CVE-2026-28445— Typebot: Stored XSS via Rating Block Custom Icon Bypasses isUnsafe Sandbox in Builder Preview
Quick assessment
Affected
baptisteArno typebot.io
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.
Typebot是Baptiste Arnaud个人开发者的一个开源聊天机器人构建器。 Typebot 3.15.2及之前版本存在安全漏洞，该漏洞源于embed包中的RatingButton组件使用Solid的innerHTML指令渲染用户控制的customIcon.svg字段而未进行清理，可能导致在构建器的认证环境中执行任意HTML/JS，允许会话劫持和权限提升。
Possible ATT&CK Techniques 2 AI
T1189 · Drive-by Compromise T1059 · Command and Scripting InterpreterAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| baptisteArno | typebot.io | < 3.16.0 |
affected |
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I. Basic Information for CVE-2026-28445
Vulnerability Information
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Vulnerability Title
Typebot: Stored XSS via Rating Block Custom Icon Bypasses isUnsafe Sandbox in Builder Preview
Source: CVE Program / CVE List V5
Vulnerability Description
Typebot is a chatbot builder tool. In versions 3.15.2 and prior, the RatingButton component in the embed package renders the user-controlled customIcon.svg field directly via Solid's innerHTML directive without any sanitization, even though DOMPurify is already a dependency and is used elsewhere in the codebase (e.g., StreamingBubble.tsx). Because rating blocks are not flagged as isUnsafe by the import sanitizer and the builder preview renders bots inline on the builder's own origin (builder.typebot.io) under a CSP permitting 'unsafe-inline', a malicious imported or collaborator-crafted typebot can execute arbitrary HTML/JS in the builder's authenticated context, bypassing the Web Worker sandbox that protects Script blocks during preview. This allows session hijacking and privilege escalation within the builder application. This issue has been fixed in version 3.16.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/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
Typebot 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Typebot是Baptiste Arnaud个人开发者的一个开源聊天机器人构建器。 Typebot 3.15.2及之前版本存在安全漏洞，该漏洞源于embed包中的RatingButton组件使用Solid的innerHTML指令渲染用户控制的customIcon.svg字段而未进行清理，可能导致在构建器的认证环境中执行任意HTML/JS，允许会话劫持和权限提升。
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 |
|---|---|---|---|---|
| baptisteArno | typebot.io | < 3.16.0 | - |
|
II. Public POCs for CVE-2026-28445
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-28445 (1)
Vendor Advisories for CVE-2026-28445 (1)
Vendor Pages for CVE-2026-28445 (1)
Same Patch Batch · baptisteArno · 2026-05-22 · 11 CVEs total
| CVE-2026-33712 | 10.0 CRITICAL | TypeBot: Unauthenticated SSRF via isolated-vm fetch in preview chat endpoint bypasses SSRF |
| CVE-2026-39965 | 7.7 HIGH | TypeBot: SSRF via Open Redirect Bypass in HTTP Request and Code Blocks |
| CVE-2026-34207 | 7.6 HIGH | TypeBot: SSRF Protection Bypass via DNS-Resolved Hostnames in Webhook / HTTP Request Valid |
| CVE-2026-39968 | 7.1 HIGH | TypeBot: Cross-Workspace Credential Theft via Bot-Engine Preview Endpoint |
| CVE-2026-28444 | 6.5 MEDIUM | Typebot: IDOR in Result Logs Endpoint Allows Cross-Workspace Data Disclosure |
| CVE-2026-39966 | 6.5 MEDIUM | TypeBot: Async filter() bypasses authorization, allowing IDOR in getLinkedTypebots and lea |
| CVE-2026-39969 | 6.5 MEDIUM | TypeBot: WhatsApp Webhook Endpoint Missing Signature Verification |
| CVE-2026-39964 | 5.4 MEDIUM | TypeBot: Stored XSS via javascript: URI in text bubble links — bot author executes JS on v |
| CVE-2026-39967 | 3.1 LOW | TypeBot: Cross-Typebot Result Data Access via Missing typebotId Filter |
| CVE-2026-39970 | TypeBot: Stored Cross-Site Scripting (XSS) via SVG File Upload On Profile Picture Form |
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