🛡️ CVE-2026-41487 — langfuse

🟡 CVSS 5.4 — Medium ✅ No Known Exploit CWE-284 NVD
5.4
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity low, availability none.

Weakness class

CVE-2026-41487 is classified as CWE-284: Improper Access Control. The software does not restrict an action to the actors that should be allowed to perform it.

Affected software

CVE-2026-41487 is recorded against 2 packages.

  • langfuse (from 3.68.0 up to 3.167.0)
  • unknown

Timeline and source

Published on 8 May 2026 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

github.com
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Details

Severity MEDIUM
CVSS Score 5.4
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CWE CWE-284
Public Exploit ✅ No
Source NVD
Published 2026-05-08
Updated 2026-08-11
Modified 2026-06-17

Affected Packages

Software From version Fixed in
langfuse 3.68.0 3.167.0
unknown

Similar Threats

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