CVE-2025-11712CWE-116

CVE-2025-11712

Medium · published October 14, 2025

CVSS v3.1
6.1
EPSS
0%
Percentile
12.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.1 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00221 · 12.0th percentile
Weakness
CWE-116 · Improper Encoding or Escaping of Output
Published
2025-10-14T17:15Z
Affected products (4)
ProductVersionsFixed in
mozilla/firefox< 140.4.0140.4.0
mozilla/firefox< 144.0144.0
mozilla/thunderbird< 140.4.0140.4.0
mozilla/thunderbird≥ 141.0, < 144.0144.0
References (7)
https://bugzilla.mozilla.org/show_bug.cgi?id=1979536 · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-81/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-83/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-84/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-85/ · [email protected]https://lists.debian.org/debian-lts-announce/2025/10/msg00015.html · af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00031.html · af854a3a-2127-422b-91ae-364da2661108
EPSS history
Timeline
  • 14 OCT 12:27Z
    An OBJECT tag type attribute overrode browser behavior on web resources without a content-type
    cvelistv5