baptisteArno typebot.io up to 3.16.x Webhook Message webhook improper authentication

Summaryinfo

A vulnerability was found in baptisteArno typebot.io up to 3.16.x. It has been classified as critical. Affected is an unknown function of the file /v1/workspaces/{workspaceId}/whatsapp/{credentialsId}/webhook of the component Webhook Message Handler. Performing a manipulation results in improper authentication. This vulnerability is known as CVE-2026-39969. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical has been found in baptisteArno typebot.io up to 3.16.x. This affects an unknown code block of the file /v1/workspaces/{workspaceId}/whatsapp/{credentialsId}/webhook of the component Webhook Message Handler. The manipulation with an unknown input leads to a improper authentication vulnerability. CWE is classifying the issue as CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-39969 since 04/08/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available.

Upgrading to version 3.17.0 eliminates this vulnerability. The upgrade is hosted for download at github.com.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-31485). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• baptisteArno

Name

• typebot.io

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8
• 3.9
• 3.10
• 3.11
• 3.12
• 3.13
• 3.14
• 3.15
• 3.16

Website

• Product: https://github.com/baptisteArno/typebot.io/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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