CVE-2026-100684 Budibase Server 3.41.0 before 3.45.0 Authentication Bypass via OIDC

What is CVE-2026-100684?

CVE-2026-100684 is a critical authentication bypass vulnerability in budibase server, published on 26 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-287

Which versions are affected by CVE-2026-100684?

How do I fix CVE-2026-100684?

No fix has been published for CVE-2026-100684 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2026-100684 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-100684 exists.

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• GitHub advisory
• How this page is made

Also known as GHSA-35ch-57g2-3g98, GHSA-g8px-vqwp-7rg7.