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CVE-2026-45716— Budibase: Builder-to-Admin Privilege Escalation via onboardUsers Endpoint Without SMTP Configuration

Quick assessment

Affected
Budibase budibase
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Budibase是英国Budibase开源的一个用于在几分钟内创建内部应用程序、工作流和管理面板的低代码平台。 Budibase 3.38.1之前版本存在安全漏洞，该漏洞源于POST /api/global/users/onboard端点受workspaceBuilderOrAdmin中间件保护且未配置SMTP时绕过管理员限制的邀请流程直接创建用户，可能导致构建者级别用户创建全局管理员账户实现权限提升。

CVSS 8.8 · High EPSS 0.47% · P38

Possible ATT&CK Techniques 1 AI

T1136 · Create Account

Affected Version Matrix 1

VendorProduct Version RangeStatus
Budibase budibase < 3.38.1 affected
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I. Basic Information for CVE-2026-45716

Vulnerability Information
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Vulnerability Title
Budibase: Builder-to-Admin Privilege Escalation via onboardUsers Endpoint Without SMTP Configuration
Source: CVE Program / CVE List V5
Vulnerability Description
Budibase is an open-source low-code platform. Prior to 3.38.1, the POST /api/global/users/onboard endpoint is protected by workspaceBuilderOrAdmin middleware, allowing any user with builder permissions to access it. When SMTP email is not configured (the default for self-hosted Budibase instances), this endpoint bypasses the admin-restricted invite flow and directly creates users via bulkCreate, accepting arbitrary admin and builder role assignments from the request body. A builder-level user can create a new global admin account and receive the generated password in the response, achieving full privilege escalation. This vulnerability is fixed in 3.38.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
特权管理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Budibase 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Budibase是英国Budibase开源的一个用于在几分钟内创建内部应用程序、工作流和管理面板的低代码平台。 Budibase 3.38.1之前版本存在安全漏洞，该漏洞源于POST /api/global/users/onboard端点受workspaceBuilderOrAdmin中间件保护且未配置SMTP时绕过管理员限制的邀请流程直接创建用户，可能导致构建者级别用户创建全局管理员账户实现权限提升。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Budibase budibase < 3.38.1 -

II. Public POCs for CVE-2026-45716

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 10583 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-45716

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Vendor Advisories for CVE-2026-45716 (1)

Other References for CVE-2026-45716 (1)

Same Patch Batch · Budibase · 2026-05-27 · 20 CVEs total

CVE-2026-46425 9.9 CRITICAL Budibase: SCIM endpoints lack role-based authorization, BASIC users CRUD tenant users
CVE-2026-48150 9.0 CRITICAL Budibase: Workspace-scoped builder escalates to global admin via /api/public/v1/roles/assi
CVE-2026-45717 8.8 HIGH Budibase: `PUT /api/datasources/:datasourceId` is protected only by `TABLE/READ` permissio
CVE-2026-48153 8.5 HIGH Budibase: SSRF via OAuth2 token endpoint URL reaches internal hosts and cloud metadata
CVE-2026-48149 8.1 HIGH Budibase: Stored XSS in Text component: BASIC users execute JS in admin session via Markdo
CVE-2026-48152 8.1 HIGH Budibase: Basic app users can exfiltrate stored REST datasource auth by rewriting datasour
CVE-2026-46427 7.7 HIGH Budibase: Snowflake private key returned unmasked from datasource API to BASIC users
CVE-2026-45061 7.7 HIGH Budibase: SSRF via trivial `.tar.gz` substring bypass in Plugin URL upload (`/api/plugin`)
CVE-2026-48146 7.7 HIGH Budibase: SSRF via OAuth2 Config Validation — Missing fetchWithBlacklist Protection
CVE-2026-45548 7.7 HIGH Budibase: SSRF in AI Extract File Automation Step via Missing IP Blacklist Validation
CVE-2026-45715 7.7 HIGH Budibase: SSRF Bypass via HTTP Redirect in REST Datasource Integration
CVE-2026-46426 7.6 HIGH Budibase: Unrestricted Upload of File with Dangerous Type
CVE-2026-48151 7.5 HIGH Budibase: Webhook schema endpoint authorization bypass allows unauthenticated mutation of
CVE-2026-48147 6.5 MEDIUM Budibase: Unanchored Regex in `matchers.ts` Allows CSRF Bypass via Query String Injection
CVE-2026-45719 6.5 MEDIUM Budibase: CouchDB Reduce Injection via Unsanitized Calculation Parameter in V1 Views API
CVE-2026-45718 5.4 MEDIUM Budibase: Row Action Trigger Bypasses View Row Filter Security Boundary Allowing Action on
CVE-2026-46424 4.2 MEDIUM Budibase: Missing Cache Invalidation on Public API Role Unassignment Allows Revoked Users
CVE-2026-48128 Budibase: SSRF via User-Controlled queryId in Automation Execute Query Step
CVE-2026-48148 Budibase: Unvalidated VectorDB Host Parameter Enables SSRF

IV. Related Vulnerabilities

Same product: budibase
Same vendor: Budibase
Same weakness: CWE-269

V. Comments for CVE-2026-45716

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