CVE-2026-76461: Cisco Secure Email Gateway

What is CVE-2026-76461?

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.

CVSS9.8 NVD 3.1

SeverityCRITICAL

Exploitation In the wild In CISA KEV

EPSS28% · P98

Triage statusActive Exploit

ActionPatch immediately

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWECWE-89

NVD published2026-09-14

NVD last modified2026-09-15

Timeline

2026-09-14Published to the U.S. National Vulnerability Database (NVD)
2026-09-14Added to the CISA Known Exploited Vulnerabilities (KEV) catalog
2026-09-15NVD record last updated
2026-09-16First covered in a defend.network daily briefing
2026-09-17CISA federal remediation deadline (BOD 22-01)

CISA Known Exploited Vulnerability

Cisco Secure Email Gateway SQL Injection Vulnerability

Added to KEV2026-09-14

Federal patch deadline2026-09-17

Known ransomware useUnknown

Affected product

Cisco Secure Email Gateway

NVD also lists CPE entries for: Cisco Asyncos, Cisco Secure Email Gateway Virtual Appliance C100v, Cisco Secure Email Gateway Virtual Appliance C300v, Cisco Secure Email Gateway Virtual Appliance C600v, Cisco Secure Email Gateway C195

Remediation Steps

Apply the vendor security update for Cisco Asyncos as a priority.
Restrict network exposure of the affected service to trusted sources until patched.
Review logs and detections for indicators of exploitation.
Confirm fixed versions against the official vendor advisory before deploying.

References

Referenced in our briefings & reports

Vulnerability Priority Report – Week 1 of October 2026 (October 5 – 11)
Vulnerability Priority Report – Week 4 of September 2026 (September 28 – October 4)
Vulnerability Priority Report – Week 3 of September 2026 (September 21 – 27)
Vulnerability Priority Report – Week 2 of September 2026 (September 14 – 20)
Issabel RCE under active exploitation; Microsoft patches 974 CVEs; browser AI assistants hijacked (2026-09-17)
Cisco SEG SQL injection joins KEV; Acronis Linux flaw exploited; banking malware targets browsers (2026-09-16)

Browse all tracked CVEs in the defend.network CVE database →

🤖 This CVE page is generated by defend.network from NVD, CISA KEV, EPSS, and our verified daily briefings. Severity and exploitation data come from official sources; always verify remediation steps against the official vendor advisory before acting in production.