VulnerabilityPublished 10 Nov 2026

CVE-2026-124921: Sandbox Escape

Source GCVE Database

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Authoritative record:CVE-2026-124921· High

Not known to be exploited.

Data as of 10 Nov 2026, 17:33 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-38c6-26w4-qfc5

What to do

AI-suggested

This vulnerability has been fixed in Firefox 160. Users and administrators should update to Firefox 160 or later to ensure protection against this sandbox escape issue. No additional mitigation steps are required once the update is applied.

Description

CVE-2026-124921 is a sandbox escape vulnerability in the Graphics: WebGPU component of Firefox. This security flaw allows an attacker to break out of the browser's sandbox environment, potentially leading to unauthorized access or code execution outside the intended restricted context. The issue was addressed and fixed in Firefox version 160.

Impact

Successful exploitation of this vulnerability could allow an attacker to bypass Firefox's sandbox protections, potentially leading to arbitrary code execution or unauthorized access to system resources beyond the browser sandbox. This elevates the risk of system compromise and data exposure.

Summary

This vulnerability involves a sandbox escape in the Graphics: WebGPU component of Firefox. Sandbox escapes undermine the browser's security model by allowing malicious code to execute outside the confined environment, increasing the risk of system compromise. The flaw was identified and resolved by Mozilla in Firefox 160 as part of a broader security update addressing multiple high-impact vulnerabilities.

References

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