VulnerabilityPublished 10 Nov 2026

CVE-2026-124927: Mozilla Firefox · Site isolation issue in the Graphics: WebRender component

Affects Mozilla FirefoxSource CVE Database V5

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Not known to be exploited.

Data as of 10 Nov 2026, 13:48 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

Users and administrators should update Firefox to version 160 or later, or Firefox ESR 153.7 or later, to remediate this vulnerability. The vendor advisory confirms that the issue is fixed in these versions. No additional mitigation steps are indicated.

Description

CVE-2026-124927 is a site isolation vulnerability in the Graphics: WebRender component of Mozilla Firefox. This security issue was addressed and fixed in Firefox version 160 and Firefox ESR 153.7. The vulnerability could potentially impact the browser's graphics rendering isolation, but no specific exploitation details or active exploits are reported.

Impact

The vulnerability affects the isolation between sites in the WebRender graphics component, which could potentially allow unauthorized access or data leakage between different web origins. The vendor rates the impact as high, but no active exploitation has been observed.

Summary

This vulnerability concerns a site isolation issue within the WebRender component of Firefox's graphics subsystem. Site isolation is a security feature designed to separate web content from different origins into distinct processes to prevent data leakage or unauthorized access. The flaw was resolved in Firefox 160 and Firefox ESR 153.7, indicating that earlier versions are affected. No known exploits in the wild have been reported, and the vendor has classified the impact as high.

References

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Exploitation evidence

What to do

Description

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

Technical details

References

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