CVE-2026-28445— Typebot: Stored XSS via Rating Block Custom Icon Bypasses isUnsafe Sandbox in Builder Preview
Possible ATT&CK Techniques 2AI
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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/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
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 |
IV. Related Vulnerabilities
Same product: typebot.io
- CVE-2026-39969
TypeBot: WhatsApp Webhook Endpoint Missing Signature Verific - CVE-2026-39967
TypeBot: Cross-Typebot Result Data Access via Missing typebo - CVE-2026-39968
TypeBot: Cross-Workspace Credential Theft via Bot-Engine Pre - CVE-2026-39966
TypeBot: Async filter() bypasses authorization, allowing IDO - CVE-2026-39970
TypeBot: Stored Cross-Site Scripting (XSS) via SVG File Uplo
Same vendor: baptisteArno
- CVE-2026-39969
TypeBot: WhatsApp Webhook Endpoint Missing Signature Verific - CVE-2026-39967
TypeBot: Cross-Typebot Result Data Access via Missing typebo - CVE-2026-39968
TypeBot: Cross-Workspace Credential Theft via Bot-Engine Pre - CVE-2026-39966
TypeBot: Async filter() bypasses authorization, allowing IDO - CVE-2026-39970
TypeBot: Stored Cross-Site Scripting (XSS) via SVG File Uplo
Same weakness: CWE-79
- CVE-2026-4334
Shariff Wrapper <= 4.6.20 - Authenticated (Contributor+) Cro - CVE-2024-47097
Reflected Cross-Site Scripting in Follet School Solutions De - CVE-2024-47096
Reflected Cross-Site Scripting in Follet School Solutions De - CVE-2026-7052
HT Contact Form <= 2.8.2 - Unauthenticated Stored Cross-Site - CVE-2026-7660
Easy Updates Manager <= 9.0.20 - Reflected Cross-Site Script
V. Comments for CVE-2026-28445
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