CVE-2026-76519 Cisco Secure Email Gateway - Unrestricted File Upload

Cisco Secure Email Gateway contains an unrestricted file upload vulnerability caused by improper handling of email attachments in the Advanced Malware Protection feature, letting unauthenticated remote attackers write arbitrary files and execute commands with root privileges, exploit requires sending crafted email attachments.

CVSS base score 9.8 /10
Critical
CISA KEV
Exploited in the wild
Public exploit
Proof of concept available
Authentication
Not required
View the NVD record ↗

Details

Type
Unrestricted File Upload
Impact
Remote Code Execution, File System Write
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
14 October 2026
Updated
15 October 2026
Weakness
CWE-23

Vendor fix

Update to the latest version with the fix applied.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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