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

Patch now

CRITICAL 9.8EXPLOITEDREMOTEUPGRADE

CVE-2026-76461 is a critical-severity flaw (CVSS 9.8) affecting asyncos, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 affecte

Why this priority

Critical severity
EPSS top 2%: very likely to be exploited
Exploited in the wild (CISA KEV)
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	29.5% (top 2%)
CISA exploited list	Yes, fix due 2026-09-17
Weakness	CWE-89
Published	2026-09-14
Last modified	2026-09-15

Publisher (CNA): Cisco Systems, Inc. · Vendor: cisco

Am I affected?

Timeline

2026-09-14Exploited Added to the CISA Known Exploited Vulnerabilities list
2026-09-14 17:17 UTCPublished CVE record published
2026-09-15 12:47 UTCUpdated Record last modified
2026-09-17Deadline CISA due date for US federal agencies to patch

cisco asyncos UPGRADE

Affected: < 15.5.5-014 · >= 16.0 and < 16.0.4-302 · >= 16.5 and < 16.5.0-780

Fixed in: 15.5.5-014, 16.0.4-302, 16.5.0-780

Safe to downgrade to: a release before 16.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Exact fixes by distribution

Fedora 46 · uv · FIXED · 0.13.5-1.fc46 · FEDORA-2026-61ea5a28c6 · source

sudo dnf upgrade --advisory=FEDORA-2026-61ea5a28c6

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: 0xBlackash/CVE-2026-76461 (2 stars)
GitHub PoC: S3v3n-JG/CVE-2026-76461 (1 stars)
GitHub PoC: HORKimhab/CVE-2026-76461 (0 stars)

Advisories and coverage

Official advisories

Cisco Security Advisories: Cisco Secure Email Gateway SQL Injection Vulnerability 2026-09-17

Verify at the official source NVD · CVE Program · CISA KEV catalog · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Related CVEs

CVE-2026-76519 CRITICAL 9.8 EXPLOITED UPGRADE Cisco Secure Email Gateway Relative Path Traversal Vulnerability

References

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