Auth bypass in Budibase Server
CVE-2026-100688
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/Budibase/budibase/security/advisories/GHSA-4946-qf2m-wrh5 (vendor-advisory)
- www.vulncheck.com/advisories/budibase-server-before-3.45.0-cross-tenant-informa… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100688?
- CVE-2026-100688 is a medium-severity vulnerability in Budibase Server, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-09-26.
- How severe is CVE-2026-100688?
- Medium severity. CVSS v3 base score is 6.5 out of 10.