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CVE-2025-11712

nvd nist
Published: Oct 14, 2025Modified: Apr 13, 2026

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6.1
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Exploitability: 2.8 / Impact: 2.7
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Description

A malicious page could have used the type attribute of an OBJECT tag to override the default browser behavior when encountering a web resource served without a content-type. This could have contributed to an XSS on a site that unsafely serves files without a content-type header. This vulnerability was fixed in Firefox 144, Firefox ESR 140.4, Thunderbird 144, and Thunderbird 140.4.

Affected (4)

Mozilla
2 products
Firefox
Thunderbird
Configuration A
4 vulnerable
Vulnerable SoftwareAffected Versions
Mozilla
Firefox
Before 144.0
Firefox
Before 140.4.0
Mozilla
Thunderbird
Before 140.4.0
Thunderbird
From 141.0 to 144.0

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

Timeline

No history available yet.