1Panel-dev MaxKB up to 2.7.x Chatbot Interface /admin/api/workspace/ prologue cross site scripting

Summaryinfo

A vulnerability was found in 1Panel-dev MaxKB up to 2.7.x. It has been declared as problematic. The affected element is an unknown function of the file /admin/api/workspace/ of the component Chatbot Interface. Executing a manipulation of the argument prologue can lead to cross site scripting. This vulnerability is handled as CVE-2026-39425. The attack can be executed remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in 1Panel-dev MaxKB up to 2.7.x and classified as problematic. This vulnerability affects some unknown processing of the file /admin/api/workspace/ of the component Chatbot Interface. The manipulation of the argument prologue with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-80. The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as "<", ">", and "&" that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages. As an impact it is known to affect 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 that allows authenticated users to inject arbitrary HTML and JavaScript into the Application prologue (Opening Remarks) field by wrapping malicious payloads in tags. The backend fails to sanitize or encode HTML entities in the prologue field when applications are created or updated via the /admin/api/workspace/{workspace_id}/application endpoint, storing the raw payload directly in the database. The frontend then renders this content using an innerHTML-equivalent mechanism, trusting -wrapped content to be safe, which enables persistent DOM-based Stored XSS execution against any visitor who opens the affected chatbot interface. Exploitation can lead to session hijacking, unauthorized actions performed on behalf of victims (such as deleting workspaces or applications), and sensitive data exposure. This issue has been fixed in version 2.8.0.

The advisory is available at github.com. This vulnerability was named CVE-2026-39425 since 04/07/2026. The exploitation appears to be easy. The attack can be initiated 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.

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Productinfo

Vendor

• 1Panel-dev

Name

• MaxKB

Version

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

Website

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

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