CVE-2026-24055

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.

CVSS v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/langfuse/langfuse/commit/3adc89e4d72729eabef55e46888b8ce80a7e3b0a	Patch
https://github.com/langfuse/langfuse/releases/tag/v3.147.0	Product Release Notes
https://github.com/langfuse/langfuse/security/advisories/GHSA-pvq7-vvfj-p98x	Exploit Mitigation Third Party Advisory
https://langfuse.com/docs/prompt-management/features/webhooks-slack-integrations	Product

Configurations

Configuration 1 (hide)

cpe:2.3:a:langfuse:langfuse:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-01-22 04:16

Updated : 2026-06-17 10:22

NVD link : CVE-2026-24055

Mitre link : CVE-2026-24055

CVE.ORG link : CVE-2026-24055

JSON object : View

Products Affected

langfuse

langfuse

CWE

CWE-284

Improper Access Control

CWE-862

Missing Authorization

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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."}, {"lang": "es", "value": "Langfuse es una plataforma de ingenier\u00eda de modelos de lenguaje grandes de c\u00f3digo abierto. En las versiones 3.146.0 e inferiores, el endpoint /api/public/slack/install inicia el OAuth de Slack utilizando un projectId proporcionado por el cliente sin autenticaci\u00f3n ni autorizaci\u00f3n. El projectId se conserva durante todo el flujo de OAuth, y la devoluci\u00f3n de llamada almacena las instalaciones bas\u00e1ndose en estos metadatos no confiables. Esto permite a un atacante vincular su espacio de trabajo de Slack a cualquier proyecto y potencialmente recibir cambios en las indicaciones (prompts) almacenadas en Langfuse Prompt Management. Un atacante puede reemplazar las integraciones existentes de Prompt Slack Automation o pre-registrar una maliciosa, aunque esto \u00faltimo requiere que un usuario autenticado la configure sin saberlo a pesar de los indicadores visibles del espacio de trabajo y del canal en la interfaz de usuario (UI). 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