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.
History

Wed, 13 May 2026 17:15:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:langfuse:langfuse:*:*:*:*:*:*:*:*
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N'}


Fri, 08 May 2026 20:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 08 May 2026 16:30:00 +0000

Type Values Removed Values Added
First Time appeared Langfuse
Langfuse langfuse
Vendors & Products Langfuse
Langfuse langfuse

Fri, 08 May 2026 14:45:00 +0000

Type Values Removed Values Added
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.
Title Langfuse: Improper role-based-access control in Langfuse LLM connection management allowed users of role “member” to retrieve stored LLM provider API keys
Weaknesses CWE-284
References
Metrics cvssV4_0

{'score': 5.3, 'vector': '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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-08T19:44:31.496Z

Reserved: 2026-04-20T16:14:19.007Z

Link: CVE-2026-41487

cve-icon Vulnrichment

Updated: 2026-05-08T19:44:20.584Z

cve-icon NVD

Status : Analyzed

Published: 2026-05-08T15:16:39.800

Modified: 2026-05-13T17:12:55.190

Link: CVE-2026-41487

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-08T16:15:12Z