High-severity privilege escalation in widely deployed client software (Firefox/Thunderbird) that can impact many endpoints; fixed releases available and should be deployed broadly.
CVE-2026-92006
Canvas WebGL boundary bug in Firefox/Thunderbird enabling local privilege escalation.
Is CVE-2026-92006 being exploited?
Not confirmed. CVE-2026-92006 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.
How severe is CVE-2026-92006?
CVE-2026-92006 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-92006?
Yes. A fix has been recorded for CVE-2026-92006. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-92006 affect?
CVE-2026-92006 affects Mozilla Firefox < 156, Firefox ESR < 115.41, Firefox ESR < 140.16, Firefox ESR < 153.3, and 2 further products or versions. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-92006?
Update Firefox/Thunderbird to the listed fixed versions immediately.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Local privilege escalation via Graphics: CanvasWebGL boundary error allowing sandbox escape and elevation of privileges on affected hosts.
Immediate action required