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An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser, and persisted between containers and normal/private browsing mode, but not profiles. This vulnerability was fixed in Firefox 140, Firefox ESR 115.25, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade firefox-x11Upgrade firefoxUpgrade thunderbird | Jul 2, 2025 | Jun 24, 2025 |
| Amazon Linux Ami 2 | — | Upgrade firefoxUpgrade firefox-debuginfo | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade firefox-debuginfoUpgrade firefoxUpgrade firefox-debugsource | Jul 11, 2025 | Jun 24, 2025 |
| Debian | — | Upgrade firefox-esrUpgrade thunderbird | Jun 26, 2025 | Jun 24, 2025 |
| Freebsd | — | Upgrade firefoxUpgrade thunderbirdUpgrade firefox-esr | Jul 5, 2025 | Jul 4, 2025 |
| Mfsa2025 51 | — | Upgrade to Mozilla Firefox version 140.0Upgrade to the latest version of Mozilla Firefox | Jun 25, 2025 | Jun 24, 2025 |
| Mfsa2025 52 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox ESR version 115.25 | Jun 25, 2025 | Jun 24, 2025 |
| Mfsa2025 53 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox ESR version 128.12 | Jun 25, 2025 | Jun 24, 2025 |
| Mozilla Thunderbird | — | Upgrade to the latest version of Mozilla ThunderbirdUpgrade to Mozilla Thunderbird version 140.0 | Jul 3, 2025 | Jun 24, 2025 |
| Oracle_linux | — | Upgrade firefox-x11Upgrade firefox | Jul 3, 2025 | Jun 24, 2025 |
| Redhat_linux | — | Upgrade thunderbird-debugsourceUpgrade thunderbirdUpgrade firefoxUpgrade firefox-debugsourceUpgrade firefox-debuginfoUpgrade firefox-x11Upgrade thunderbird-debuginfoNo solution exists | Jul 2, 2025 | Jun 24, 2025 |
| Rocky_linux | — | Upgrade firefox-x11Upgrade firefox-debugsourceUpgrade firefox-debuginfoUpgrade thunderbirdUpgrade firefoxUpgrade thunderbird-debugsourceUpgrade thunderbird-debuginfo | Feb 5, 2026 | Jul 29, 2025 |
| Suse | — | Upgrade pipewire-spa-toolsUpgrade MozillaThunderbird-translations-otherUpgrade MozillaFirefox-translations-otherUpgrade libpipewire-0_3-0Upgrade pipewireUpgrade mozjs128Upgrade pipewire-langUpgrade MozillaFirefoxUpgrade mozillafirefox-branding-sleUpgrade pipewire-modulesUpgrade mozjs128-develUpgrade MozillaThunderbird-translations-commonUpgrade xdg-desktop-portal-langUpgrade xdg-desktop-portal-develUpgrade pipewire-toolsUpgrade xdg-desktop-portalUpgrade mozillafirefox-branding-upstreamUpgrade libmozjs-128-0Upgrade MozillaThunderbirdUpgrade MozillaFirefox-translations-commonUpgrade pipewire-spa-plugins-0_2Upgrade gstreamer-plugin-pipewireUpgrade MozillaFirefox-develUpgrade pipewire-modules-0_3 | Jun 27, 2025 | Jun 24, 2025 |
| Ubuntu | — | Upgrade thunderbird | Jun 26, 2025 | Jun 24, 2025 |
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