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I. Basic Information for CVE-2026-28509
Vulnerability Information
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Vulnerability Title
LangBot has a Cross Site Scripting(XSS) Vulnerability
Source: NVD (National Vulnerability Database)
Vulnerability Description
LangBot is a global IM bot platform designed for LLMs. Prior to version 4.8.7, LangBot’s web UI renders user-supplied raw HTML using rehypeRaw, which can lead to a cross-site scripting (XSS) vulnerability. This issue has been patched in version 4.8.7.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: NVD (National Vulnerability Database)
Vulnerability Title
LangBot 跨站脚本漏洞
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 4.8.7之前版本存在跨站脚本漏洞，该漏洞源于使用rehypeRaw渲染用户提供的原始HTML，可能导致跨站脚本攻击。
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
VendorProductAffected VersionsCPESubscribe
langbot-appLangBot < 4.8.7 -
II. Public POCs for CVE-2026-28509
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III. Intelligence Information for CVE-2026-28509
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IV. Related Vulnerabilities
Same product: LangBot
Same vendor: langbot-app
Same weakness: CWE-79
V. Comments for CVE-2026-28509

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