OAuth Bypass Vulnerability in Langfuse Platform by Langfuse
CVE-2026-24055

6.3MEDIUM

Key Information:

Vendor

Langfuse

Status
Langfuse
Vendor
CVE Published:
22 January 2026

What is CVE-2026-24055?

A vulnerability exists in the Langfuse platform where the /api/public/slack/install endpoint allows clients to initiate Slack OAuth without proper authentication or authorization. This exposure of the projectId enables an attacker to link their Slack workspace to any project, potentially gaining unauthorized access to stored prompts. Furthermore, the vulnerability allows malicious actors to replace existing integrations or pre-register harmful ones, provided they can gain access through authenticated user interactions. This issue is resolved in version 3.147.0.

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Affected Version(s)

langfuse >= 3.89.0, < 3.147.0

References

https://github.com/langfuse/langfuse/security/advisories/...
x_refsource_CONFIRM
https://github.com/langfuse/langfuse/commit/3adc89e4d7272...
x_refsource_MISC
https://github.com/langfuse/langfuse/releases/tag/v3.147.0
x_refsource_MISC

CVSS V4

Score:
6.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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