Cisco Secure Email Gateway up to 16.0.4-016 Advanced Malware Protection file inclusion

Summaryinfo

A vulnerability was found in Cisco Secure Email Gateway. It has been rated as very critical. Affected by this issue is some unknown functionality of the component Advanced Malware Protection. This manipulation causes file inclusion. This vulnerability is handled as CVE-2026-76519. The attack can be initiated remotely. Additionally, an exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Cisco Secure Email Gateway. It has been declared as very critical. Affected by this vulnerability is an unknown function of the component Advanced Malware Protection. The manipulation with an unknown input leads to a file inclusion vulnerability. The CWE definition for the vulnerability is CWE-73. The product allows user input to control or influence paths or file names that are used in filesystem operations. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at sec.cloudapps.cisco.com. This vulnerability is known as CVE-2026-76519 since 08/19/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are unknown but an exploit is available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/14/2026).

It is declared as attacked. The CISA Known Exploited Vulnerabilities Catalog lists this issue since 10/14/2026 with a due date of 10/17/2026:

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 BO

Upgrading eliminates this vulnerability.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• Cisco

Name

• Secure Email Gateway

Version

• 13.0.0-392
• 13.0.5-007
• 13.5.1-277
• 13.5.4-038
• 14.0.0-698
• 14.2.0-620
• 14.2.1-020
• 14.3.0-032
• 15.0.0-104
• 15.0.1-030
• 15.0.3-002
• 15.0.5-016
• 15.5.0-048
• 15.5.1-055
• 15.5.2-018
• 15.5.3-022
• 15.5.4-012
• 16.0.0-050
• 16.0.0-054
• 16.0.1-017
• 16.0.2-112
• 16.0.3-044
• 16.0.4-016

License

• commercial

Website

• Vendor: https://www.cisco.com/

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