CVE-2026-74985
Privilege escalation in Firefox/Thunderbird Enterprise Policies component
Is CVE-2026-74985 being exploited?
Not confirmed. CVE-2026-74985 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. EPSS currently estimates a 0.31% probability of exploitation in the next 30 days.
How severe is CVE-2026-74985?
CVE-2026-74985 is rated Critical with a CVSS score of 9.8. 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-2026-74985?
Yes. A fix has been recorded for CVE-2026-74985. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-74985 affect?
CVE-2026-74985 affects Firefox 154, Firefox ESR 153.1, Thunderbird 154, Thunderbird 153.1. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-74985?
Update affected Firefox/Thunderbird to the fixed versions immediately
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Local privilege escalation allowing attackers to elevate a user context to higher OS privileges and bypass managed policies.
Immediate action required