Widely used browser; critical RCE memory-corruption can compromise endpoints across organizations and requires urgent, broad mitigation.
CVE-2026-16411
Memory-corruption in Firefox 152 may allow remote code execution; fixed in Firefox 153.
Is CVE-2026-16411 being exploited?
Not confirmed. CVE-2026-16411 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 0.49% probability of exploitation in the next 30 days.
How severe is CVE-2026-16411?
CVE-2026-16411 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-2026-16411?
Yes. A fix has been recorded for CVE-2026-16411. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-16411 affect?
CVE-2026-16411 affects Mozilla Firefox 152 (Windows/macOS/Linux). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-16411?
Upgrade all Firefox instances to 153 immediately and restart browsers.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution via browser memory corruption; attackers can run arbitrary code, deploy malware, or steal data on affected hosts.
Immediate action required