Medium severity6.5NVD Advisory· Published Jun 24, 2025· Updated Apr 13, 2026
CVE-2025-6429
CVE-2025-6429
Description
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.
Affected products
2cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*+ 1 more
- cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*range: <140.0
- cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*range: <128.12.0
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
7- www.mozilla.org/security/advisories/mfsa2025-51/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2025-53/nvdVendor Advisory
- bugzilla.mozilla.org/show_bug.cginvdPermissions Required
- lists.debian.org/debian-lts-announce/2025/06/msg00029.htmlnvd
- lists.debian.org/debian-lts-announce/2025/07/msg00002.htmlnvd
- www.mozilla.org/security/advisories/mfsa2025-54/nvd
- www.mozilla.org/security/advisories/mfsa2025-55/nvd
News mentions
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