# CVE-2023-37207: Mozilla Firefox and 4 others: A website could have obscured the fullscreen notification by using a URL with a scheme handled by an…

CVE-2023-37207 is fixed in 14 products on 2 platforms, first by Mozilla Firefox (en-US) 115.0, released July 4, 2023. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2023-37207
- Priority: High
- CVSS: 8.8 (medium)
- EPSS: 0.0074
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 5, 2023
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2023-37207

## Description

A website could have obscured the fullscreen notification by using a URL with a scheme handled by an external program, such as a mailto URL. This could have led to user confusion and possible spoofing attacks. This vulnerability affects Firefox < 115, Firefox ESR < 102.13, and Thunderbird < 102.13.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | Mozilla Firefox (en-US) | 115.0 | [Mozilla Firefox (en-US) 115.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox-115.0.md) | Jul 4, 2023 |
| Windows apps | Mozilla Firefox ESR (en-US) | 115.4.0 | [Mozilla Firefox ESR (en-US) 115.4.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.esr-115.4.0.md) | Oct 17, 2023 |
| Windows apps | Mozilla Thunderbird (en-US) | 115.8.0 | [Mozilla Thunderbird (en-US) 115.8.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird-115.8.0.md) | Feb 21, 2024 |
| Linux | firefox RHEL 8 | 0:102.13.0-2.el8_8 | [RHSA-2023:4076](https://patchblox.com/security/data/fix/linux/rhsa-2023-4076.md) | Jul 13, 2023 |
| Linux | firefox RHEL 9 | 0:102.13.0-2.el9_2 | [RHSA-2023:4071](https://patchblox.com/security/data/fix/linux/rhsa-2023-4071.md) | Jul 13, 2023 |
| Linux | firefox Ubuntu 20.04 LTS (focal) | 115.0+build2-0ubuntu0.20.04.3 | [firefox 115.0+build2-0ubuntu0.20.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-115.0-build2-0ubuntu0.20.04.3.md) | Jul 5, 2023 |
| Linux | firefox almalinux 8 | 102.13.0-2.el8_8.alma | [ALSA-2023:4076](https://patchblox.com/security/data/fix/linux/alsa-2023-4076.md) | Jul 13, 2023 |
| Linux | firefox almalinux 9 | 102.13.0-2.el9_2.alma | [ALSA-2023:4071](https://patchblox.com/security/data/fix/linux/alsa-2023-4071.md) | Jul 13, 2023 |
| Linux | firefox ol 8 | 0:102.13.0-2.0.1.el8_8 | [ELSA-2023-4076](https://patchblox.com/security/data/fix/linux/elsa-2023-4076.md) | Jul 17, 2023 |
| Linux | firefox ol 9 | 0:102.13.0-2.0.1.el9_2 | [ELSA-2023-4071](https://patchblox.com/security/data/fix/linux/elsa-2023-4071.md) | Jul 17, 2023 |
| Linux | firefox rocky 8 | 0:102.13.0-2.el8_8 | [RLSA-2023:4076](https://patchblox.com/security/data/fix/linux/rlsa-2023-4076.md) | Aug 31, 2023 |
| Linux | firefox rocky 9 | 0:102.13.0-2.el9_2 | [RLSA-2023:4071](https://patchblox.com/security/data/fix/linux/rlsa-2023-4071.md) | Jul 19, 2023 |
| Linux | firefox-esr Debian 12.15 (bookworm) | 102.13.0esr-1~deb12u1 | [DEBIAN-CVE-2023-37207](https://patchblox.com/security/data/fix/linux/debian-cve-2023-37207.md) | Jul 5, 2023 |
| Linux | firefox-esr Debian 13.5 (trixie) | 102.13.0esr-1 | [DEBIAN-CVE-2023-37207](https://patchblox.com/security/data/fix/linux/debian-cve-2023-37207.md) | Jul 5, 2023 |
| Linux | firefox-esr Debian 14 | 102.13.0esr-1 | [DEBIAN-CVE-2023-37207](https://patchblox.com/security/data/fix/linux/debian-cve-2023-37207.md) | Jul 5, 2023 |
| Linux | firefox-geckodriver Ubuntu 20.04 LTS (focal) | 115.0+build2-0ubuntu0.20.04.3 | [firefox-geckodriver 115.0+build2-0ubuntu0.20.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-geckodriver-115.0-build2-0ubuntu0.20.04.3.md) | Jul 5, 2023 |
| Linux | firefox-mozsymbols Ubuntu 20.04 LTS (focal) | 115.0+build2-0ubuntu0.20.04.3 | [firefox-mozsymbols 115.0+build2-0ubuntu0.20.04.3](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-mozsymbols-115.0-build2-0ubuntu0.20.04.3.md) | Jul 5, 2023 |
| Linux | firefox-x11 RHEL 9 | 0:102.13.0-2.el9_2 | [RHSA-2023:4071](https://patchblox.com/security/data/fix/linux/rhsa-2023-4071.md) | Jul 13, 2023 |
| Linux | firefox-x11 almalinux 9 | 102.13.0-2.el9_2.alma | [ALSA-2023:4071](https://patchblox.com/security/data/fix/linux/alsa-2023-4071.md) | Jul 13, 2023 |
| Linux | firefox-x11 ol 9 | 0:102.13.0-2.0.1.el9_2 | [ELSA-2023-4071](https://patchblox.com/security/data/fix/linux/elsa-2023-4071.md) | Jul 17, 2023 |
| Linux | thunderbird Debian 12.15 (bookworm) | 1:102.13.0-1~deb12u1 | [DEBIAN-CVE-2023-37207](https://patchblox.com/security/data/fix/linux/debian-cve-2023-37207.md) | Jul 5, 2023 |
| Linux | thunderbird Debian 13.5 (trixie) | 1:102.13.0-1 | [DEBIAN-CVE-2023-37207](https://patchblox.com/security/data/fix/linux/debian-cve-2023-37207.md) | Jul 5, 2023 |
| Linux | thunderbird Debian 14 | 1:102.13.0-1 | [DEBIAN-CVE-2023-37207](https://patchblox.com/security/data/fix/linux/debian-cve-2023-37207.md) | Jul 5, 2023 |
| Linux | thunderbird RHEL 8 | 0:102.13.0-2.el8_8 | [RHSA-2023:4063](https://patchblox.com/security/data/fix/linux/rhsa-2023-4063.md) | Jul 13, 2023 |
| Linux | thunderbird RHEL 9 | 0:102.13.0-2.el9_2 | [RHSA-2023:4064](https://patchblox.com/security/data/fix/linux/rhsa-2023-4064.md) | Jul 13, 2023 |
| Linux | thunderbird Ubuntu 20.04 LTS (focal) | 1:102.13.0+build1-0ubuntu0.20.04.1 | [thunderbird 1:102.13.0+build1-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-1-102.13.0-build1-0ubuntu0.20.04.1.md) | Jul 5, 2023 |
| Linux | thunderbird Ubuntu 22.04.1 LTS (jammy) | 1:102.13.0+build1-0ubuntu0.22.04.1 | [thunderbird 1:102.13.0+build1-0ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-thunderbird-1-102.13.0-build1-0ubuntu0.22.04.1.md) | Jul 5, 2023 |
| Linux | thunderbird almalinux 8 | 102.13.0-2.el8_8.alma | [ALSA-2023:4063](https://patchblox.com/security/data/fix/linux/alsa-2023-4063.md) | Jul 13, 2023 |
| Linux | thunderbird almalinux 9 | 102.13.0-2.el9_2.alma | [ALSA-2023:4064](https://patchblox.com/security/data/fix/linux/alsa-2023-4064.md) | Jul 13, 2023 |
| Linux | thunderbird ol 8 | 0:102.13.0-2.0.1.el8_8 | [ELSA-2023-4063](https://patchblox.com/security/data/fix/linux/elsa-2023-4063.md) | Jul 17, 2023 |
| Linux | thunderbird ol 9 | 0:102.13.0-2.0.1.el9_2 | [ELSA-2023-4064](https://patchblox.com/security/data/fix/linux/elsa-2023-4064.md) | Jul 17, 2023 |
| Linux | thunderbird rocky 8 | 0:102.13.0-2.el8_8 | [RLSA-2023:4063](https://patchblox.com/security/data/fix/linux/rlsa-2023-4063.md) | Aug 31, 2023 |
| Linux | thunderbird-gnome-support Ubuntu 20.04 LTS (focal) | 1:102.13.0+build1-0ubuntu0.20.04.1 | [thunderbird-gnome-support 1:102.13.0+build1-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-gnome-support-1-102.13.0-build1-0ubuntu0.20.04.1.md) | Jul 5, 2023 |
| Linux | thunderbird-gnome-support Ubuntu 22.04.1 LTS (jammy) | 1:102.13.0+build1-0ubuntu0.22.04.1 | [thunderbird-gnome-support 1:102.13.0+build1-0ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-thunderbird-gnome-support-1-102.13.0-build1-0ubuntu0.22.04.1.md) | Jul 5, 2023 |
| Linux | thunderbird-mozsymbols Ubuntu 20.04 LTS (focal) | 1:102.13.0+build1-0ubuntu0.20.04.1 | [thunderbird-mozsymbols 1:102.13.0+build1-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-mozsymbols-1-102.13.0-build1-0ubuntu0.20.04.1.md) | Jul 5, 2023 |
| Linux | thunderbird-mozsymbols Ubuntu 22.04.1 LTS (jammy) | 1:102.13.0+build1-0ubuntu0.22.04.1 | [thunderbird-mozsymbols 1:102.13.0+build1-0ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-thunderbird-mozsymbols-1-102.13.0-build1-0ubuntu0.22.04.1.md) | Jul 5, 2023 |
| Linux | xul-ext-calendar-timezones Ubuntu 20.04 LTS (focal) | 1:102.13.0+build1-0ubuntu0.20.04.1 | [xul-ext-calendar-timezones 1:102.13.0+build1-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-calendar-timezones-1-102.13.0-build1-0ubuntu0.20.04.1.md) | Jul 5, 2023 |
| Linux | xul-ext-calendar-timezones Ubuntu 22.04.1 LTS (jammy) | 1:102.13.0+build1-0ubuntu0.22.04.1 | [xul-ext-calendar-timezones 1:102.13.0+build1-0ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-xul-ext-calendar-timezones-1-102.13.0-build1-0ubuntu0.22.04.1.md) | Jul 5, 2023 |
| Linux | xul-ext-gdata-provider Ubuntu 20.04 LTS (focal) | 1:102.13.0+build1-0ubuntu0.20.04.1 | [xul-ext-gdata-provider 1:102.13.0+build1-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-gdata-provider-1-102.13.0-build1-0ubuntu0.20.04.1.md) | Jul 5, 2023 |
| Linux | xul-ext-gdata-provider Ubuntu 22.04.1 LTS (jammy) | 1:102.13.0+build1-0ubuntu0.22.04.1 | [xul-ext-gdata-provider 1:102.13.0+build1-0ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-xul-ext-gdata-provider-1-102.13.0-build1-0ubuntu0.22.04.1.md) | Jul 5, 2023 |
| Linux | xul-ext-lightning Ubuntu 20.04 LTS (focal) | 1:102.13.0+build1-0ubuntu0.20.04.1 | [xul-ext-lightning 1:102.13.0+build1-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-lightning-1-102.13.0-build1-0ubuntu0.20.04.1.md) | Jul 5, 2023 |
| Linux | xul-ext-lightning Ubuntu 22.04.1 LTS (jammy) | 1:102.13.0+build1-0ubuntu0.22.04.1 | [xul-ext-lightning 1:102.13.0+build1-0ubuntu0.22.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-xul-ext-lightning-1-102.13.0-build1-0ubuntu0.22.04.1.md) | Jul 5, 2023 |

---

Data as of 2026-11-08T13:06:02Z 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

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.