baptisteArno typebot.io up to 3.15.x startChat Endpoint authorization

Summaryinfo

A vulnerability has been found in baptisteArno typebot.io up to 3.15.x and classified as problematic. This affects an unknown function of the component startChat Endpoint. This manipulation causes authorization. This vulnerability appears as CVE-2026-39967. The attack may be initiated remotely. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in baptisteArno typebot.io up to 3.15.x. It has been declared as problematic. Affected by this vulnerability is an unknown part of the component startChat Endpoint. The manipulation with an unknown input leads to a authorization vulnerability. The CWE definition for the vulnerability is CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. As an impact it is known to affect confidentiality. The summary by CVE is:

TypeBot is a chatbot builder tool. In versions 3.15.2 and prior, the bot engine's the findResult query does not filter results by typebotId, allowing an authenticated user to load result data (user answers, variable values) from a different typebot by supplying a foreign resultId to the startChat endpoint. Exploitation is constrained by CUID2's cryptographically random 24-character IDs (making brute-force infeasible), the requirement that rememberUser be enabled, and the need for matching variable names in the current typebot. If successfully exploited, an attacker can access the original user's previous answers, session variable values, and hasStarted flag, potentially exposing PII like names, emails, and phone numbers. This issue has been fixed in version 3.16.0.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-39967 since 04/08/2026. The exploitation appears to be difficult. The attack can be launched remotely. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 3.16.0 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 73162634e6bdebd37a1a571db4062d30854e0400 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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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

License

• open-source

Website

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

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