Budibase up to 3.39.31 User Lookup API Endpoint index.ts tenantUserLookup ID information disclosure

Summaryinfo

A vulnerability labeled as problematic has been found in Budibase up to 3.39.31. The affected element is the function tenantUserLookup of the file packages/worker/src/api/index.ts of the component User Lookup API Endpoint. Such manipulation of the argument ID leads to information disclosure. This vulnerability is uniquely identified as CVE-2026-73406. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Budibase up to 3.39.31. Affected by this issue is the function tenantUserLookup of the file packages/worker/src/api/index.ts of the component User Lookup API Endpoint. The manipulation of the argument id with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-73406 since 08/12/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1592.

Upgrading to version 3.39.32 eliminates this vulnerability.

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Productinfo

Name

• Budibase

Version

• 3.39.0
• 3.39.1
• 3.39.2
• 3.39.3
• 3.39.4
• 3.39.5
• 3.39.6
• 3.39.7
• 3.39.8
• 3.39.9
• 3.39.10
• 3.39.11
• 3.39.12
• 3.39.13
• 3.39.14
• 3.39.15
• 3.39.16
• 3.39.17
• 3.39.18
• 3.39.19
• 3.39.20
• 3.39.21
• 3.39.22
• 3.39.23
• 3.39.24
• 3.39.25
• 3.39.26
• 3.39.27
• 3.39.28
• 3.39.29
• 3.39.30
• 3.39.31

Website

• Product: https://github.com/Budibase/budibase/

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