CVE-2026-76519
Cisco Secure Email Gateway Arbitrary File Write Vulnerability
Cisco Secure Email Gateway Relative Path Traversal Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.
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.
CISA 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
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.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitation Context
as of October 15, 2026- CISA added CVE-2026-76519 to the KEV catalog on the day its CVE record was published. The median for entries added in 2026 so far is 14 days.
- It is one of 101 Cisco entries in the CISA KEV catalog, and one of 19 added in 2026.
Affected Products
| Vendor | Product | Affected versions |
|---|---|---|
| Cisco | Cisco Cisco Secure Email | 14.0.0-698 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 |
References
1 LinksRecord Details
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