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Firefox could have incorrectly parsed a URL and rewritten it to the youtube.com domain when parsing the URL specified in an `embed` tag. This could have bypassed website security checks that restricted which domains users were allowed to embed. This vulnerability was fixed in Firefox 140, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade thunderbirdUpgrade firefoxUpgrade firefox-x11 | Jul 2, 2025 | Jun 24, 2025 |
| Amazon Linux Ami 2 | — | Upgrade firefox-debuginfoUpgrade firefox | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade firefox-debugsourceUpgrade firefox-debuginfoUpgrade firefox | Jul 11, 2025 | Jun 24, 2025 |
| Debian | — | Upgrade firefox-esrUpgrade thunderbird | Jun 26, 2025 | Jun 24, 2025 |
| Freebsd | — | Upgrade firefox | 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 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 firefoxUpgrade firefox-x11 | Jul 3, 2025 | Jun 24, 2025 |
| Redhat_linux | — | No solution existsUpgrade thunderbirdUpgrade firefox-debugsourceUpgrade firefoxUpgrade thunderbird-debugsourceUpgrade firefox-x11Upgrade firefox-debuginfoUpgrade thunderbird-debuginfo | Jul 2, 2025 | Jun 24, 2025 |
| Rocky_linux | — | Upgrade firefox-x11Upgrade thunderbird-debugsourceUpgrade thunderbird-debuginfoUpgrade firefox-debugsourceUpgrade firefox-debuginfoUpgrade firefoxUpgrade thunderbird | Feb 5, 2026 | Jul 29, 2025 |
| Suse | — | Upgrade MozillaThunderbirdUpgrade pipewire-modules-0_3Upgrade pipewire-spa-toolsUpgrade xdg-desktop-portalUpgrade xdg-desktop-portal-langUpgrade pipewire-toolsUpgrade MozillaFirefox-develUpgrade gstreamer-plugin-pipewireUpgrade pipewire-spa-plugins-0_2Upgrade xdg-desktop-portal-develUpgrade mozillafirefox-branding-upstreamUpgrade MozillaThunderbird-translations-otherUpgrade pipewireUpgrade MozillaThunderbird-translations-commonUpgrade mozillafirefox-branding-sleUpgrade MozillaFirefoxUpgrade pipewire-modulesUpgrade MozillaFirefox-translations-commonUpgrade MozillaFirefox-translations-otherUpgrade libpipewire-0_3-0Upgrade pipewire-lang | Jun 27, 2025 | Jun 24, 2025 |
| Ubuntu | — | Upgrade thunderbird | Jun 26, 2025 | Jun 24, 2025 |
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