CVEvulnerability
CVE-2025-6429
6.5 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2025-06-24
- Last modified
- 2026-09-30
- Assigner
- [email protected]
- CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
- 6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
- Weaknesses
- CWE-116
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 configurations
• mozilla firefox (< 128.12.0)
• mozilla firefox (< 140.0)
Related
Weakness · CWE (1)
- CWE-116 Improper Encoding or Escaping of Output weakness
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1970658 Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2025-51/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-53/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-54/ www.mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2025-55/ www.mozilla.org
- https://lists.debian.org/debian-lts-announce/2025/06/msg00029.html lists.debian.org
- https://lists.debian.org/debian-lts-announce/2025/07/msg00002.html lists.debian.org