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 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 140.0 | 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 | — | No solution existsUpgrade thunderbirdUpgrade firefoxUpgrade thunderbird-debugsourceUpgrade firefox-debugsourceUpgrade thunderbird-debuginfoUpgrade firefox-debuginfoUpgrade firefox-x11 | Jul 2, 2025 | Jun 24, 2025 |
| Rocky_linux | — | Upgrade thunderbirdUpgrade firefox-debuginfoUpgrade firefoxUpgrade firefox-debugsourceUpgrade thunderbird-debuginfoUpgrade thunderbird-debugsourceUpgrade firefox-x11 | Feb 5, 2026 | Jul 29, 2025 |
| Suse | — | Upgrade pipewireUpgrade xdg-desktop-portal-develUpgrade pipewire-spa-plugins-0_2Upgrade xdg-desktop-portal-langUpgrade pipewire-toolsUpgrade gstreamer-plugin-pipewireUpgrade mozillafirefox-translations-commonUpgrade mozillafirefox-branding-upstreamUpgrade xdg-desktop-portalUpgrade pipewire-spa-toolsUpgrade pipewire-modules-0_3Upgrade mozillafirefox-translations-otherUpgrade mozillathunderbird-translations-otherUpgrade libpipewire-0_3-0Upgrade mozillathunderbirdUpgrade mozillafirefox-branding-sleUpgrade mozillafirefoxUpgrade pipewire-modulesUpgrade mozillafirefox-develUpgrade mozillathunderbird-translations-commonUpgrade pipewire-lang | Jun 27, 2025 | Jun 24, 2025 |
| Ubuntu | — | Upgrade thunderbird | Jun 26, 2025 | Jun 24, 2025 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub