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CVE-2026-41487— Langfuse: Improper role-based-access control in Langfuse LLM connection management allowed users of role “member” to retrieve stored LLM provider API keys

Quick assessment

Affected
langfuse langfuse
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.

langfuse是Langfuse开源的一个大语言模型工程平台。 Langfuse 3.68.0版本至3.167.0之前版本存在访问控制错误漏洞，该漏洞源于LLM连接更新流程中基于角色的访问控制缺陷，可能导致低权限用户重定向测试请求并暴露明文提供商API密钥。

AI Predicted 5.4 Difficulty: Moderate EPSS 0.32% · P22

Possible ATT&CK Techniques 1 AI

T1528 · Steal Application Access Token

Affected Version Matrix 1

VendorProduct Version RangeStatus
langfuse langfuse >= 3.68.0, < 3.167.0 affected
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I. Basic Information for CVE-2026-41487

Vulnerability Information
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Vulnerability Title
Langfuse: Improper role-based-access control in Langfuse LLM connection management allowed users of role “member” to retrieve stored LLM provider API keys
Source: CVE Program / CVE List V5
Vulnerability Description
Langfuse is an open source large language model engineering platform. From version 3.68.0 to before version 3.167.0, there is a role-based-access control flaw in the LLM connection update flow. An authenticated, low-privileged user of role “member” in a project could request the update of an existing LLM connection to an attacker-controlled baseUrl, causing Langfuse to reuse the stored provider secret and redirect the test request to an attacker-controlled endpoint. This could expose the plaintext provider LLM API key for that connection. The attack is only possible if a user is already part of a project and has “member” scoped access. This issue has been patched in version 3.167.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
langfuse 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
langfuse是Langfuse开源的一个大语言模型工程平台。 Langfuse 3.68.0版本至3.167.0之前版本存在访问控制错误漏洞，该漏洞源于LLM连接更新流程中基于角色的访问控制缺陷，可能导致低权限用户重定向测试请求并暴露明文提供商API密钥。
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
langfuse langfuse >= 3.68.0, < 3.167.0 -

II. Public POCs for CVE-2026-41487

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III. Intelligence Information for CVE-2026-41487

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Patches & Fixes for CVE-2026-41487 (4)

Vendor Advisories for CVE-2026-41487 (1)

Other References for CVE-2026-41487 (1)

IV. Related Vulnerabilities

Same product: langfuse
Same vendor: langfuse
Same weakness: CWE-284

V. Comments for CVE-2026-41487

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