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CVE-2026-88899— knowns before 0.31.0 External Control of Agent Working Directory via x-opencode-directory Header

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软件。 Knowns.dev Knowns 0.31.0之前版本存在输入验证错误漏洞，该漏洞源于/api/opencode代理端点未正确验证x-opencode-directory请求标头，远程攻击者可提供任意目录路径，在主机系统项目根目录之外执行文件操作。

CVSS 9.8 · Critical EPSS 0.81% · P56

Affected Version Matrix 2

VendorProduct Version RangeStatus
knowns-dev knowns < 0.31.0 affected
0.31.0 unaffected
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I. Basic Information for CVE-2026-88899

Vulnerability Information
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Vulnerability Title
knowns before 0.31.0 External Control of Agent Working Directory via x-opencode-directory Header
Source: CVE Program / CVE List V5
Vulnerability Description
knowns versions before 0.31.0 fail to properly validate the x-opencode-directory request header in the /api/opencode proxy endpoint. Remote attackers can supply arbitrary directory paths to execute file operations outside the project root on the host system.
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
文件名或路径的外部可控制
Source: CVE Program / CVE List V5
Vulnerability Title
Knowns.dev Knowns 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Knowns.dev Knowns是Knowns.dev组织的一款知识管理软件。 Knowns.dev Knowns 0.31.0之前版本存在输入验证错误漏洞，该漏洞源于/api/opencode代理端点未正确验证x-opencode-directory请求标头，远程攻击者可提供任意目录路径，在主机系统项目根目录之外执行文件操作。
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
knowns-dev knowns 0 ~ 0.31.0 -

II. Public POCs for CVE-2026-88899

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III. Intelligence Information for CVE-2026-88899

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Vendor Advisories for CVE-2026-88899 (2)

Vendor Pages for CVE-2026-88899 (1)

Same Patch Batch · knowns-dev · 2026-09-10 · 5 CVEs total

CVE-2026-88937 8.8 HIGH knowns through 0.33.0 Path Traversal via Template Engine
CVE-2026-88939 8.3 HIGH knowns through 0.33.0 Authorization Bypass via project.set Bootstrap Exemption
CVE-2026-88938 6.5 MEDIUM knowns through 0.33.0 Path Traversal via code.find MCP tool
CVE-2026-88940 5.3 MEDIUM knowns through 0.33.0 Arbitrary Directory Enumeration via workspace browse endpoint

IV. Related Vulnerabilities

Same product: knowns
Same vendor: knowns-dev
Same weakness: CWE-73

V. Comments for CVE-2026-88899

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