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.

INFO

Published Date :

2025-06-24T12:28:00.819Z

Last Modified :

2026-04-13T14:30:42.931Z

Source :

mozilla
AFFECTED PRODUCTS

The following products are affected by CVE-2025-6429 vulnerability.

Vendors Products
Mozilla
  • Firefox
  • Firefox Esr
Redhat
  • Enterprise Linux
  • Rhel Aus
  • Rhel E4s
  • Rhel Els
  • Rhel Eus
  • Rhel Tus
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-6429.

URL Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=1970658 cve-icon cve-icon
https://lists.debian.org/debian-lts-announce/2025/06/msg00029.html cve-icon
https://lists.debian.org/debian-lts-announce/2025/07/msg00002.html cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-6429 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-6429 cve-icon
https://www.mozilla.org/security/advisories/mfsa2025-51/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2025-53/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2025-53/#CVE-2025-6429 cve-icon
https://www.mozilla.org/security/advisories/mfsa2025-54/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2025-55/ cve-icon cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
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Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact