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CVE-2026-73406— Budibase: Unauthenticated user information disclosure via public tenant user lookup endpoint

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公司开源的一款低代码应用构建平台。 Budibase 3.39.32之前版本存在信息泄露漏洞，该漏洞源于/api/global/users/tenant/:id端点被列入公共端点且tenantUserLookup返回完整用户文档，可能导致未经身份验证的攻击者查询邮箱或用户标识，区分现有用户与缺失用户，并获取租户标识、用户标识、邮箱地址、SSO标识和文档修订元数据。

CVSS 7.5 · High EPSS 0.51% · P41

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 1

VendorProduct Version RangeStatus
Budibase budibase < 3.39.32 affected
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I. Basic Information for CVE-2026-73406

Vulnerability Information
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Vulnerability Title
Budibase: Unauthenticated user information disclosure via public tenant user lookup endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
Budibase is an open-source low-code platform. Prior to 3.39.32, GET /api/global/users/tenant/:id was listed in PUBLIC_ENDPOINTS in packages/worker/src/api/index.ts, and tenantUserLookup returned a full PlatformUser document. An unauthenticated caller could query an email or user identifier, distinguish existing users from missing users, and obtain tenant identifiers, user identifiers, email addresses, SSO identifiers, and document revision metadata. This issue is fixed in version 3.39.32.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Budibase 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Budibase是英国Budibase公司开源的一款低代码应用构建平台。 Budibase 3.39.32之前版本存在信息泄露漏洞，该漏洞源于/api/global/users/tenant/:id端点被列入公共端点且tenantUserLookup返回完整用户文档，可能导致未经身份验证的攻击者查询邮箱或用户标识，区分现有用户与缺失用户，并获取租户标识、用户标识、邮箱地址、SSO标识和文档修订元数据。
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 < 3.39.32 -

II. Public POCs for CVE-2026-73406

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8915 chars
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In-depth vulnerability mechanism
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III. Intelligence Information for CVE-2026-73406

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Patches & Fixes for CVE-2026-73406 (2)

Vendor Advisories for CVE-2026-73406 (1)

Other References for CVE-2026-73406 (1)

Same Patch Batch · Budibase · 2026-08-12 · 9 CVEs total

CVE-2026-73300 9.6 CRITICAL Budibase: SQL Injection via `multipleStatements: true`
CVE-2026-73407 9.0 CRITICAL Budibase: Unauthenticated REST Datasource Credential Theft via Cross-Origin Auth Leak (byp
CVE-2026-73303 8.2 HIGH Budibase: Email Change IDOR via POST /api/v2/email allows full Account Takeover (accountId
CVE-2026-73308 5.7 MEDIUM Budibase: OAuth2 Token Disclosure via Automation Test Results Broadcast to Other Builders
CVE-2026-73306 5.3 MEDIUM Budibase: Account Enumeration via Login Lockout Response Differential
CVE-2026-73409 5.1 MEDIUM Budibase: Server Filesystem Existence/Read Oracle via Builder-Controlled MongoDB tlsCertif
CVE-2026-73307 4.9 MEDIUM Budibase: SSRF via bare fetch() in uploadUrl during AI table generation
CVE-2026-73301 4.3 MEDIUM Budibase: Missing RBAC on GET /api/global/groups allows BASIC users to enumerate all tenan

IV. Related Vulnerabilities

Same product: budibase
Same vendor: Budibase
Same weakness: CWE-200

V. Comments for CVE-2026-73406

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