DNS
CVE-2026-24055
MEDIUM
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Lifecycle Timeline
4DescriptionGitHub Advisory
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.
AnalysisAI
Langfuse versions 3.146.0 and below allow unauthenticated attackers to hijack Slack OAuth integrations by injecting arbitrary projectIds into the /api/public/slack/install endpoint, enabling them to bind malicious Slack workspaces to any project and intercept prompt management data. An attacker can replace existing Prompt Slack Automations or pre-register malicious integrations that execute when authenticated users unknowingly configure them. Public exploit code exists for this vulnerability, which affects the DNS and AI/ML components of the Langfuse platform.
Technical ContextAI
Classified as CWE-284 (Improper Access Control). Affects Langfuse. 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
RemediationAI
A vendor patch is available — apply it immediately. Fixed in version 3.147.0.. Restrict network access to the affected service where possible.
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Same weakness CWE-284 – Improper Access Control
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External POC / Exploit Code
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