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.
Metrics
Affected Vendors & Products
References
History
Fri, 17 Oct 2025 13:00:00 +0000
Type | Values Removed | Values Added |
---|---|---|
First Time appeared |
Mozilla
Mozilla firefox Mozilla thunderbird |
|
CPEs | cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* |
|
Vendors & Products |
Mozilla
Mozilla firefox Mozilla thunderbird |
Wed, 15 Oct 2025 14:15:00 +0000
Type | Values Removed | Values Added |
---|---|---|
Weaknesses | CWE-116 | |
Metrics |
ssvc
|
Wed, 15 Oct 2025 12:30:00 +0000
Type | Values Removed | Values Added |
---|---|---|
Title | thunderbird: firefox: An OBJECT tag type attribute overrode browser behavior on web resources without a content-type | |
Weaknesses | CWE-436 | |
References |
| |
Metrics |
threat_severity
|
cvssV3_1
|
Tue, 14 Oct 2025 13:00:00 +0000
Type | Values Removed | Values Added |
---|---|---|
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 affects Firefox < 144, Firefox ESR < 140.4, Thunderbird < 144, and Thunderbird < 140.4. | |
References |
|

Status: PUBLISHED
Assigner: mozilla
Published: 2025-10-14T12:27:35.544Z
Updated: 2025-10-15T13:28:24.592Z
Reserved: 2025-10-13T19:50:07.919Z
Link: CVE-2025-11712

Updated: 2025-10-15T13:21:56.248Z

Status : Analyzed
Published: 2025-10-14T13:15:37.447
Modified: 2025-10-17T12:52:15.430
Link: CVE-2025-11712
