CVE-2026-24055

MEDIUM EPSS 31.6%
Published Jan 22, 20265mo ago · Modified Jun 17, 20262w ago
6.3 CVSS 4.0
Medium
Find Similar
Published Jan 22, 2026 5mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
6.3
Exploitability
—
Impact
—
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
31.6% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 2

CWE-284
CWE-862 Missing Authorization Authorization

Affected Products 1

VendorProductVersionRange
langfuselangfuse*≥3.89.0  –  <3.147.0

References 4

  • github.com https://github.com/langfuse/langfuse/commit/3adc89e4d72729eabef55e46888b8ce80a7e3b0a
    Patch
  • github.com https://github.com/langfuse/langfuse/releases/tag/v3.147.0
    ProductRelease Notes
  • github.com https://github.com/langfuse/langfuse/security/advisories/GHSA-pvq7-vvfj-p98x
    ExploitMitigationThird Party Advisory
  • langfuse.com https://langfuse.com/docs/prompt-management/features/webhooks-slack-integrations
    Product

Remediation

  • github.com https://github.com/langfuse/langfuse/commit/3adc89e4d72729eabef55e46888b8ce80a7e3b0a
    Patch