9.8 Critical Exploited

CVE-2026-76519 Cisco Secure Email Gateway Relative Path Traversal Vulnerability

Active exploitation observed

· CISA KEV catalogue

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 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.

Ransomware campaigns Not observed so far

Weakness CWE-23

Description

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.

Affected products and versions

Product	Affected versions	Fixed in
Cisco Secure Email 16.0	16.0.0-050 → 16.0.4-016	No fix stated
Cisco Secure Email 15.5	15.5.0-048 → 15.5.4-012	No fix stated
Cisco Secure Email 15.0	15.0.0-104 → 15.0.5-016	No fix stated
Cisco Secure Email	14.3.0-032	No fix stated
Cisco Secure Email 14.2	14.2.0-620 → 14.2.1-020	No fix stated
Cisco Secure Email	14.0.0-698	No fix stated
Cisco Secure Email 13.5	13.5.1-277 → 13.5.4-038	No fix stated
Cisco Secure Email 13.0	13.0.0-392 → 13.0.5-007	No fix stated