VulnerabilityPublished 10 Nov 2026

CVE-2026-124855: Sandbox Escape

Source GCVE Database

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Authoritative record:CVE-2026-124855· High

Not known to be exploited.

Data as of 10 Nov 2026, 18:03 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-pwfq-x2jh-29cm

What to do

AI-suggested

A fix for this vulnerability is available and was released in Firefox 160 and Firefox ESR 153.7. Users and administrators should update to these versions or later to mitigate the risk. No additional mitigation steps are required beyond applying the official update.

Description

CVE-2026-124855 is a sandbox escape vulnerability in the DOM Navigation component of Firefox. This flaw could allow an attacker to break out of the browser's sandbox environment, potentially leading to unauthorized actions or code execution. The vulnerability was fixed in Firefox version 160 and Firefox ESR 153.7. The impact is rated high by the vendor. No known exploits in the wild have been reported.

Impact

The vulnerability enables sandbox escape, which can undermine the security boundary that isolates web content from the underlying system. This could lead to privilege escalation or unauthorized code execution outside the browser sandbox. Mozilla rates the impact as high, indicating serious security implications if exploited.

Summary

This vulnerability involves a sandbox escape in the DOM Navigation component of Firefox, identified as CVE-2026-124855. It was reported by Tran Quac and assigned a high impact severity by Mozilla. The flaw allows bypassing the sandbox protections, which are critical for isolating web content and preventing malicious code from affecting the host system. Mozilla fixed this issue in Firefox 160 and Firefox ESR 153.7 as part of a security update addressing multiple high-impact vulnerabilities.

References

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