Executive brief
Budibase is a low-code application platform that manages user access through identity providers and invite systems. An attacker can claim admin or builder invites intended for another user by authenticating with an OIDC provider and asserting the victim's email address without verification, gaining full access to all apps, databases, and automations or causing the legitimate user to be locked out. This vulnerability allows complete takeover of Budibase tenants when admin invites are compromised.
Technical details
The vulnerability exists in the OIDC/SSO authentication path (sso.authenticate) introduced in version 3.41.0. When matching pending user invites to incoming SSO identities, the server looks up invites by email alone without verifying the email_verified flag or requiring an invite code from the attacker. An attacker can register at a trusted IdP with an unverified email matching a pending invite recipient and claim the invite through claimInviteAndSaveUser, which propagates all granted privileges including admin.global with no privilege restrictions, resulting in complete account takeover or tenant compromise.
Affected products
- Budibase Server 3.41.0 to 3.44.x
Timeline
- 2026-09-26: disclosed: CVE-2026-100684 published; advisory GHSA-35ch-57g2-3g98 published by Budibase security team
- 2026-09-26: patched: Fixed in version 3.45.0