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 · last modified .
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
EPSS: 0.003 (26.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 26.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.001
Affected products
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-4946-qf2m-wrh5) (vendor-advisory)
- VulnCheck Advisory: Budibase server before 3.45.0 Cross-Tenant Information Disclosure (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.