CVE-2025-11712A 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.
Updated under an hour ago ()
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It affects mozilla firefox and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 6.1 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- Weakness (CWE)
- CWE-116
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Modified
- Record last updated
- Oct 18, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
mozilla firefox mozilla:firefox | before 140.4.0; before 144.0 | NVD |
mozilla thunderbird mozilla:thunderbird | before 140.4.0; from 141.0 before 144.0 | NVD |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1979536issue-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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.