CVE-2025-11712

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 affects Firefox < 144, Firefox ESR < 140.4, Thunderbird < 144, and Thunderbird < 140.4.

CVSS v3 6.1 MEDIUM

6.1^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=1979536	Issue Tracking Permissions Required
https://www.mozilla.org/security/advisories/mfsa2025-81/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-83/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-84/	Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-85/	Vendor Advisory
https://lists.debian.org/debian-lts-announce/2025/10/msg00015.html
https://lists.debian.org/debian-lts-announce/2025/10/msg00031.html

Configurations

Configuration 1 (hide)

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

History

03 Nov 2025, 18:15

Type	Values Removed	Values Added
References		() https://lists.debian.org/debian-lts-announce/2025/10/msg00015.html - () https://lists.debian.org/debian-lts-announce/2025/10/msg00031.html -

Information

Published : 2025-10-14 13:15

Updated : 2025-11-03 18:15

NVD link : CVE-2025-11712

Mitre link : CVE-2025-11712

CVE.ORG link : CVE-2025-11712

JSON object : View

Products Affected

mozilla

thunderbird
firefox

CWE

CWE-116

Improper Encoding or Escaping of Output

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