Main Vulnerability Database Vulnerabilities #VU149714

Improper control of a resource through its lifetime in Cisco Secure Email and Web Manager and Secure Email Gateway - CVE-2026-20353

Published: September 14, 2026

Vulnerability identifier: #VU149714

CSH Severity: High

CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-20353

CWE-ID: CWE-664

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to improper control of a resource through its lifetime in Cisco Secure Email Gateway and Cisco Secure Email and Web Manager when processing input. A remote attacker can bypass implemented security restrictions and compromise the affected system.

Affected software

Cisco Secure Email and Web Manager
Secure Email Gateway

How to mitigate CVE-2026-20353

Install security update from vendor's website.

Cisco Secure Email and Web Manager - addressed in versions 15.5.5-006, 16.5.0-429
Secure Email Gateway - addressed in versions 15.5.5-014, 16.5.0-780

External References

Related Security Bulletins