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CVE-2025-59305: Improper Authorization Vulnerability in Langfuse 3.1

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Overview

The vulnerability CVE-2025-59305 exposes a critical flaw in Langfuse 3.1, a widely used software, which can cause severe damage to the system. It allows any authenticated user to access and control migration functions, leading to unauthorized access to TRPC endpoints. The potential impact includes system compromise and data leakage, making it an urgent issue to address.

Vulnerability Summary

CVE ID: CVE-2025-59305
Severity: High (CVSS: 7.6)
Attack Vector: Network
Privileges Required: Low
User Interaction: Required
Impact: Unauthorized access to migration control functions, potential data corruption, denial of service, and data leakage.

Affected Products

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Product | Affected Versions

Langfuse | 3.1 before d67b317

How the Exploit Works

The vulnerability resides in the improper authorization of the background migration endpoints of Langfuse 3.1. This flaw permits any authenticated user to invoke migration control functions, leading to unauthorized access to critical TRPC endpoints including backgroundMigrations.all, backgroundMigrations.status, and backgroundMigrations.retry. This could potentially corrupt data or cause denial of service.

Conceptual Example Code

Here is a conceptual example of how the vulnerability might be exploited. This could be a malicious HTTP request sent to a vulnerable endpoint:

POST /backgroundMigrations.all HTTP/1.1
Host: target.example.com
Content-Type: application/json
Authorization: Bearer <user_token>
{
"command": "start new migration",
"parameters": { "source": "production", "target": "backup" }
}

In this example, the attacker uses a legitimate user token to send a migration command to the “backgroundMigrations.all” endpoint, manipulating the system to start a new migration from the production database to a backup. This could lead to data corruption or even a denial of service attack if the migration is sufficiently large or complex.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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