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9.2

Budibase Server lets attacker claim invited accounts via SSO

CVE-2026-100684 · published 15 days ago
Summary

Versions of Budibase Server from 3.41.0 up to but not including 3.45.0 let someone who can control a trusted login provider sign in as an invited user without a proper invitation code or email verification. This can give the attacker the same rights as the invited user, including full administrative control of the tenant. Upgrade to version 3.45.0 or later, or remove any pending invitations until the upgrade is applied.

What to do
  • Update budibase server to version 3.45.0 or later.
Affected software
VendorProductAffected versions
budibase server < 3.45.0
Original advisory text
Budibase Server 3.41.0 before 3.45.0 Authentication Bypass via OIDC
Budibase versions 3.41.0 before 3.45.0 contain an authentication bypass in the OIDC/SSO login path of @budibase/server. In sso.authenticate, when no existing user matches the incoming SSO subject, the server looks up pending user invites by the IdP-asserted email address alone — without validating an invite code and without an email_verified check (the email_verified gate protects only the existing-account lookup). An attacker who can register at an IdP that the tenant trusts for OIDC and assert a victim's invited email address (even with email_verified=false) claims the pending invite and inherits all of its granted privileges, including builder and admin.global, with no admin exclusion. This results in takeover of the invited principal and, for admin invites, full tenant compromise (access to all apps, datasources including production credentials, and automations); the invite is consumed, denying onboarding to the legitimate invitee.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
9.2 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-287Improper Authentication
Timeline
Published26 Sep 2026
Updated11 Oct 2026
First seen26 Sep 2026
Sources
CVE-2026-100684 · NVD
CVE-2026-100684 · MITRE
CVE-2026-100684 · OSV
GHSA-35ch-57g2-3g98 · GHSA
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