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

Quick assessment

Affected
1Panel-dev MaxKB
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MaxKB是1Panel-dev开源的一款基于大语言模型和 RAG 的开源知识库问答系统。 MaxKB 2.7.1及之前版本存在安全漏洞，该漏洞源于聊天导出功能对CSV文件中的公式元素中和不当，可能导致管理员打开导出的Excel文件时在工作站上执行任意代码。

AI Predicted 8.2 Difficulty: Moderate EPSS 0.45% · P37

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-39424

Vulnerability Information
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Vulnerability Title
MaxKB has CSV Injection in its Application Chat Export Functionality
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1236
Source: CVE Program / CVE List V5
Vulnerability Title
MaxKB 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MaxKB是1Panel-dev开源的一款基于大语言模型和 RAG 的开源知识库问答系统。 MaxKB 2.7.1及之前版本存在安全漏洞，该漏洞源于聊天导出功能对CSV文件中的公式元素中和不当，可能导致管理员打开导出的Excel文件时在工作站上执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
1Panel-dev MaxKB < 2.8.0 -

II. Public POCs for CVE-2026-39424

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III. Intelligence Information for CVE-2026-39424

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Patches & Fixes for CVE-2026-39424 (1)

Vendor Advisories for CVE-2026-39424 (1)

Same Patch Batch · 1Panel-dev · 2026-04-14 · 10 CVEs total

CVE-2026-39420 6.3 MEDIUM MaxKB: Sandbox escape via LD_PRELOAD bypass
CVE-2026-39421 6.3 MEDIUM MaxKB: Sandbox escape via ctypes and unhooked SYS_pkey_mprotect
CVE-2026-39418 5.0 MEDIUM MaxKB: SSRF via sandbox network hook bypass
CVE-2026-39417 4.6 MEDIUM MaxKB: RCE via MCP stdio command injection in workflow engine
CVE-2026-39419 3.1 LOW MaxKB: Sandbox Result Validation Bypass via Tool Output Spoofing
CVE-2026-39423 Stored XSS via Eval Injection in EchartsRander Component
CVE-2026-39425 MaxKB: Stored XSS via Unsanitized html_rander Tags in Markdown Rendering
CVE-2026-39426 MaxKB: Stored XSS via Unsanitized iframe_render Parsing
CVE-2026-39422 MaxKB has Stored XSS via ChatHeadersMiddleware

IV. Related Vulnerabilities

Same product: MaxKB
Same vendor: 1Panel-dev
Same weakness: CWE-1236

V. Comments for CVE-2026-39424

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