CVE-2026-76519CiscoServers and softwareOctober 14, 2026

Cisco Secure Email Gateway Relative Path Traversal Vulnerability

Critical 9.8Actively exploited

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.

What to do

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.

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Details

Vendor
Cisco
Product
Cisco Secure Email Gateway
CVE
CVE-2026-76519
Affected versions
Cisco Secure Email 14.0: 14.0.0-698
Cisco Secure Email 13.5: 13.5.1-277; 13.5.4-038
Cisco Secure Email 13.0: 13.0.0-392; 13.0.5-007
Cisco Secure Email 14.2: 14.2.0-620; 14.2.1-020
Cisco Secure Email 14.3: 14.3.0-032
Cisco Secure Email 15.0: 4 versions, from 15.0.0-104 to 15.0.5-016
Cisco Secure Email 15.5: 5 versions, from 15.5.0-048 to 15.5.4-012
Cisco Secure Email 16.0: 6 versions, from 16.0.0-050 to 16.0.4-016 (from the advisory and NVD; check the exact builds in the official advisory)
CVSS score
9.8
Actively exploited
Yes, listed in the CISA Known Exploited Vulnerabilities catalog
CISA due date
October 17, 2026 (deadline for US federal agencies: a good benchmark for you too)
Source
CISA KEV – original advisory
Published
October 14, 2026

The description and the recommended action are quoted from the public advisory; severity, exploitation status and affected versions are compiled automatically from public sources and may contain errors. The vendor's original advisory prevails: check it before taking action. This information is provided without warranty and does not replace a professional assessment.

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