CVE-2026-16360
Memory corruption in Thunderbird enabling remote arbitrary code execution.
Is CVE-2026-16360 being exploited?
Not confirmed. CVE-2026-16360 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 0.47% probability of exploitation in the next 30 days.
How severe is CVE-2026-16360?
CVE-2026-16360 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-2026-16360?
Yes. A fix has been recorded for CVE-2026-16360. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-16360 affect?
CVE-2026-16360 affects Mozilla Thunderbird ESR 140.12, Mozilla Thunderbird 152, Related Firefox components (patched in Firefox 153/ESR 140.13). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-16360?
Update Thunderbird to 140.13 or 153 immediately and verify rollout.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution via crafted email/content causing memory corruption; attacker can run arbitrary code and fully compromise the host.
Immediate action required