CVE-2025-6429
6.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Mozilla | Firefox | 128.12 <= 128.* | unaffected |
| Mozilla | Firefox | 140 <= * | unaffected |
| Mozilla | Thunderbird | 128.12 <= 128.* | unaffected |
| Mozilla | Thunderbird | 140 <= * | unaffected |
Weaknesses
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
CVE Program Container
Additional References
- https://lists.debian.org/debian-lts-announce/2025/07/msg00002.html
- https://lists.debian.org/debian-lts-announce/2025/06/msg00029.html
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1970658
- https://www.mozilla.org/security/advisories/mfsa2025-51/
- https://www.mozilla.org/security/advisories/mfsa2025-53/
- https://www.mozilla.org/security/advisories/mfsa2025-54/
- https://www.mozilla.org/security/advisories/mfsa2025-55/
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