CVE-2026-76519

Cisco Secure Email Gateway Relative Path Traversal Vulnerability

CVSS: 9.8v3.1CriticalKEVReceived

Published 2026-10-14Last modified 2026-10-14

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Vulnerability summary

Overall risk

85/100

0100

Critical · default modelHow is this calculated?

CVSS score

9.8/10

010

Critical · v3.1 (cve.org)

EPSS score

Not scored

0%100%

No EPSS score yet

KEVListedCISA — 1 of 3 catalogs

RansomwareNone recordedNo known use recorded

Public exploits0No public exploits recorded

Timeline

2026-10-14
PublishedVulnerability first disclosed.
2026-10-14
Added to CISA KEVCisco Secure Email Gateway Relative Path Traversal Vulnerability
2026-10-14
Last modifiedVulnerability information updated.
2026-10-17
CISA remediation dueApply mitigations per vendor instructions.

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.

CVSS metrics

2 scores · 2 sources · 1 version

v3.19.8

EPSS trend

No EPSS score has been published for this record yet.

Known exploited

Compare KEV catalogs

CISA KEVListed

Added: 2026-10-14
Federal due date: 2026-10-17

CISA 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. sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-afw-zqYJkjxp nvd.nist.gov/vuln/detail/CVE-2026-76519

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

CWE-23Relative Path TraversalThe product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory.

Affected systems

Cisco1 product

cisco secure email14.0.0-698 | 13.5.1-277 | 13.0.0-392 | 14.2.0-620 | 13.0.5-007 | 13.5.4-038 | 14.2.1-020 | 14.3.0-032 | 15.0.0-104 | 15.0.1-030 | 15.5.0-048 | 15.5.1-055 | 15.5.2-018 | 16.0.0-050 | 15.0.3-002 | 16.0.0-054 | 15.5.3-022 | 16.0.1-017 | 15.5.4-012 | 16.0.4-016 | 15.0.5-016 | 16.0.2-112 | 16.0.3-044

1 vendor · 1 product

References

2 links