CVE-2026-20108 Cross-site scripting in Cisco Catalyst SD-WAN Manager

Medium 5.4 Published 25 Mar 2026 Updated 27 Mar 2026

An authenticated attacker can execute arbitrary scripts or access sensitive data by tricking a user into clicking a crafted link in the Cisco Catalyst SD-WAN Manager interface.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2026-20108?

CVE-2026-20108 is a medium-severity cross-site scripting vulnerability in Cisco Catalyst Sd-Wan Manager, published on 25 Mar 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

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.

Weakness: CWE-79

Which versions are affected by CVE-2026-20108?

It affects 1 product.

Products include Cisco Catalyst Sd-Wan Manager.

How do I fix CVE-2026-20108?

No fix has been published for CVE-2026-20108 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2026-20108 being exploited?

There is no known exploitation of CVE-2026-20108 in the wild and no public exploit code.

All Cisco Catalyst Sd-Wan Manager vulnerabilities

Sources

Also known as GHSA-4wfv-hq2x-7m5r.