CVE-2025-11712
Unknown Unknown - Not Provided
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Publication date: 2025-10-14

Last updated on: 2026-04-13

Assigner: Mozilla Corporation

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.
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Meta Information
Published
2025-10-14
Last Modified
2026-04-13
Generated
2026-06-16
AI Q&A
2025-10-14
EPSS Evaluated
2026-06-15
NVD
CVE-2025-11712
Affected Vendors & Products
Showing 4 associated CPEs
Vendor Product Version / Range
mozilla thunderbird to 140.0 (inc)
mozilla thunderbird to 140.0 (inc)
mozilla firefox From 60.9.0 (exc)
mozilla firefox From 60.9.0 (exc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-116 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.
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Executive Summary

This vulnerability involves a malicious web page using the type attribute of an OBJECT tag to override the browser's default behavior when it encounters a web resource served without a content-type header. This can lead to cross-site scripting (XSS) attacks on sites that serve files without specifying a content-type, affecting certain versions of Firefox and Thunderbird.

Impact Analysis

The vulnerability can allow attackers to execute malicious scripts in the context of a trusted website, potentially leading to unauthorized actions, data theft, or session hijacking for users of affected Firefox and Thunderbird versions.

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