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CVE-2025-59305

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Date: September 23, 2025

Improper authorization in the background migration endpoints of Langfuse 3.1 before d67b317 allows any authenticated user to invoke migration control functions. This can lead to data corruption or denial of service through unauthorized access to TRPC endpoints such as backgroundMigrations.all, backgroundMigrations.status, and backgroundMigrations.retry.

Severity Score

Related Resources (5)

https://github.com/langfuse/langfuse/pull/9028
https://depthfirst.com/post/how-an-authorization-flaw-reveals-a-common-security-blind-spot-cve-2025-59305-case-study
https://nvd.nist.gov/vuln/detail/CVE-2025-59305
https://depthfirst.webflow.io/post/how-an-authorization-flaw-reveals-a-common-security-blind-spot-cve-2025-59305-case-study
https://www.mend.io/vulnerability-database/CVE-2025-59305

Severity Score

Weakness Type (CWE)

Improper Authorization

CWE-285

Top Fix

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Upgrade Version

Upgrade to version https://github.com/langfuse/langfuse.git - v3.109.0

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): LOW
Availability (A): LOW

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