CVE-2026-42335— MaxKB: SSRF Bypass in MaxKB OSS URL Fetch due to URL Parsing Discrepancy
Possible ATT&CK Techniques 1AI
T1557 · Adversary-in-the-MiddleAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 1Panel-dev | MaxKB | < 2.8.1 | affected |
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I. Basic Information for CVE-2026-42335
Vulnerability Information
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Vulnerability Title
MaxKB: SSRF Bypass in MaxKB OSS URL Fetch due to URL Parsing Discrepancy
Source: NVD (National Vulnerability Database)
Vulnerability Description
MaxKB is an open-source AI assistant for enterprise. Prior to 2.8.1, MaxKB v2.8.0 and prior are vulnerable to a server-side request forgery (SSRF) bypass in the OSS file service URL fetch (chat/api/oss/get_url) endpoint. The vulnerability exists due to inconsistent URL parsing between the urlparse validation function and the requests HTTP client, allowing attackers to access internal network services. This vulnerability is fixed in 2.8.1.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
服务端请求伪造(SSRF)
Source: NVD (National Vulnerability Database)
Vulnerability Title
MaxKB 代码问题漏洞
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 2.8.1之前版本存在代码问题漏洞，该漏洞源于OSS文件服务URL获取端点中存在服务端请求伪造绕过漏洞，可能导致攻击者访问内部网络服务。
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-2026-42335
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-42335 (1)
Same Patch Batch · 1Panel-dev · 2026-05-26 · 6 CVEs total
| CVE-2026-44847 | 7.5 HIGH | MaxKB: Webhook Trigger Authentication Bypass |
| CVE-2026-42337 | MaxKB: Broken Access Control in MaxKB OSS URL Fetch API | |
| CVE-2026-42336 | MaxKB: SSRF Bypass via DNS Rebinding in MaxKB OSS URL Fetch | |
| 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-2026-42337
MaxKB: Broken Access Control in MaxKB OSS URL Fetch API - 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
Same vendor: 1Panel-dev
- CVE-2026-42336
MaxKB: SSRF Bypass via DNS Rebinding in MaxKB OSS URL Fetch - CVE-2026-42337
MaxKB: Broken Access Control in MaxKB OSS URL Fetch API - 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
Same weakness: CWE-918
- CVE-2026-9813
FlowIntel external reference URL probe allows server-side re - CVE-2026-5737
Independent Analytics <= 2.14.9 - Unauthenticated Server-Sid - CVE-2026-48148
Budibase: Unvalidated VectorDB Host Parameter Enables SSRF - CVE-2026-45548
Budibase: SSRF in AI Extract File Automation Step via Missin - CVE-2026-45715
Budibase: SSRF Bypass via HTTP Redirect in REST Datasource I
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