Cisco Secure Email Gateway 0-Day Vulnerability Actively Exploited in Attacks

Cisco Secure Email Gateway is being actively exploited via a critical zero-day vulnerability (CVE-2026-76519, CVSS 9.8) that grants root access through malicious email attachments without authentication. Attackers have been actively exploiting this flaw since October 2026, posing immediate risk to email security infrastructure.

https://cybersecuritynews.com/cisco-secure-email-gateway-0-day-vulnerability/