Is CVE-2026-39425 actively exploited?

No active exploitation of CVE-2026-39425 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-39425 be exploited remotely?

Yes. CVE-2026-39425 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-39425?

CVE-2026-39425 has a CVSS score of 5.4 (MEDIUM).

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MEDIUM

CVE-2026-39425

CWE-80Published: April 14, 2026· Updated: Apr 20, 2026

5.4

CVSS v3.1

EPSS:0.07%probability of exploitation in 30 daysPercentile:21.3th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-39425 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.