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

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2026-09-14
• EPSS: 29.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-14 · updated 2026-09-15
• Weakness: CWE-89

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.

Affected products

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

How to fix

Upgrade to a fixed version: Cisco Asyncos 15.5.5-014, 16.0.4-302, 16.5.0-780. Check the vendor advisory for mitigations.

In the news

• Cisco Secure Email Gateway SQL Injection Vulnerability

References

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-inj-2bLVGmhX
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-76461

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