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 firefoxUpgrade thunderbirdUpgrade 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 firefoxUpgrade firefox-debuginfoUpgrade firefox-debugsource | 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 Mozilla Firefox version 140.0 | Jun 25, 2025 | Jun 24, 2025 |
| Mfsa2025 53 | — | Upgrade to Mozilla Firefox ESR version 128.12 | Jun 25, 2025 | Jun 24, 2025 |
| Mozilla Thunderbird | — | Upgrade to Mozilla Thunderbird version 128.12 | Jul 3, 2025 | Jun 24, 2025 |
| Oracle_linux | — | Upgrade firefoxUpgrade firefox-x11 | Jul 3, 2025 | Jun 24, 2025 |
| Redhat_linux | — | Upgrade firefox-x11Upgrade thunderbird-debuginfoUpgrade firefox-debuginfoUpgrade thunderbirdNo solution existsUpgrade thunderbird-debugsourceUpgrade firefoxUpgrade firefox-debugsource | Jul 2, 2025 | Jun 24, 2025 |
| Rocky_linux | — | Upgrade firefox-debugsourceUpgrade thunderbird-debuginfoUpgrade thunderbird-debugsourceUpgrade firefoxUpgrade firefox-debuginfoUpgrade thunderbirdUpgrade firefox-x11 | Feb 5, 2026 | Jul 29, 2025 |
| Suse | — | Upgrade xdg-desktop-portal-langUpgrade pipewire-spa-plugins-0_2Upgrade gstreamer-plugin-pipewireUpgrade mozillafirefox-translations-commonUpgrade pipewire-toolsUpgrade pipewire-spa-toolsUpgrade xdg-desktop-portal-develUpgrade mozillafirefox-branding-upstreamUpgrade xdg-desktop-portalUpgrade pipewireUpgrade pipewire-modules-0_3Upgrade pipewire-langUpgrade libpipewire-0_3-0Upgrade mozillafirefox-branding-sleUpgrade mozillathunderbird-translations-commonUpgrade mozillafirefox-develUpgrade mozillathunderbird-translations-otherUpgrade pipewire-modulesUpgrade mozillafirefoxUpgrade mozillafirefox-translations-otherUpgrade mozillathunderbird | Jun 27, 2025 | Jun 24, 2025 |
| Ubuntu | — | Upgrade thunderbird | Jun 26, 2025 | Jun 24, 2025 |
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