CVE WatchOct 14, 2026

CVE-2026-76519

Cisco Secure Email Gateway Relative Path Traversal Vulnerability

CVSS

9.8

Critical

EPSS

—

KEV

YES

Oct 14, 2026

Exploit Today

0-100

Published: Oct 14, 2026 · Last modified: Oct 14, 2026 · CWE-23

EPSS · 30d

Not enough EPSS history yet.

KEV catalog record

Product

Cisco / Secure Email Gateway

Vulnerability

Cisco Secure Email Gateway Relative Path Traversal Vulnerability

Added to KEV

Oct 14, 2026

Remediate by

Oct 17, 2026

Known ransomware use

Summary description

Cisco Secure Email Gateway contains a relative path traversal vulnerability that could allow an unauthenticated, remote attacker to write arbitrary files on the underlying operating system.

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.

Notes

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-afw-zqYJkjxp ; ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-76519

Technical 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.

Official references

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