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VulnerabilityPublished Updated

CVE-2026-109780: Mitigation Bypass

Source GCVE Database

0
Authoritative record:CVE-2026-109780· Critical 9.8

Not known to be exploited · CVSS 9.8 Critical.

Data as of 26 Oct 2026, 22:42 UTC

CVSS 3.1 base score
9.8Critical
How severe the flaw is on the 0–10 CVSS scale.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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

Users should update to Firefox version 158 or later, where this vulnerability has been fixed. No additional mitigation actions are required beyond applying the official update.

Description

CVE-2026-109780 is a critical mitigation bypass vulnerability in the DOM: Core & HTML component of Firefox. This flaw allows attackers to bypass security mitigations, potentially leading to full compromise of confidentiality, integrity, and availability. The issue was fixed in Firefox version 158.

References

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