CVE-2026-39966 Missing authorization in typebot.io
Authenticated users can read private bot definitions from other workspaces due to a broken authorization check in the API.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-39966?
CVE-2026-39966 is a medium-severity missing authorization vulnerability in baptisteArno typebot.io, published on 22 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-863
Which versions are affected by CVE-2026-39966?
How do I fix CVE-2026-39966?
No fix has been published for CVE-2026-39966 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-2026-39966 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-39966 exists.
Sources
Also known as GHSA-3fr5-999r-84qj.