Cisco security advisory (AV26-1042) – Update 1

Serial number: AV26-1042Date: October 14, 2026 As of October 14, 2026, Cisco is affected by vulnerabilities in the following products: Cisco AsyncOS Software for Cisco Secure Email Gateway Release 15.5 version prior to 15.5.5-014 16.5 versions prior to 16.5.0-780 Cisco Secure Email and Web Manager Release 15.5 version prior to 15.5.5-006 16.5 versions prior to 16.5.0-429 Cisco has indicated that CVE-2026-76519 is being exploited in the wild. Update 1 On October 14, 2026, Cybersecurity and Infrastructure Security Agency (CISA) added CVE-2026-76519 to their Known Exploited Vulnerabilities (KEV) Database. The Cyber Centre encourages users and administrators to review the provided web links and apply any necessary updates as they become available. Cisco Secure Email Gateway Arbitrary File Write Vulnerability Cisco Secure Email Gateway and Secure Email and Web Manager Security Hardening Release: September 2026 Cisco Security Advisories CISA KEV: CVE-2026-76519