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CVE-2026-24055

MEDIUM
5.3

Description

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.

CVE Details

CVSS v3.1 Score5.3
SeverityMEDIUM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack VectorNETWORK
ComplexityLOW
Privileges RequiredNONE
User InteractionNONE
Published1/22/2026
Last Modified2/17/2026
Sourcenvd
Honeypot Sightings0

Affected Products

langfuse:langfuse

Weaknesses (CWE)

CWE-284CWE-862

References

https://github.com/langfuse/langfuse/commit/3adc89e4d72729eabef55e46888b8ce80a7e3b0a(security-advisories@github.com)
https://github.com/langfuse/langfuse/releases/tag/v3.147.0(security-advisories@github.com)
https://github.com/langfuse/langfuse/security/advisories/GHSA-pvq7-vvfj-p98x(security-advisories@github.com)
https://langfuse.com/docs/prompt-management/features/webhooks-slack-integrations(security-advisories@github.com)

IOC Correlations

No correlations recorded

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