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CVE-2026-24055— Langfuse Slack OAuth Installation Endpoint Lacks Authentication, Enabling Arbitrary Project Linking

Quick assessment

Affected
langfuse langfuse
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

langfuse是Langfuse开源的一个大语言模型工程平台。 langfuse 3.146.0及之前版本存在访问控制错误漏洞，该漏洞源于/api/public/slack/install端点使用未经身份验证或授权的客户端提供的projectId发起Slack OAuth，可能导致攻击者将其Slack工作区绑定到任意项目并接收提示更改。

AI Predicted 8.1 Difficulty: Moderate EPSS 0.44% · P36
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I. Basic Information for CVE-2026-24055

Vulnerability Information
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Vulnerability Title
Langfuse Slack OAuth Installation Endpoint Lacks Authentication, Enabling Arbitrary Project Linking
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
langfuse 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
langfuse是Langfuse开源的一个大语言模型工程平台。 langfuse 3.146.0及之前版本存在访问控制错误漏洞，该漏洞源于/api/public/slack/install端点使用未经身份验证或授权的客户端提供的projectId发起Slack OAuth，可能导致攻击者将其Slack工作区绑定到任意项目并接收提示更改。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
langfuse langfuse >= 3.89.0, < 3.147.0 -

II. Public POCs for CVE-2026-24055

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III. Intelligence Information for CVE-2026-24055

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Patches & Fixes for CVE-2026-24055 (1)

IV. Related Vulnerabilities

Same product: langfuse
Same vendor: langfuse
Same weakness: CWE-284

V. Comments for CVE-2026-24055

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