baptisteArno typebot.io up to 3.15.x Preview Chat Endpoint startChat fetch authorization

Summaryinfo

A vulnerability has been found in baptisteArno typebot.io up to 3.15.x and classified as critical. This affects the function fetch of the file /api/v1/typebots/{typebotId}/preview/startChat of the component Preview Chat Endpoint. Performing a manipulation results in authorization. This vulnerability is known as CVE-2026-33712. Remote exploitation of the attack is possible. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in baptisteArno typebot.io up to 3.15.x. It has been classified as critical. This affects the function fetch of the file /api/v1/typebots/{typebotId}/preview/startChat of the component Preview Chat Endpoint. The manipulation with an unknown input leads to a authorization vulnerability. CWE is classifying the issue as CWE-862. The product does not perform an authorization check when an actor attempts to access a resource or perform an action. 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 3.15.2 and prior, the preview chat endpoint (POST /api/v1/typebots/{typebotId}/preview/startChat) allows unauthenticated users to achieve Server-Side Request Forgery (SSRF) by supplying a custom typebot definition with server-side code blocks. The fetch function exposed inside the isolated-vm sandbox calls Node.js native fetch without the SSRF validation (validateHttpReqUrl) that protects the HTTP Request block. This bypasses all SSRF mitigations added after GHSA-8gq9-rw7v-3jpr. Exploitation of this unauthenticated SSRF vulnerability can lead to cloud credential theft, internal network access and data exfiltration for any self-hosted Typebot deployments and hosted services. This issue has been fixed in version 3.16.0.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-33712 since 03/23/2026. 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 of the vulnerability are known, but there is no available exploit.

Upgrading to version 3.16.0 eliminates this vulnerability. The upgrade is hosted for download at github.com.

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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

Website

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

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