CVE-2026-39964— TypeBot: Stored XSS via javascript: URI in text bubble links — bot author executes JS on visitors' browsers
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 3.16.0之前版本存在安全漏洞，该漏洞源于Typebot查看器在渲染富文本气泡内容中的锚标签时未过滤javascript: URI方案，可能导致JavaScript代码执行。以下版本受到影响：3.16.0之前版本。
Possible ATT&CK Techniques 1 AI
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-2026-39964
Vulnerability Information
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Vulnerability Title
TypeBot: Stored XSS via javascript: URI in text bubble links — bot author executes JS on visitors' browsers
Source: CVE Program / CVE List V5
Vulnerability Description
TypeBot is a chatbot builder tool. In versions prior to 3.16.0, the Typebot viewer (packages/embeds/js) renders anchor tags from rich text bubble content without filtering the javascript: URI scheme. A bot author can set a link URL to javascript:PAYLOAD, which executes in the visitor's browser context when clicked. Since the viewer is typically embedded in a third-party site, the attacker's JavaScript runs in the host page's origin and can exfiltrate cookies and session tokens. This can result in any authenticated Typebot user (including those on the free tier) being able to create a bot with this payload. Shared bots are publicly accessible — no victim authentication is required. This issue has been resolved 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:L/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
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 3.16.0之前版本存在安全漏洞，该漏洞源于Typebot查看器在渲染富文本气泡内容中的锚标签时未过滤javascript: URI方案，可能导致JavaScript代码执行。以下版本受到影响：3.16.0之前版本。
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-2026-39964
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-39964 (1)
Vendor Advisories for CVE-2026-39964 (1)
Vendor Pages for CVE-2026-39964 (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-2026-28445 | 8.7 HIGH | Typebot: Stored XSS via Rating Block Custom Icon Bypasses isUnsafe Sandbox in Builder Prev |
| 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-2026-39967 | 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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V. Comments for CVE-2026-39964
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