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

Quick assessment

Affected
budibase server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Budibase 3.41.0 至 3.45.0 之前的版本中，@budibase/server 的 OIDC/SSO 登录路径存在身份验证绕过漏洞。在 函数中，当没有已存在的用户匹配传入的 SSO 主体（subject）时，服务器仅依据 IdP 断言的邮箱地址查找待处理的邀请用户，而未验证邀请码，也未检查 状态（ 检查仅用于保护对已存在账户的查找）。 攻击者若能在租户信任的 OIDC 身份提供方（IdP）上注册，并断言受害者被邀请的邮箱地址（即使 为 ），即可领取该待处理邀请，并继承该邀请所授予的所有权限，包括

CVSS 8.1 · High EPSS 0.33% · P24
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I. Basic Information for CVE-2026-100684

Vulnerability Information
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Vulnerability Title
Budibase Server 3.41.0 before 3.45.0 Authentication Bypass via OIDC
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
budibase server 3.41.0 ~ 3.45.0 -

II. Public POCs for CVE-2026-100684

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III. Intelligence Information for CVE-2026-100684

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Vendor Advisories for CVE-2026-100684 (1)

Other References for CVE-2026-100684 (1)

Same Patch Batch · budibase · 2026-09-26 · 9 CVEs total

CVE-2026-100682 8.8 HIGH Budibase Server before 3.45.0 Arbitrary File Write via ZIP Symlink
CVE-2026-100686 8.1 HIGH Budibase before 3.45.0 Cross-Workspace Privilege Escalation via POST /api/global/groups/:g
CVE-2026-100680 8.1 HIGH Budibase before 3.45.0 Arbitrary Local File Read via OpenAPI Import
CVE-2026-100683 8.0 HIGH Budibase before 3.45.0 SQL Injection via column-rename DDL
CVE-2026-100685 7.7 HIGH Budibase before 3.45.0 Information Disclosure via Chat Links
CVE-2026-100688 6.5 MEDIUM Budibase server before 3.45.0 Cross-Tenant Information Disclosure
CVE-2026-100687 5.5 MEDIUM Budibase Server before 3.45.0 Credential Exposure via External Table Broadcast
CVE-2026-100681 5.4 MEDIUM Budibase before 3.45.0 SSRF and OAuth Token Exfiltration via Teams Webhook

IV. Related Vulnerabilities

Same product: server
Same vendor: budibase
Same weakness: CWE-287

V. Comments for CVE-2026-100684

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