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CVE-2026-39969— TypeBot: WhatsApp Webhook Endpoint Missing Signature Verification

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及之前版本存在安全漏洞，该漏洞源于WhatsApp Cloud API webhook端点未验证x-hub-signature-256 HMAC签名，可能导致未认证攻击者发送伪造的webhook消息。以下版本受到影响：3.16.0及之前版本。

CVSS 6.5 · Medium EPSS 0.16% · P4

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
baptisteArno typebot.io < 3.17.0 affected
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I. Basic Information for CVE-2026-39969

Vulnerability Information
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Vulnerability Title
TypeBot: WhatsApp Webhook Endpoint Missing Signature Verification
Source: CVE Program / CVE List V5
Vulnerability Description
TypeBot is a chatbot builder tool. In versions 3.16.0 and prior, the WhatsApp Cloud API webhook endpoint (POST /v1/workspaces/{workspaceId}/whatsapp/{credentialsId}/webhook) does not verify the x-hub-signature-256 HMAC signature included by Meta in every webhook delivery. The webhook URL exposes both workspaceId and credentialsId as path parameters, which are logged in web server access logs, visible in Meta's webhook configuration dashboard, and potentially shared when configuring integrations. This allows any unauthenticated attacker to send spoofed webhook messages to trigger bot flows, consume API resources, and interact with external services using the workspace owner's credentials. The issue has been fixed in version 3.17.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
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及之前版本存在安全漏洞，该漏洞源于WhatsApp Cloud API webhook端点未验证x-hub-signature-256 HMAC签名，可能导致未认证攻击者发送伪造的webhook消息。以下版本受到影响：3.16.0及之前版本。
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 < 3.17.0 -

II. Public POCs for CVE-2026-39969

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III. Intelligence Information for CVE-2026-39969

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Vendor Advisories for CVE-2026-39969 (1)

Vendor Pages for CVE-2026-39969 (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-2026-39964 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
Same vendor: baptisteArno
Same weakness: CWE-287

V. Comments for CVE-2026-39969

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