CVE-2025-59835

Description

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.

Weakness Type (CWE)

CWE-23 CWE-23

CWE-434 Unrestricted Upload

References

Other References

https://github.com/langbot-app/LangBot/pull/1691 https://github.com/langbot-app/LangBot/releases/tag/v4.3.5 https://github.com/langbot-app/LangBot/security/advisories/GHSA-7j3j-qj83-9qv4

Frequently Asked Questions

What is CVE-2025-59835? +

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.

How do I check if I'm vulnerable to CVE-2025-59835? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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