CVE-2025-59835— LangBot has a cross-directory file upload vulnerability, which could lead to system takeover
Quick assessment
Affected
langbot-app LangBot
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
LangBot是LangBot开源的一个大模型即时通信机器人开发平台。 LangBot 4.1.0版本至4.3.5之前版本存在代码问题漏洞，该漏洞源于/api/v1/files/documents接口未严格限制服务器文件存储目录，可能导致任意文件上传。
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I. Basic Information for CVE-2025-59835
Vulnerability Information
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Vulnerability Title
LangBot has a cross-directory file upload vulnerability, which could lead to system takeover
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS: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
Source: CVE Program / CVE List V5
Vulnerability Type
相对路径遍历
Source: CVE Program / CVE List V5
Vulnerability Title
LangBot 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LangBot是LangBot开源的一个大模型即时通信机器人开发平台。 LangBot 4.1.0版本至4.3.5之前版本存在代码问题漏洞，该漏洞源于/api/v1/files/documents接口未严格限制服务器文件存储目录，可能导致任意文件上传。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| langbot-app | LangBot | >= 4.1.0, < 4.3.5 | - |
|
II. Public POCs for CVE-2025-59835
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2025-59835 (1)
Vendor Advisories for CVE-2025-59835 (1)
Vendor Pages for CVE-2025-59835 (1)
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Release v4.3.5 · langbot-app/LangBot · GitHub x_refsource_MISC
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Same weakness: CWE-23
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V. Comments for CVE-2025-59835
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