Critical Zero-Day Vulnerability CVE-2026-76461 in Cisco Secure Email Gateway Under Active Exploitation

A zero-day vulnerability tracked as CVE-2026-76461 in Cisco Secure Email Gateway is currently under active exploitation. The vulnerability allows an unauthenticated attacker to execute arbitrary commands on the underlying operating system with root privileges, representing a remote code execution flaw. The security issue affects Cisco's Secure Email Gateway product and requires no authentication to exploit.