CVE-2026-74965
Shell Integration privilege escalation in Firefox and Thunderbird allowing local privilege gain.
Is CVE-2026-74965 being exploited?
Not confirmed. CVE-2026-74965 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 0.30% probability of exploitation in the next 30 days.
How severe is CVE-2026-74965?
CVE-2026-74965 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-2026-74965?
Yes. A fix has been recorded for CVE-2026-74965. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-74965 affect?
CVE-2026-74965 affects Firefox < 154, Firefox ESR < 140.14, Firefox ESR < 153.1, Thunderbird < 154, 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-2026-74965?
Upgrade to Firefox/Thunderbird 154 or ESR 140.14/153.1 immediately.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Local attackers or malicious local code can escalate privileges, potentially execute code with elevated rights and access restricted resources.
Patch when possible