CVE-2026-20353 is listed by Cisco Secure Email Gateway and Secure Email and Web Manager Security Hardening Release: September 2026.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Oct 14, 2026 · Cisco Security Advisories

   Detected

   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. These vulnerabilities were found during internal testing.

Sources

• Cisco Security AdvisoriesVendor advisoryCVE-2026-20353

  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

  sec.cloudapps.cisco.com
• CVE.orgVulnerability recordCVE-2026-20353

  Official CVE identifier

  cve.org