CVE-2026-20126: Cisco Catalyst SD-WAN Manager

High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days.

A vulnerability in Cisco Catalyst SD-WAN Manager could allow an authenticated, local attacker with low privileges to gain root privileges on the underlying operating system. This vulnerability is due to an insufficient user authentication mechanism in the REST API. An attacker could exploit this vulnerability by sending a request to the REST API of the affected system. A successful exploit could allow the attacker to gain root privileges on the underlying operating system.

Affected products

• Cisco Catalyst SD-WAN Manager: before 20.9.8.2 (fixed in 20.9.8.2); from 20.11, 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 2026-02-25. Last modified 2026-06-17.