Vulnerability · Published Apr 14, 2026 · Assigned by GitHub_M

CVE-2026-39424MaxKB has CSV Injection in its Application Chat Export Functionality

Medium 5.3

In plain English

A medium-severity security flaw in MaxKB from 1Panel-dev. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities).

Severity (CVSS 4.0)5.3Medium

Exploit odds (30 days)0.4%top 69.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
1Panel-dev	MaxKB	< 2.8.0

Weakness: CWE-1236 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

References

https://github.com/1Panel-dev/MaxKB/security/advisories/GHSA-rr4r-7cj2-29vp x_refsource_CONFIRM
https://github.com/1Panel-dev/MaxKB/commit/24cd68acae5f726eed828e2ac801827a2a70536f x_refsource_MISC
https://github.com/1Panel-dev/MaxKB/releases/tag/v2.8.0 x_refsource_MISC