CVE-2026-74952
Local privilege escalation in Firefox/Thunderbird update component.
Is CVE-2026-74952 being exploited?
Not confirmed. CVE-2026-74952 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 0.23% probability of exploitation in the next 30 days.
How severe is CVE-2026-74952?
CVE-2026-74952 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-2026-74952?
Yes. A fix has been recorded for CVE-2026-74952. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-74952 affect?
CVE-2026-74952 affects Mozilla Firefox (<154), Mozilla Thunderbird (<154), Application Update component. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-74952?
Update to Firefox/Thunderbird 154+ immediately
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Local privilege escalation via the Application Update component allowing attackers to elevate privileges and execute code with higher rights.
Immediate action required