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CVE-2025-6429

nvd nist
Published: Jun 24, 2025Modified: Apr 13, 2026

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6.5
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Exploitability: 2.8 / Impact: 3.6
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

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 (2)

Products: Mozilla: Firefox
Mozilla
1 product
Firefox
Configuration A
2 vulnerable
Vulnerable SoftwareAffected Versions
Mozilla
Firefox
Before 140.0
Firefox
Before 128.12.0

Related CWEs

CWE-116
Improper Encoding or Escaping of Output
The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.

References (7)

Source: security@mozilla.org
Permissions Required
Source: security@mozilla.org
Vendor Advisory
Source: security@mozilla.org
Vendor Advisory
Source: security@mozilla.org
Source: security@mozilla.org
Source: af854a3a-2127-422b-91ae-364da2661108
Source: af854a3a-2127-422b-91ae-364da2661108

Timeline

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