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CVE-2026-28445— Typebot: Stored XSS via Rating Block Custom Icon Bypasses isUnsafe Sandbox in Builder Preview

CVSS 8.7 · High EPSS 0.03% · P9

Affected Version Matrix 1

VendorProductVersion RangeStatus
baptisteArnotypebot.io< 3.16.0affected
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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)

Affected Products

VendorProductAffected VersionsCPESubscribe
baptisteArnotypebot.io < 3.16.0 -

II. Public POCs for CVE-2026-28445

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III. Intelligence Information for CVE-2026-28445

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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-2026-3371210.0 CRITICALTypeBot: Unauthenticated SSRF via isolated-vm fetch in preview chat endpoint bypasses SSRF
CVE-2026-399657.7 HIGHTypeBot: SSRF via Open Redirect Bypass in HTTP Request and Code Blocks
CVE-2026-342077.6 HIGHTypeBot: SSRF Protection Bypass via DNS-Resolved Hostnames in Webhook / HTTP Request Valid
CVE-2026-399687.1 HIGHTypeBot: Cross-Workspace Credential Theft via Bot-Engine Preview Endpoint
CVE-2026-284446.5 MEDIUMTypebot: IDOR in Result Logs Endpoint Allows Cross-Workspace Data Disclosure
CVE-2026-399666.5 MEDIUMTypeBot: Async filter() bypasses authorization, allowing IDOR in getLinkedTypebots and lea
CVE-2026-399696.5 MEDIUMTypeBot: WhatsApp Webhook Endpoint Missing Signature Verification
CVE-2026-399645.4 MEDIUMTypeBot: Stored XSS via javascript: URI in text bubble links — bot author executes JS on v
CVE-2026-399673.1 LOWTypeBot: Cross-Typebot Result Data Access via Missing typebotId Filter
CVE-2026-39970TypeBot: Stored Cross-Site Scripting (XSS) via SVG File Upload On Profile Picture Form

IV. Related Vulnerabilities

Same product: typebot.io
Same vendor: baptisteArno
Same weakness: CWE-79

V. Comments for CVE-2026-28445

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