CVE-2026-76461
Published 2026-09-14 · Updated 2026-09-15 · Source psirt@cisco.com
Summary
CVE-2026-76461 is a critical-severity (CVSS 9.8) vulnerability in Cisco Secure Email Gateway. CISA added it to the Known Exploited Vulnerabilities catalog on September 14, 2026, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by September 17, 2026. CISA does not currently list it as used in ransomware campaigns. Cisco has 102 vulnerabilities in the KEV catalog, 7 of them linked to ransomware.
All 102 known-exploited Cisco vulnerabilities →Description
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.
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA Known-Exploited Vulnerability
Product: Cisco — Secure Email Gateway
Name: Cisco Secure Email Gateway SQL Injection Vulnerability
Date added: 2026-09-14 · Due: 2026-09-17
Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.