CVE-2026-76461: Cisco Secure Email Gateway SQL Injection Vulnerability
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.
Key takeaways
- CVE-2026-76461 has CVSS 3.1 9.8 (CRITICAL).
- CISA lists it as actively exploited (added 2026-09-14).
- EPSS estimates a 28.3% probability of exploitation in the next 30 days.
- 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…
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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.
At a glance
Item | Value |
|---|---|
CVE | CVE-2026-76461 |
CVSS 3.1 | 9.8 (CRITICAL) |
Vector |
|
Weakness | CWE-89 |
Affected | Cisco Secure Email Gateway |
EPSS | 28.3% probability of exploitation in the next 30 days (98.1th percentile, 2026-10-08) |
Known exploited (CISA KEV) | Yes, added 2026-09-14; US federal remediation due 2026-09-17 |
NVD status | Analyzed |
Published | 2026-09-14 |
Last modified | 2026-09-15 |
What to do
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.
Apply the vendor fix or mitigation:
Prioritise by exposure: internet-facing and unauthenticated attack paths first.
Analysis
Questions and answers
Is CVE-2026-76461 being actively exploited?
Yes. CISA added CVE-2026-76461 to its Known Exploited Vulnerabilities catalogue on 2026-09-14.
How severe is CVE-2026-76461?
NVD rates it 9.8 (CRITICAL) under CVSS 3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What should I do about CVE-2026-76461?
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.
Discussion