build2-0ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-xul-ext-gdata-provider-1-91.11.0-build2-0ubuntu0.22.04.1.md) | Jul 4, 2022 | | Linux | xul-ext-lightning Ubuntu 18.04.6 LTS (bionic) | 1:91.11.0+build2-0ubuntu0.18.04.1 | [xul-ext-lightning 1:91.11.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-lightning-1-91.11.0-build2-0ubuntu0.18.04.1.md) | Jul 4, 2022 | | Linux | xul-ext-lightning Ubuntu 20.04 LTS (focal) | 1:91.11.0+build2-0ubuntu0.20.04.1 | [xul-ext-lightning 1:91.11.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-lightning-1-91.11.0-build2-0ubuntu0.20.04.1.md) | Jul 4, 2022 | | Linux | xul-ext-lightning Ubuntu 22.04.1 LTS (jammy) | 1:91.11.0+build2-0ubuntu0.22.04.1 | [xul-ext-lightning 1:91.11.0+build2-0ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-xul-ext-lightning-1-91.11.0-build2-0ubuntu0.22.04.1.md) | Jul 4, 2022 | --- Data as of 2026-11-08T00:53:09Z UTC. 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