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Cisco Enterprise Chat and Email CVE-2026-20172

| EUVD-2026-27856 MEDIUM
Reliance on File Name or Extension of Externally-Supplied File (CWE-646)
2026-05-06 cisco GHSA-rx97-pwc5-6v32
Cisco File Upload
4.3
CVSS 3.1
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CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

Lifecycle Timeline

1
Analysis Generated
May 06, 2026 - 17:34 vuln.today

DescriptionNVD

A vulnerability in the Lite Agent feature of Cisco Enterprise Chat and Email (ECE) could allow an authenticated, remote attacker to conduct browser-based attacks. To exploit this vulnerability, the attacker must have valid credentials for a user account with at least the role of Agent.

This vulnerability is due to inadequate validation of file contents during file upload operations. An attacker could exploit this vulnerability by uploading a file that contains malicious scripts or HTML code, which the application could make available to other users to access. A successful exploit could allow the attacker to execute the contents of that file in the browser of a user and conduct browser-based attacks. 

AnalysisAI

Cisco Enterprise Chat and Email (ECE) Lite Agent feature allows authenticated remote attackers with Agent role credentials to upload files containing malicious scripts or HTML, which are then served to other users without adequate content validation. Successful exploitation enables stored cross-site scripting (XSS) attacks in victim browsers. …

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CVE-2026-20172 vulnerability details – vuln.today
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