1Panel-dev MaxKB up to 2.7.x Public Chat Interface /ui/chat/ name/icon cross site scripting

Summaryinfo

A vulnerability labeled as problematic has been found in 1Panel-dev MaxKB up to 2.7.x. Affected is an unknown function of the file /ui/chat/ of the component Public Chat Interface. Such manipulation of the argument name/icon leads to cross site scripting. This vulnerability is referenced as CVE-2026-39422. It is possible to launch the attack remotely. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in 1Panel-dev MaxKB up to 2.7.x. It has been rated as problematic. Affected by this issue is an unknown part of the file /ui/chat/ of the component Public Chat Interface. The manipulation of the argument name/icon with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to 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. Impacted is integrity. CVE summarizes:

MaxKB is an open-source AI assistant for enterprise. Versions 2.7.1 and below contain a Stored Cross-Site Scripting (XSS) vulnerability through the application name or icon fields when creating an application. When a victim visits the public chat interface (/ui/chat/{access_token}), the ChatHeadersMiddleware retrieves the application data and directly inserts the unescaped application name and icon into the HTML response via string replacement. This allows an attacker to execute arbitrary JavaScript in the victim's browser context. This issue has been fixed in version 2.8.0.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-39422 since 04/07/2026. The exploitation is known to be easy. The attack may be launched remotely. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

Upgrading to version 2.8.0 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 026a2d623e2aa5efa67c4834651e79d5d7cab1da is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• 1Panel-dev

Name

• MaxKB

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7

License

• open-source

Website

• Product: https://github.com/1Panel-dev/MaxKB/

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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