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 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 firefox-debugsourceUpgrade firefox | Jul 11, 2025 | Jun 24, 2025 |
| Debian | — | Upgrade thunderbirdUpgrade firefox-esr | Jun 26, 2025 | Jun 24, 2025 |
| Freebsd | — | Upgrade firefox | Jul 5, 2025 | Jul 4, 2025 |
| Mfsa2025 51 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox version 140.0 | Jun 25, 2025 | Jun 24, 2025 |
| Mfsa2025 53 | — | Upgrade to Mozilla Firefox ESR version 128.12Upgrade to the latest version of Mozilla Firefox | 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 firefox-debugsourceUpgrade thunderbirdUpgrade firefoxNo solution existsUpgrade firefox-debuginfoUpgrade firefox-x11Upgrade thunderbird-debuginfo | Jul 2, 2025 | Jun 24, 2025 |
| Rocky_linux | — | Upgrade firefox-debugsourceUpgrade firefox-x11Upgrade thunderbird-debuginfoUpgrade thunderbird-debugsourceUpgrade firefox-debuginfoUpgrade thunderbirdUpgrade firefox | Feb 5, 2026 | Jul 29, 2025 |
| Suse | — | Upgrade libpipewire-0_3-0Upgrade MozillaFirefox-translations-commonUpgrade pipewire-modulesUpgrade MozillaFirefox-translations-otherUpgrade MozillaThunderbird-translations-commonUpgrade MozillaFirefoxUpgrade mozillafirefox-branding-sleUpgrade pipewire-langUpgrade MozillaFirefox-develUpgrade pipewire-toolsUpgrade gstreamer-plugin-pipewireUpgrade pipewire-spa-plugins-0_2Upgrade xdg-desktop-portal-langUpgrade MozillaThunderbirdUpgrade xdg-desktop-portal-develUpgrade pipewireUpgrade MozillaThunderbird-translations-otherUpgrade mozillafirefox-branding-upstreamUpgrade xdg-desktop-portalUpgrade pipewire-modules-0_3Upgrade pipewire-spa-tools | Jun 27, 2025 | Jun 24, 2025 |
| Ubuntu | — | Upgrade thunderbird | Jun 26, 2025 | Jun 24, 2025 |
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