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.

CVSS 4.0

8.6CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P

EPSS

0.4% chance of exploitation in the next 30 days; higher than 35% of CVEs (scores of 2026-10-25)

CWEs

CWE-23, CWE-434

Published

2025-10-02

Modified

2026-10-19

Record from

the NVD, synced 2026-10-19

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

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