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CVE

CVE-2025-11712

A malicious page could have used the type attribute of an OBJECT tag to override the default browser behavior when encou

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.

MEDIUM · CVSS 6.1 EPSS 0.00043
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules1 YARA rules0
⬡

Weakness Classification

CWE-116Improper Encoding or Escaping of Output
▤

Affected Products & Versions

4
mozilla firefox< 140.4.0
mozilla firefox< 144.0
mozilla thunderbird< 140.4.0
mozilla thunderbird>= 141.0 and < 144.0
◈

Sigma Hunt Rules

1
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
producthighSQLite Firefox Profile Data DB Access
▣

Scoring & Timeline

6.1
MEDIUM · CVSS v3.1 · security@mozilla.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD14 Oct 2025 · 01:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

30
usnUSN-7991-1
suse-csafSUSE-SU-2025:4173-1
suse-csafSUSE-SU-2025:4174-1
suse-csafopenSUSE-SU-2025:20065-1
suse-csafSUSE-SU-2025:21021-1
🔗

References & Sources

7
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://bugzilla.mozilla.org/show_bug.cgi?id=1979536Issue TrackingPermissions 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
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