EUVD-2026-87657
GHSA-g8px-vqwp-7rg7
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network, unauthenticated bypass, but AC:H because it needs a trusted-IdP relationship plus an existing unclaimed invite; admin takeover yields full C/I/A over the tenant.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
5DescriptionCVE.org
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.
Articles & Coverage 1
AnalysisAI
Unauthenticated account takeover of pending invited users in Budibase Server (@budibase/server) versions 3.41.0 through 3.45.0, caused by an authentication bypass in the OIDC/SSO login path. In sso.authenticate, when no existing user matches the incoming SSO subject, the server resolves pending invites using only the IdP-asserted email address, skipping both invite-code validation and the email_verified check (which guards only the existing-account lookup), so anyone who can register at a trusted IdP and claim a victim's invited email - even with email_verified=false - consumes the invite and inherits its privileges, including builder and admin.global roles. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires all of the following: OIDC/SSO login must be enabled and configured against an identity provider the tenant trusts; the attacker must be able to register (or already control) an account at that IdP and assert an arbitrary email address - including one with email_verified=false, since the email_verified gate protects only the existing-account lookup, not the pending-invite lookup; and an unclaimed pending user invite must exist for the targeted email. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine high-priority authentication bypass, though not a mass-exploitation event. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade Budibase Server to version 3.45.0 or later, which is the vendor-released fix (patch available per vendor; see GHSA-35ch-57g2-3g98 at https://github.com/Budibase/budibase/security/advisories/GHSA-35ch-57g2-3g98 and the VulnCheck advisory at https://www.vulncheck.com/advisories/budibase-server-3.41.0-before-3.45.0-authentication-bypass-via-oidc). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all @budibase/server instances and identify any running versions 3.41.0 through 3.45.0; apply the vendor patch (Patch available per vendor advisory) to move outside the affected version range, prioritizing internet-facing or SSO-enabled tenants; if immediate patching is not possible, temporarily disable OIDC/SSO login or block new SSO invite acceptance, and audit and revoke all unclaimed pending invites, especially those with builder or admin.global roles. …
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Same weakness CWE-287 – Improper Authentication
View allSame technique Authentication Bypass
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External POC / Exploit Code
Leaving vuln.today