Vulnerability Description
TypeBot is a chatbot builder tool. In versions 3.15.2, the getLinkedTypebots API endpoint returns full bot definitions to any authenticated user who references a target bot ID in a Typebot Link block, regardless of workspace ownership, leading to IDOR. The authorization check uses Array.filter() with an async callback — since filter() is synchronous, the callback always returns a truthy Promise, so the access control predicate is never actually evaluated. Any authenticated Typebot user can read the full definition of any other workspace's private bots, including: all conversation blocks and logic flow, variable values embedded in the bot (credentials, API keys, PII), webhook URLs and integration configurations. This issue has been fixed in version 3.16.0.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/baptisteArno/typebot.io/commit/b9530a089b43bfa6e79e3ff9cbfab9
- https://github.com/baptisteArno/typebot.io/releases/tag/v3.16.0
- https://github.com/baptisteArno/typebot.io/security/advisories/GHSA-3fr5-999r-84
- https://github.com/baptisteArno/typebot.io/security/advisories/GHSA-3fr5-999r-84
FAQ
What is CVE-2026-39966?
CVE-2026-39966 is a vulnerability with a CVSS score of 6.5 (MEDIUM). TypeBot is a chatbot builder tool. In versions 3.15.2, the getLinkedTypebots API endpoint returns full bot definitions to any authenticated user who references a target bot ID in a Typebot Link block,...
How severe is CVE-2026-39966?
CVE-2026-39966 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-39966?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.