What is CVE-2026-76440?

CVE-2026-76440 is a critical-severity vulnerability in Cisco Secure Email, classified under Relative Path Traversal. CVSS score: 9.8/10. Published 2026-09-14.

How severe is CVE-2026-76440?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Path Traversal in Cisco Secure Email

CVE-2026-76440

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Email Gateway and Cisco Secure Email and Web Manager engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-76440 are related to path traversal issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-23.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Cisco Secure Email — versions 13.0.0-392, 13.0.5-007, 13.5.1-277
Cisco Secure Email And Web Manager — versions 12.8.1-002, 12.8.1-021, 13.0.0-249

Weakness classification (CWE)

CWE-23 — Relative Path Traversal

References

Frequently asked questions

What is CVE-2026-76440?: CVE-2026-76440 is a critical-severity vulnerability in Cisco Secure Email, classified under Relative Path Traversal. CVSS score: 9.8/10. Published 2026-09-14.
How severe is CVE-2026-76440?: Critical severity. CVSS v3 base score is 9.8 out of 10.