Summaryinfo

A vulnerability labeled as problematic has been found in Cisco Catalyst SD-WAN Manager. Affected by this vulnerability is an unknown functionality of the component Web-based Management Interface. Executing a manipulation can lead to cross site scripting. This vulnerability appears as CVE-2026-20108. The attack may be performed from remote. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic was found in Cisco Catalyst SD-WAN Manager. This vulnerability affects an unknown part of the component Web-based Management Interface. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. CVE summarizes:

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.

The advisory is shared for download at sec.cloudapps.cisco.com. This vulnerability was named CVE-2026-20108 since 10/08/2025. The exploitation appears to be easy. The attack can be initiated remotely. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 03/31/2026). The MITRE ATT&CK project declares the attack technique as T1059.007.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-15437). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Network Management Software

Vendor

• Cisco

Name

• Catalyst SD-WAN Manager

Version

• 20.12.1
• 20.12.1_LI_Images
• 20.12.2
• 20.12.3
• 20.12.3.1
• 20.12.4
• 20.12.4.1
• 20.12.5
• 20.12.5.1
• 20.12.5.2
• 20.12.5.3
• 20.12.6
• 20.12.6.1
• 20.13.1
• 20.14.1
• 20.15.1
• 20.15.2
• 20.15.3
• 20.15.3.1
• 20.15.4
• 20.15.4.1
• 20.15.4.2
• 20.16.1
• 20.18.1

License

• commercial

Website

• Vendor: https://www.cisco.com/

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