CVE-2026-20108: Cisco Catalyst SD-WAN Manager

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

A vulnerability in the web-based management interface of Cisco Catalyst SD-WAN Manager could allow an authenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the interface of an affected device. This vulnerability is due to insufficient validation of user input. An attacker could exploit this vulnerability by persuading a user of the web-based management interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information.

Affected products

• Cisco Catalyst SD-WAN Manager: from 20.12, before 20.12.5.3 (fixed in 20.12.5.3); from 20.13, before 20.15.4.2 (fixed in 20.15.4.2); from 20.16, before 20.18.2.1 (fixed in 20.18.2.1); version 20.12.6 only

Published 2026-03-25. Last modified 2026-06-29.