Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Maxkb | Maxkb | < 2.8.0 |
Related Weaknesses (CWE)
References
- https://github.com/1Panel-dev/MaxKB/commit/24cd68acae5f726eed828e2ac801827a2a705Patch
- https://github.com/1Panel-dev/MaxKB/releases/tag/v2.8.0Release Notes
- https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-rr4r-7cj2-29vpVendor Advisory
FAQ
What is CVE-2026-39424?
CVE-2026-39424 is a vulnerability with a CVSS score of 4.7 (MEDIUM). 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 administra...
How severe is CVE-2026-39424?
CVE-2026-39424 has been rated MEDIUM with a CVSS base score of 4.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-39424?
Check the references section above for vendor advisories and patch information. Affected products include: Maxkb Maxkb.