VulnerabilityPublished 10 Nov 2026

CVE-2026-124923: Mozilla Firefox · Sandbox Escape in the Agent Component

Affects Mozilla FirefoxSource CVE Database V5

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Not known to be exploited.

Data as of 10 Nov 2026, 13:49 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.

What to do

AI-suggested

This vulnerability has been fixed in Firefox 160. Users and administrators should update to Firefox 160 or later to mitigate this issue. No additional action is required beyond applying the official update.

Description

CVE-2026-124923 is a sandbox escape vulnerability in the Agent component of Mozilla Firefox. This security flaw allows code running in a restricted sandbox environment to break out of those restrictions. The vulnerability was fixed in Firefox version 160. The impact of this vulnerability is considered high due to the potential for sandbox escape. No public exploit code or in-the-wild exploitation has been reported. Users are advised to update to Firefox 160 or later to remediate this issue.

Impact

The vulnerability enables sandbox escape, which can allow malicious code to execute outside the intended restricted environment, potentially leading to privilege escalation or unauthorized system access. The impact is rated high by the vendor. No active exploitation has been reported.

Summary

CVE-2026-124923 is a sandbox escape vulnerability affecting the Agent component in Mozilla Firefox. It was addressed and fixed in Firefox 160. The vulnerability allows an attacker to bypass sandbox restrictions, potentially leading to elevated privileges or unauthorized actions outside the sandbox environment. This issue is part of a broader set of high-impact vulnerabilities fixed in Firefox 160, as detailed in the Mozilla Foundation Security Advisory 2026-125. No public exploit code or confirmed exploitation in the wild is known at this time.

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Exploitation evidence

What to do

Description

AI analysisMachine-generated, updated 10 Nov 2026, 13:48 UTC

Technical details

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