CVE-2026-28509— LangBot has a Cross Site Scripting(XSS) Vulnerability
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 4.8.7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。
Possible ATT&CK Techniques 1 AI
T1059 · Command and Scripting Interpreter
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
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
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| langbot-app | LangBot | < 4.8.7 | - |
|
II. Public POCs for CVE-2026-28509
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-28509 (1)
-
Merge commit from fork · langbot-app/LangBot@614621a · GitHub x_refsource_MISC
Vendor Advisories for CVE-2026-28509 (1)
IV. Related Vulnerabilities
Same product: LangBot
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CVE-2026-112265
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CVE-2026-90938
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CVE-2026-90562
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CVE-2026-54449
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CVE-2025-59835
LangBot has a cross-directory file upload vulnerability, whi
Same vendor: langbot-app
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CVE-2026-112265
LangBot through 4.11.0 Missing Lark/Feishu Webhook Authentic -
CVE-2026-90938
LangBot through 0.4.17 Unauthenticated Plugin Registration v -
CVE-2026-90562
LangBot before 4.10.11 Authentication Bypass via Weak Recove -
CVE-2026-54449
LangBot: Authenticated RCE Via MCP Configuration -
CVE-2025-59835
LangBot has a cross-directory file upload vulnerability, whi
Same weakness: CWE-79
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CVE-2026-112249
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CVE-2026-112247
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V. Comments for CVE-2026-28509
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