Secure Email Gateway

Cisco Secure Email Gateway Vulnerability: Patch Now

By Editorial Team | September 17, 2026

A critical Cisco Secure Email Gateway vulnerability lets one crafted email grant root access, no login needed. Active exploitation confirmed.

A critical Cisco Secure Email Gateway vulnerability, CVE-2026-76461 (CVSS 9.8), lets an attacker gain root access to the appliance by sending a single crafted email, no login or admin access required. Cisco confirmed active exploitation and published its advisory September 14; CISA added the flaw to its Known Exploited Vulnerabilities catalog the same day, and…