Vulnerability · Published May 22, 2026 · Assigned by GitHub_M

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

Medium 6.5

In plain English

A medium-severity improper authentication in typebot.io from baptisteArno. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.1%top 96.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
baptisteArno	typebot.io	< 3.17.0

Weakness: CWE-287, CWE-345 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

References

https://github.com/baptisteArno/typebot.io/security/advisories/GHSA-8vqp-r5w7-v47f x_refsource_CONFIRM
https://github.com/baptisteArno/typebot.io/releases/tag/v3.17.0 x_refsource_MISC