CVE-2026-24055 (GCVE-0-2026-24055)
Vulnerability from cvelistv5 – Published: 2026-01-22 03:07 – Updated: 2026-01-22 12:40
VLAI
EPSS
VEX
Title
Langfuse Slack OAuth Installation Endpoint Lacks Authentication, Enabling Arbitrary Project Linking
Summary
Langfuse is an open source large language model engineering platform. In versions 3.146.0 and below, the /api/public/slack/install endpoint initiates Slack OAuth using a projectId provided by the client without authentication or authorization. The projectId is preserved throughout the OAuth flow, and the callback stores installations based on this untrusted metadata. This allows an attacker to bind their Slack workspace to any project and potentially receive changes to prompts stored in Langfuse Prompt Management. An attacker can replace existing Prompt Slack Automation integrations or pre-register a malicious one, though the latter requires an authenticated user to unknowingly configure it despite visible workspace and channel indicators in the UI. This issue has been fixed in version 3.147.0.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-22 12:40 UTC
CWE
- CWE-284 - Improper Access Control
Assigner
GitHub_M
CNA
References
4 references
| URL | Tags |
|---|---|
| https://github.com/langfuse/langfuse/security/adv… | x_refsource_CONFIRM |
| https://github.com/langfuse/langfuse/commit/3adc8… | x_refsource_MISC |
| https://github.com/langfuse/langfuse/releases/tag… | x_refsource_MISC |
| https://langfuse.com/docs/prompt-management/featu… | x_refsource_MISC |
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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