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VulnerabilityPublished Updated

CVE-2026-109763: Mitigation Bypass

Source GCVE Database

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Authoritative record:CVE-2026-109763· Medium 5.4

Not known to be exploited · CVSS 5.4 Medium.

Data as of 31 Oct 2026, 00:06 UTC

CVSS 3.1 base score
5.4Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CISA-ADPCVSS 3.15.4
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 13 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

AI-suggested

Users and administrators should update Firefox to version 158 or later, or Firefox ESR 153.5 or later, to remediate this vulnerability. The vendor advisory confirms that the issue is fixed in these versions. No additional mitigation actions are required beyond applying the official update.

Description

CVE-2026-109763 is a mitigation bypass vulnerability in the File Handling component of Firefox. This issue was addressed and fixed in Firefox version 158 and Firefox ESR 153.5. The vulnerability has a medium severity rating with a CVSS score of 5.4, indicating limited impact on confidentiality and integrity, and no impact on availability. No known exploits in the wild have been reported.

References

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