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.

INFO

Published Date :

2026-05-08T14:27:48.588Z

Last Modified :

2026-05-08T14:27:48.588Z

Source :

GitHub_M
AFFECTED PRODUCTS

The following products are affected by CVE-2026-41487 vulnerability.

Vendors Products
Langfuse
  • Langfuse

CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
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Privileges Required
User Interaction
VS Confidentiality
VS Integrity
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SS Confidentiality
SS Integrity
SS Availability