# CVE-2026-39425: MaxKB is an open-source AI assistant for enterprise. Versions 2.7.1 and below contain a Stored Cross-Site Scripting…

Source: https://junglewise.ai/threats/cve-2026-39425-maxkb-is-an-open-source-ai-assistant-for-enterprise-versions-2-7  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-14  
License: CC BY 4.0 with a link back

CVE-2026-39425 · Severity: medium · CVSS 5.4 · Published 2026-04-14

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 <html_rander> 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 <html_rander>-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.

Technologies: [Maxkb](https://junglewise.ai/threats/technologies/maxkb-maxkb). Vendors: [Maxkb](https://junglewise.ai/threats/vendors/maxkb).

## Quick answers

**Is CVE-2026-39425 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-39425 being exploited in the wild.

**How severe is CVE-2026-39425?** Medium severity, with a CVSS score of 5.4, published 14 April 2026.

**Which products and versions are affected?** Maxkb. The advisory does not name versions.

**Is there a fix for CVE-2026-39425?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2026-39425?** Check whether you run Maxkb. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Maxkb

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