CVE-2026-20172: Cisco Enterprise Chat And Email

Medium severity, CVSS 4.3. EPSS: 0.1% chance of exploitation in the next 30 days.

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. 

Affected products

• Cisco Cisco Enterprise Chat And Email: version 11.6(1)_ES3 only; version 11.6(1)_ES4 only; version 12.0(1)_ES6 only; version 11.6(1)_ES8 only; version 12.0(1)_ES5a only; version 11.6(1)_ES9 only; …

Published 2026-05-06. Last modified 2026-06-17.