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CVE-2026-91921— Cross-Site Scripting (XSS) in 1millionbot’s AI chatbot platform

Quick assessment

Affected
1millionbot AI Chatbot Platform (SaaS) de 1millionbot.
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.

Cross-Site Scripting (XSS) vulnerability due to inadequate input sanitisation in the client-side rendering engine of the 1millionbot AI Chat Platform. An unauthenticated remote user could cause external hyperlinks to be rendered in the web interface by sending

CVSS 5.1 · Medium
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I. Basic Information for CVE-2026-91921

Vulnerability Information

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Vulnerability Title
Cross-Site Scripting (XSS) in 1millionbot’s AI chatbot platform
Source: CVE Program / CVE List V5
Vulnerability Description
Cross-Site Scripting (XSS) vulnerability due to inadequate input sanitisation in the client-side rendering engine of the 1millionbot AI Chat Platform. An unauthenticated remote user could cause external hyperlinks to be rendered in the web interface by sending messages containing Markdown syntax and certain unsanitised content blocks. The impact is limited to the user’s own interactive session; no compromise of internal infrastructure, access to third-party data or impact on administrative panels has been identified.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:L/SA: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

Affected Products

Vendor Product Affected Versions CPE Subscribe
1millionbot AI Chatbot Platform (SaaS) de 1millionbot. Version prior to CVE publication -

II. Public POCs for CVE-2026-91921

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III. Intelligence Information for CVE-2026-91921

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Other References for CVE-2026-91921 (1)

IV. Related Vulnerabilities

Same vendor: 1millionbot
Same weakness: CWE-79

V. Comments for CVE-2026-91921

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