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    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.

    Published:Jan 22, 2026
    Last Modified:Apr 18, 2026
    EPS:Jan 22, 2026
    EPSS Score:0.00039
    CVSS Score:5.3

    Affected Products

    Vendor
    Langfuse
    Product
    Langfuse

    Exploits

    https://github.com/langfuse/langfuse/security/advisories/GHSA-pvq7-vvfj-p98xhttps://github.com/imzanggg/CVE-2026-24055-OAuth-Langfuse

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High