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.
CVSS Details
- CVSS 3.1 Base Score: 6.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade thunderbirdUpgrade firefox-x11Upgrade firefox | 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-debuginfoUpgrade firefox-debugsourceUpgrade 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 Mozilla Thunderbird version 140.0Upgrade to the latest version of Mozilla Thunderbird | Jul 3, 2025 | Jun 24, 2025 |
| Oracle_linux | — | Upgrade firefoxUpgrade firefox-x11 | Jul 3, 2025 | Jun 24, 2025 |
| Redhat_linux | — | Upgrade firefox-debuginfoUpgrade thunderbird-debuginfoUpgrade firefox-x11Upgrade firefoxNo solution existsUpgrade thunderbird-debugsourceUpgrade firefox-debugsourceUpgrade thunderbird | Jul 2, 2025 | Jun 24, 2025 |
| Rocky_linux | — | Upgrade thunderbirdUpgrade firefoxUpgrade firefox-debuginfoUpgrade firefox-debugsourceUpgrade thunderbird-debugsourceUpgrade firefox-x11Upgrade thunderbird-debuginfo | Feb 5, 2026 | Jul 29, 2025 |
| Suse | — | Upgrade MozillaFirefoxUpgrade mozillafirefox-branding-sleUpgrade MozillaFirefox-translations-commonUpgrade MozillaThunderbird-translations-commonUpgrade MozillaFirefox-translations-otherUpgrade pipewire-modulesUpgrade pipewire-langUpgrade libpipewire-0_3-0Upgrade MozillaThunderbirdUpgrade pipewire-toolsUpgrade MozillaFirefox-develUpgrade gstreamer-plugin-pipewireUpgrade pipewire-spa-plugins-0_2Upgrade xdg-desktop-portal-langUpgrade mozillafirefox-branding-upstreamUpgrade pipewire-modules-0_3Upgrade pipewire-spa-toolsUpgrade xdg-desktop-portal-develUpgrade xdg-desktop-portalUpgrade pipewireUpgrade MozillaThunderbird-translations-other | Jun 27, 2025 | Jun 24, 2025 |
| Ubuntu | — | Upgrade thunderbird | Jun 26, 2025 | Jun 24, 2025 |
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