Critical RCE/privilege escalation in widely deployed Cisco Secure Email Gateway; CISA KEV listing and root execution risk make this broadly impactful.
CVE-2026-76519
Unauthenticated path-traversal lets attackers write files and gain root on Cisco Secure Email Gateway
Is CVE-2026-76519 being exploited?
Yes. CVE-2026-76519 appears in CISA's Known Exploited Vulnerabilities catalog, which means exploitation in the wild has been confirmed and reported. Treat it as active rather than theoretical, and patch it ahead of higher-scoring vulnerabilities that carry no exploitation evidence.
How severe is CVE-2026-76519?
CVE-2026-76519 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-2026-76519?
Yes. A fix has been recorded for CVE-2026-76519. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-76519 affect?
CVE-2026-76519 affects Cisco Secure Email Gateway, Cisco Email Security Appliance (ESA), AMP file-reputation enabled deployments (on-prem/virtual/cloud). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-76519?
Apply Cisco advisory patches/mitigations immediately; follow CISA BOD 26-04.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated remote attacker can write arbitrary files and execute commands as root via crafted email attachments (remote code execution & full takeover).
Immediate action required
- affected14.0.0-698
- affected13.5.1-277
- affected13.0.0-392
- affected14.2.0-620
- affected13.0.5-007
- affected13.5.4-038
- affected14.2.1-020
- affected14.3.0-032
- affected15.0.0-104
- affected15.0.1-030
- affected15.5.0-048
- affected15.5.1-055
- affected15.5.2-018
- affected16.0.0-050
- affected15.0.3-002
- affected16.0.0-054
- affected15.5.3-022
- affected16.0.1-017
- affected15.5.4-012
- affected16.0.4-016
- affected15.0.5-016
- affected16.0.2-112
- affected16.0.3-044
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.