Auth bypass in Baptistearno Typebot.io

CVE-2026-62861

TypeBot is a chatbot builder tool. Prior to 3.18.0, any authenticated non-guest workspace member can remove another workspace's public custom domain and make typebots on that domain unavailable. The custom-domain delete handler in handleDeleteCustomDomain.ts authorizes a caller against a client-supplied workspaceId but sends the client-supplied domain name to the shared Vercel project before verifying that the domain belongs to that workspace. This issue is fixed in version 3.18.0.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Affected products

Baptistearno Typebot.io — versions < 3.18.0

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key
CWE-862 — Missing Authorization

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)