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CVE-2026-42337— MaxKB: Broken Access Control in MaxKB OSS URL Fetch API

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 2.8.0及之前版本存在安全漏洞，该漏洞源于OSS文件服务URL获取API中存在访问控制缺陷，可能导致攻击者在其他应用策略下执行操作。

AI Predicted 7.5 Difficulty: Easy EPSS 0.35% · P26

Affected Version Matrix 1

VendorProduct Version RangeStatus
1Panel-dev MaxKB < 2.8.1 affected
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I. Basic Information for CVE-2026-42337

Vulnerability Information
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Vulnerability Title
MaxKB: Broken Access Control in MaxKB OSS URL Fetch API
Source: CVE Program / CVE List V5
Vulnerability Description
MaxKB is an open-source AI assistant for enterprise. MaxKB 2.8.0 and prior are vulnerable to a broken access control vulnerability in the OSS file service URL fetch API (chat/api/oss/get_url). The endpoint uses application_id from the URL path without validating ownership, allowing attackers to perform operations under other applications’ policies. This vulnerability is fixed in 2.8.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
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 2.8.0及之前版本存在安全漏洞，该漏洞源于OSS文件服务URL获取API中存在访问控制缺陷，可能导致攻击者在其他应用策略下执行操作。
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 < 2.8.1 -

II. Public POCs for CVE-2026-42337

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III. Intelligence Information for CVE-2026-42337

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Vendor Advisories for CVE-2026-42337 (1)

Same Patch Batch · 1Panel-dev · 2026-05-26 · 6 CVEs total

CVE-2026-44847 7.5 HIGH MaxKB: Webhook Trigger Authentication Bypass
CVE-2026-42336 MaxKB: SSRF Bypass via DNS Rebinding in MaxKB OSS URL Fetch
CVE-2026-42335 MaxKB: SSRF Bypass in MaxKB OSS URL Fetch due to URL Parsing Discrepancy
CVE-2026-45412 MaxKB: Unauthenticated SSRF via Workflow Template Import
CVE-2026-45413 MaxKB: Unsalted MD5 Password Hashing

IV. Related Vulnerabilities

Same product: MaxKB
Same vendor: 1Panel-dev
Same weakness: CWE-862

V. Comments for CVE-2026-42337

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