VulnerabilityPublished 10 Nov 2026

CVE-2026-124940: Mitigation Bypass

Source GCVE Database

Compare

Authoritative record:CVE-2026-124940· High

Not known to be exploited.

Data as of 10 Nov 2026, 17:32 UTC

Severity

High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Exploitation evidence

Disclosed: evidence found.
CVE published 10 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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 10 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-3mfx-g38v-95fm

What to do

AI-suggested

Users should update to Firefox 160 or later, or Firefox ESR 153.7 or later, to remediate this vulnerability. The vendor has provided an official fix, and applying these updates fully mitigates the risk.

Description

CVE-2026-124940 is a mitigation bypass vulnerability in the File Handling component of Firefox. This security flaw was addressed and fixed in Firefox version 160 and Firefox ESR 153.7. The vulnerability could allow attackers to bypass security mitigations related to file handling, potentially leading to security risks. No active exploitation in the wild has been reported. The vendor has released an official fix.

Impact

The vulnerability could allow an attacker to bypass security mitigations related to file handling in Firefox, which may lead to unauthorized actions or compromise of the browser's security model. The impact is rated high by the vendor. There are no reports of exploitation in the wild.

Summary

This vulnerability involves a mitigation bypass in the File Handling component of Firefox. It was resolved by Mozilla in Firefox 160 and Firefox ESR 153.7. The issue was disclosed as part of a batch of high-impact security fixes announced on November 10, 2026. The vendor advisory confirms the fix and categorizes the impact as high. No further technical details about the exact nature of the bypass or exploitation methods are provided in the advisory.

References

Community reviews

Loading reviews…