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6.1 Medium

CVE-2025-11712 A malicious page could have used the type attribute of an OBJECT tag to override the default browser behavior when…

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 products and versions

Product Affected versions Fixed in
Firefox 144 earliest → < 144 144
Firefox 140.4 earliest → < 140.4 140.4
Firefox ESR 140.4 earliest → < 140.4 140.4
Thunderbird 144 earliest → < 144 144
Thunderbird 140.4 earliest → < 140.4 140.4

References

Timeline

  1. Published
  2. Last modified

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