CVE-2026-100688
Received Received - Intake

Budibase Server Cross-Tenant Information Disclosure

Publication date: 2026-09-26

Last updated on: 2026-09-26

Assigner: VulnCheck

Description
Budibase server before 3.45.0 contains a cross-tenant information disclosure vulnerability in the GET /api/applications/:appId/appPackage endpoint that allows authenticated users to read another tenant's application metadata and source code. Attackers can supply a victim tenant's app id to retrieve sensitive application details including navigation structure, role names, internal screen URLs, JavaScript snippets, and user identifiers without authorization checks.

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Meta Information

Published
2026-09-26
Last Modified
2026-09-26
Generated
2026-09-26
AI Q&A
2026-09-26
EPSS Evaluated
N/A
NVD
CVE-2026-100688
EUVD
EUVD-2026-87661

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
budibase server to 3.45.0 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-639 The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

Attack-Flow Graph

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Executive Summary

This is a cross-tenant information disclosure vulnerability in Budibase server versions before 3.45.0. It allows authenticated users to access another tenant's application metadata and source code through the GET /api/applications/:appId/appPackage endpoint without proper authorization checks. Attackers can retrieve sensitive details like navigation structure, role names, internal screen URLs, JavaScript snippets, and user identifiers by supplying a victim tenant's app ID.

Detection Guidance

To detect this vulnerability, monitor network traffic for unauthorized requests to the GET /api/applications/:appId/appPackage endpoint. Check logs for repeated requests with different app IDs from the same user. Use tools like curl to test if the endpoint leaks sensitive data when accessed with a victim's app ID.

Impact Analysis

An attacker could exploit this to steal sensitive application details, including source code snippets and internal structure, which may help them plan further attacks. While it exposes metadata and authorization models, it does not directly disclose row data, datasource credentials, or additional PII. The impact is higher for tenants with custom applications containing proprietary logic or sensitive configurations.

Compliance Impact

This vulnerability could lead to non-compliance with GDPR due to unauthorized access to user identifiers and potential exposure of personal data within application metadata. For HIPAA, if the application contains health-related data, the breach of internal structure and role names may violate safeguards for protected health information. Organizations must assess data exposure and report breaches as required.

Mitigation Strategies

Upgrade Budibase server to version 3.45.0 or later immediately. Ensure all authenticated users are verified and restrict access to sensitive endpoints. Review logs for suspicious activity and apply tenant isolation checks to prevent cross-tenant data exposure.

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