CVE-2026-76461: Cisco Secure Email Gateway SQL Injection Vulnerability

Critical severity, CVSS 9.8. Actively exploited: in CISA KEV since 2026-09-14. EPSS: 28.3% chance of exploitation in the next 30 days.

A vulnerability in the email parsing of Cisco AsyncOS Software for Cisco Secure Email Gateway could allow an unauthenticated, remote attacker to execute arbitrary commands with root privileges on the underlying operating system. This vulnerability is due to insufficient validation in the email parsing logic. An attacker could exploit this vulnerability by sending a crafted email message that contains malicious SQL statements through an affected device. A successful exploit could allow the attacker to execute arbitrary SQL statements, leading to command execution with root privileges on the underlying operating system.

Affected products

• Cisco Asyncos: before 15.5.5-014 (fixed in 15.5.5-014); from 16.0, before 16.0.4-302 (fixed in 16.0.4-302); from 16.5, before 16.5.0-780 (fixed in 16.5.0-780)

Published 2026-09-14. Last modified 2026-09-15.