CVE-2026-76504: Critical Cisco SD-WAN Manager Zero-Day Exploited in the Wild

Cisco has disclosed another actively exploited zero-day vulnerability affecting its Catalyst SD-WAN infrastructure. The latest flaw, tracked as CVE-2026-76504, is a critical authentication bypass in Cisco Catalyst SD-WAN Manager that could enable an unauthenticated remote attacker to gain administrative access to an affected system. The vulnerability carries a CVSS score of 9.8 , with Cisco confirming active exploitation in September 2026. Given the central role SD-WAN…