CVE-2026-76519

CRITICAL CVSS 3.1: 9.8 EPSS 1.74% ACTIVE EXPLOIT
Updated Oct 15, 2026
Cisco

CISA Known Exploited Vulnerability (KEV)

This vulnerability is actively exploited in the wild. Immediate patching is strongly recommended.

Due Date: Oct 17, 2026

Parameter Value
CVSS 9.8 (CRITICAL)
Type CWE-23 (Relative Path Traversal)
Vendor Cisco
Public PoC Yes

A vulnerability in the Advanced Malware Protection (AMP) feature of Cisco Secure Email Gateway could allow an unauthenticated, remote attacker to write arbitrary files on the underlying operating system. This vulnerability is due to improper handling of email attachments when the file reputation service is enabled. An attacker could exploit this vulnerability by sending an email that contains a crafted attachment through an affected device.

A successful exploit could allow the attacker to write arbitrary files and execute commands with root privileges on the underlying operating system.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v3.1

Vulnerable Products

cisco:cisco secure email