CVE-2026-39969 TypeBot: WhatsApp Webhook Endpoint Missing Signature Verification
Unauthenticated attackers can spoof WhatsApp webhook messages to trigger bot flows and consume resources due to missing signature verification.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-39969?
CVE-2026-39969 is a medium-severity missing authorization vulnerability in baptisteArno typebot.io, published on 22 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Which versions are affected by CVE-2026-39969?
How do I fix CVE-2026-39969?
No fix has been published for CVE-2026-39969 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-39969 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-39969 exists.
Sources
Also known as GHSA-8vqp-r5w7-v47f.