CVE-2025-11712
6.1
MEDIUM
CVSS 3.1
EPSS 0.04%
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.
How to fix CVE-2025-11712
To remediate CVE-2025-11712, upgrade the affected package to a fixed version below.
- —upgrade to 140.4.0esr-1~deb11u1 or later
- —upgrade to 1:140.4.0esr-1~deb11u1 or later
Is CVE-2025-11712 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 140.4.0esr-1~deb11u1
- from 0, < 1:140.4.0esr-1~deb11u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |