CVE-2026-39424
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.
- Affected products
- Maxkb
- Maxkb
- < 2.8.0
- Fix
- Available
- CVSS 4.0
- 5.3 MEDIUM
- CVSS 3.1
- 4.7 MEDIUM
- EPSS
- 0.4% (30th percentile)
- Weakness
- CWE-1236
- NVD status
- Analyzed
- Published
- 2026-04-14
No indexed exploits for CVE-2026-39424 yet
Our index is partial: it proves presence, never absence
No exploit for CVE-2026-39424 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.