CVE-2025-59835: Langbot-App Langbot

High severity, CVSS 8.6. EPSS: 0.4% chance of exploitation in the next 30 days.

LangBot is a global IM bot platform designed for LLMs. In versions 4.1.0 up to but not including 4.3.5, authorized attackers can exploit the /api/v1/files/documents interface to perform arbitrary file uploads. Since this interface does not strictly restrict the storage directory of files on the server, it is possible to upload dangerous files to specific system directories. This is fixed in version 4.3.5.

Affected products

• Langbot-App Langbot: from 4.1.0, before 4.3.5 (fixed in 4.3.5)

Published 2025-10-02. Last modified 2026-06-17.