CVE-2026-20126 Cisco Catalyst SD-WAN Manager Privilege Escalation Vulnerability

High 8.8 Published 25 Feb 2026 Updated 20 Mar 2026

An authenticated local attacker can exploit insufficient REST API authentication to gain root privileges on the underlying operating system.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-20126?

CVE-2026-20126 is a high-severity vulnerability in Cisco Catalyst Sd-Wan Manager, published on 25 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

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.

Weakness: CWE-648

Which versions are affected by CVE-2026-20126?

It affects 1 product.

Products include Cisco Catalyst Sd-Wan Manager.

How do I fix CVE-2026-20126?

No fix has been published for CVE-2026-20126 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-20126 being exploited?

There is no known exploitation of CVE-2026-20126 in the wild and no public exploit code.

All Cisco Catalyst Sd-Wan Manager vulnerabilities

Sources

Also known as GHSA-mjw4-rp5q-2h7w.