CVE-2025-6429

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2025-6429
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.

6.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
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/
https://www.mozilla.org/security/advisories/mfsa2025-55/
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
History

14 Jul 2025, 19:15

Type Values Removed Values Added
Summary (en) 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 and Firefox ESR < 128.12. (en) 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.
References
  • () https://www.mozilla.org/security/advisories/mfsa2025-54/ -
  • () https://www.mozilla.org/security/advisories/mfsa2025-55/ -

03 Jul 2025, 16:43

Type Values Removed Values Added
CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
First Time Mozilla
Mozilla firefox
References () https://bugzilla.mozilla.org/show_bug.cgi?id=1970658 - () https://bugzilla.mozilla.org/show_bug.cgi?id=1970658 - Permissions Required
References () https://www.mozilla.org/security/advisories/mfsa2025-51/ - () https://www.mozilla.org/security/advisories/mfsa2025-51/ - Vendor Advisory
References () https://www.mozilla.org/security/advisories/mfsa2025-53/ - () https://www.mozilla.org/security/advisories/mfsa2025-53/ - Vendor Advisory

25 Jun 2025, 15:15

Type Values Removed Values Added
CWE CWE-116
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 6.5
Summary
  • (es) Firefox podría haber analizado incorrectamente una URL y reescrito el dominio youtube.com al analizar la URL especificada en una etiqueta `embed`. Esto podría haber eludido las comprobaciones de seguridad del sitio web que restringían los dominios que los usuarios podían incrustar. Esta vulnerabilidad afecta a Firefox con versiones anteriores a 140 y Firefox con ESR inferior a 128.12.

24 Jun 2025, 13:15

Type Values Removed Values Added
New CVE
Information

Published : 2025-06-24 13:15

Updated : 2025-07-14 19:15

NVD link : CVE-2025-6429

Mitre link : CVE-2025-6429

CVE.ORG link : CVE-2025-6429

JSON object : View

Products Affected

mozilla

  • firefox
CWE
CWE-116

Improper Encoding or Escaping of Output