Cisco Secure Email Gateway/Email & Web Manager are widely deployed enterprise appliances; a 9.8 RCE-class advisory affects many organizations and warrants broad IT/infosec distribution.
CVE-2026-76443
CWE-707 neutralization flaws in Cisco Secure Email Gateway and Web Manager.
Is CVE-2026-76443 being exploited?
Not confirmed. CVE-2026-76443 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 0.39% probability of exploitation in the next 30 days.
How severe is CVE-2026-76443?
CVE-2026-76443 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-2026-76443?
Yes. A fix has been recorded for CVE-2026-76443. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-76443 affect?
CVE-2026-76443 affects Cisco Secure Email Gateway (ESA), Cisco Secure Email and Web Manager (SEWM). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-76443?
Apply Cisco hardening updates immediately; isolate affected appliances until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Exploitation can enable remote code execution or command injection, leading to full compromise of affected email gateway appliances.
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
- affected13.6.2-023
- affected13.6.2-078
- affected13.0.0-249
- affected13.0.0-277
- affected13.8.1-052
- affected13.8.1-068
- affected13.8.1-074
- affected14.0.0-404
- affected12.8.1-002
- affected14.1.0-227
- affected13.6.1-201
- affected14.2.0-203
- affected14.2.0-212
- affected12.8.1-021
- affected13.8.1-108
- affected14.2.0-224
- affected14.3.0-120
- affected15.0.0-334
- affected15.5.1-024
- affected15.5.1-029
- affected15.5.2-005
- affected16.0.0-195
- affected15.5.3-017
- affected16.0.1-010
- affected15.0.1-035
- affected16.0.2-088
- affected15.5.4-007
- affected15.0.2-007
- affected16.0.4-010
- affected16.0.3-016
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.