Cisco security advisory (AV26-978)

Serial Number: AV26-978Date: October 1, 2026 As of September 30, 2026, Cisco is affected by a vulnerability in the following product: Cisco Catalyst SD-WAN Manager Versions prior to 20.9.10.1, 20.12.8.2, 20.15.6.1, 20.18.4.1, 26.1.2.1 and 26.2.1 On September 30, 2026, Cybersecurity and Infrastructure Security Agency (CISA) added CVE-2026-76504 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 Catalyst SD-WAN Manager API Authentication Bypass Vulnerability Cisco Security Advisories CISA KEV: CVE-2026-76504