CVE-2026-39422: MaxKB is an open-source AI assistant for enterprise. Versions 2.7.1 and below contain a Stored Cross-Site Scripting…
CVE-2026-39422 · 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 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.
No. Junglewise Threat Intelligence has no report of CVE-2026-39422 being exploited in the wild.
How severe is CVE-2026-39422?
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-2026-39422?
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-2026-39422?
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.