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CVE-2026-86539— knowns through 0.33.0 Server-Side Request Forgery via embedding-models endpoint

Quick assessment

Affected
knowns-dev knowns
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.

Knowns.dev Knowns是Knowns.dev组织的一款知识管理应用。 Knowns.dev Knowns 0.33.0及之前版本存在服务端请求伪造漏洞，该漏洞源于POST /api/embedding-models/test端点未经验证即向调用者提供的目标发出出站请求，可能导致服务端请求伪造，攻击者可通过观察传输错误消息枚举内部主机和云元数据端点。

CVSS 7.2 · High EPSS 0.35% · P28

Affected Version Matrix 1

VendorProduct Version RangeStatus
knowns-dev knowns ≤ 0.33.0 affected
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I. Basic Information for CVE-2026-86539

Vulnerability Information
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Vulnerability Title
knowns through 0.33.0 Server-Side Request Forgery via embedding-models endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
knowns through 0.33.0 contains a server-side request forgery vulnerability in the POST /api/embedding-models/test endpoint that issues outbound requests to caller-supplied destinations without validation. Attackers can enumerate internal hosts and cloud metadata endpoints by observing transport error messages that reveal network reachability information.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Knowns.dev Knowns 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Knowns.dev Knowns是Knowns.dev组织的一款知识管理应用。 Knowns.dev Knowns 0.33.0及之前版本存在服务端请求伪造漏洞，该漏洞源于POST /api/embedding-models/test端点未经验证即向调用者提供的目标发出出站请求，可能导致服务端请求伪造，攻击者可通过观察传输错误消息枚举内部主机和云元数据端点。
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
knowns-dev knowns 0 ~ 0.33.0 -

II. Public POCs for CVE-2026-86539

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III. Intelligence Information for CVE-2026-86539

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Patches & Fixes for CVE-2026-86539 (2)

Vendor Advisories for CVE-2026-86539 (2)

Same Patch Batch · knowns-dev · 2026-09-07 · 8 CVEs total

CVE-2026-86543 9.8 CRITICAL knowns before 0.30.0 Unauthenticated Management API Exposure
CVE-2026-86542 9.1 CRITICAL knowns before 0.30.0 Path Traversal via Import Name
CVE-2026-86439 8.8 HIGH knowns before 0.30.0 Path Traversal via MCP doc and memory tools
CVE-2026-86541 8.3 HIGH knowns before 0.30.0 Path Traversal via code.replace MCP action
CVE-2026-86544 8.1 HIGH knowns before 0.30.0 Authorization Bypass via Misclassified Code Actions
CVE-2026-86540 7.8 HIGH knowns before 0.30.0 Arbitrary Code Execution via LSP Binary
CVE-2026-86538 7.5 HIGH knowns before 0.30.0 Path Traversal via templateFile parameter

IV. Related Vulnerabilities

Same product: knowns
Same vendor: knowns-dev
Same weakness: CWE-918

V. Comments for CVE-2026-86539

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