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5.3
MaxKB Chat Export Feature Allows Malicious Excel Files
CVE-2026-39424
Summary
The chat export feature in MaxKB versions 2.7.1 and below can create Excel files that can harm your computer if you open them with Microsoft Excel. This is a security risk, so update to version 2.8.0 or later to fix the issue.
Original title
MaxKB is an open-source AI assistant for enterprise. In versions 2.7.1 and below, the chat export feature is vulnerable to Improper Neutralization of Formula Elements in a CSV File. When an adminis...
Original description
MaxKB is an open-source AI assistant for enterprise. In versions 2.7.1 and below, the chat export feature is vulnerable to Improper Neutralization of Formula Elements in a CSV File. When an administrator exports the application chat history to an Excel file (.xlsx) via the /admin/api/workspace/{workspace_id}/application/{application_id}/chat/export endpoint, strings starting with formula characters are written directly without proper sanitization. Opening this file in spreadsheet applications like Microsoft Excel can lead to Arbitrary Code Execution (RCE) on the administrator's workstation via Dynamic Data Exchange (DDE). The issue is a variant of CVE-2025-4546, which fixed the exact same pattern in apps/dataset/serializers/document_serializers.py but missed the application chat export sink. This issue has been fixed in version 2.8.0.
nvd CVSS4.0
5.3
Vulnerability type
CWE-1236
Published: 14 Apr 2026 · Updated: 16 Apr 2026 · First seen: 14 Apr 2026