CVE-2026-42337— MaxKB: Broken Access Control in MaxKB OSS URL Fetch API
Possible ATT&CK Techniques 2AI
T1059 · Command and Scripting Interpreter T1530 · Data from Cloud StorageAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
授权机制缺失
Source: NVD (National Vulnerability Database)
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
| # | POC Description | Source Link | Shenlong Link |
|---|
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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
- CVE-2026-42336
MaxKB: SSRF Bypass via DNS Rebinding in MaxKB OSS URL Fetch - CVE-2026-44847
MaxKB: Webhook Trigger Authentication Bypass - CVE-2026-45412
MaxKB: Unauthenticated SSRF via Workflow Template Import - CVE-2026-45413
MaxKB: Unsalted MD5 Password Hashing - CVE-2026-42335
MaxKB: SSRF Bypass in MaxKB OSS URL Fetch due to URL Parsing
Same vendor: 1Panel-dev
- CVE-2026-10567
1Panel-dev CordysCRM ModuleFormController ModuleFormService. - CVE-2026-10514
1Panel-dev CordysCRM RequestParamTrimConfig.java cross site - CVE-2026-42336
MaxKB: SSRF Bypass via DNS Rebinding in MaxKB OSS URL Fetch - CVE-2026-44847
MaxKB: Webhook Trigger Authentication Bypass - CVE-2026-45412
MaxKB: Unauthenticated SSRF via Workflow Template Import
Same weakness: CWE-862
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nextlevelbuilder GoClaw Team Task Completion team_tasks_life - CVE-2026-40571
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V. Comments for CVE-2026-42337
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