Critical [CVE-2026-76461] Cisco Secure Email Gateway SQL Injection Vulnerability
This critical-severity Cisco advisory covers CVE-2026-76461 affecting Secure Email.
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Summary
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.
Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.
CISA Known Exploited Vulnerability
- Listed:
- Sep 14, 2026 · federal remediation due Sep 17, 2026
- 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.
KEV is a prioritization signal from CISA. Remediation detail comes from the vendor advisory.
- Scope: This vulnerability affects Cisco Secure Email Gateway, both physical and virtual, regardless of device configuration.
- Release 15.5 and earlier (first fixed: 15.5.5-014)
- Release 16.0 (first fixed: 16.0.4-302)
- Release 16.5 (first fixed: 16.5.0-780)
Official advisory · high-confidence parse· fetched 10 days ago·verify at source
- 15.5.5-014
- 16.0.4-302
- 16.5.0-780
Official advisory · high-confidence parse· fetched 10 days ago·verify at source
Mitigation checklist
- Upgrade to the first fixed release for your train per the Fixed Releases table in this advisory.
- Release 15.5 and earlier: upgrade to 15.5.5-014.
- Release 16.0: upgrade to 16.0.4-302.
- Release 16.5: upgrade to 16.5.0-780.
- There are no workarounds that address this vulnerability.
Official advisory · high-confidence parse· fetched 10 days ago·verify at source
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