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CVE-2026-86543— knowns before 0.30.0 Unauthenticated Management API Exposure

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 0.30.0之前版本存在授权问题漏洞，该漏洞源于管理API默认在所有网络接口上无需身份验证即可访问且全新安装无需密码，可能导致攻击者访问未经验证的/api/tunnel/start端点以配置公共隧道并将API重新发布到公开可访问的地址。

CVSS 9.8 · Critical EPSS 0.86% · P58

Affected Version Matrix 2

VendorProduct Version RangeStatus
knowns-dev knowns < 0.30.0 affected
0.30.0 unaffected
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I. Basic Information for CVE-2026-86543

Vulnerability Information
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Vulnerability Title
knowns before 0.30.0 Unauthenticated Management API Exposure
Source: CVE Program / CVE List V5
Vulnerability Description
knowns versions before 0.30.0 serve the management API without authentication on all network interfaces by default, with no password required on fresh installations. Attackers can access the unauthenticated /api/tunnel/start endpoint to provision a public tunnel and republish the API at a publicly accessible address.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Knowns.dev Knowns 授权问题漏洞
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 0.30.0之前版本存在授权问题漏洞，该漏洞源于管理API默认在所有网络接口上无需身份验证即可访问且全新安装无需密码，可能导致攻击者访问未经验证的/api/tunnel/start端点以配置公共隧道并将API重新发布到公开可访问的地址。
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 ~ 0.30.0 -

II. Public POCs for CVE-2026-86543

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III. Intelligence Information for CVE-2026-86543

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Patches & Fixes for CVE-2026-86543 (4)

Vendor Advisories for CVE-2026-86543 (2)

Vendor Pages for CVE-2026-86543 (1)

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

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
CVE-2026-86539 7.2 HIGH knowns through 0.33.0 Server-Side Request Forgery via embedding-models endpoint

IV. Related Vulnerabilities

Same product: knowns
Same vendor: knowns-dev
Same weakness: CWE-306

V. Comments for CVE-2026-86543

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