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VulnerabilityPublished Updated

CVE-2026-109782: Mitigation Bypass

Source GCVE Database

0
Authoritative record:CVE-2026-109782· High 8.3

Not known to be exploited · CVSS 8.3 High · fixed in 153.5 : patch Firefox soon.

Data as of 26 Oct 2026, 22:41 UTC

CVSS 3.1 base score
8.3High
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 153.5
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 13 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: 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 26 Oct 2026.

What to do

AI-suggested

This vulnerability is fixed in Firefox ESR 153.5. Users and administrators should update to Firefox ESR 153.5 or later to mitigate this issue. No additional mitigation actions are required beyond applying the official update.

Description

CVE-2026-109782 is a high-severity mitigation bypass vulnerability in the File Handling component of Firefox ESR. This flaw allows an attacker to bypass security mitigations, potentially leading to full compromise of confidentiality, integrity, and availability. The issue was fixed in Firefox ESR version 153.5.

References

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