CVE-2025-6429

Name
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 affects Firefox < 140, Firefox ESR < 128.12, Thunderbird < 140, and Thunderbird < 128.12.
NVD Severity
unknown
Other trackers
CVE, NVD, CERT, CVE Details, CIRCL, Arch Linux, Debian, Red Hat, Ubuntu, Gentoo, SUSE (Bugzilla), SUSE (CVE), Mageia
Mailing lists
oss-security, full-disclosure, bugtraq
Exploits
Exploit DB, Metasploit
Forges
GitHub (code, issues), Aports (code, issues)

References

Type URI
security@mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=1970658
security@mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-51/
security@mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-53/
security@mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-54/
security@mozilla.org https://www.mozilla.org/security/advisories/mfsa2025-55/
af854a3a-2127-422b-91ae-364da2661108 https://lists.debian.org/debian-lts-announce/2025/06/msg00029.html
af854a3a-2127-422b-91ae-364da2661108 https://lists.debian.org/debian-lts-announce/2025/07/msg00002.html

Match rules

CPE URI Source package Min version Max version
firefox >= unspecified < 140
firefox-esr >= unspecified < 128.12
thunderbird >= unspecified < 140
thunderbird >= unspecified < 128.12

Vulnerable and fixed packages

Source package Branch Version Maintainer Status
firefox edge-community 133.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox-esr edge-community 128.5.1-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox-esr edge-community 128.6.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox edge-community 134.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox edge-community 134.0.1-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox edge-community 134.0.1-r1 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox-esr edge-community 128.7.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox edge-community 135.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox edge-community 135.0.1-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox-esr edge-community 128.8.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox edge-community 136.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox edge-community 136.0.2-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox edge-community 136.0.3-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox edge-community 136.0.4-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox-esr edge-community 128.8.1-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox-esr edge-community 128.9.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox edge-community 137.0.1-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox edge-community 138.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox-esr edge-community 128.10.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox edge-community 138.0-r1 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox edge-community 138.0.1-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox edge-community 138.0.3-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox edge-community 138.0.4-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox-esr edge-community 128.10.1-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox-esr edge-community 128.11.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox edge-community 139.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox edge-community 139.0-r1 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox-esr edge-community 128.11.0-r1 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox edge-community 139.0.4-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox-esr edge-community 128.11.0-r2 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox 3.22-community 136.0.4-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox-esr 3.22-community 128.10.1-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
firefox-esr 3.22-community 128.11.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 128.5.1-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 128.5.2-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 128.6.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 128.7.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 128.7.1-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 128.8.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 137.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 137.0.1-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 138.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 138.0-r1 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 138.0-r2 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird edge-community 139.0.2-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable
thunderbird 3.22-community 128.11.0-r0 Patrycja Rosa <alpine@ptrcnull.me> possibly vulnerable