Auth bypass in Budibase Server
CVE-2026-72859
Budibase versions 3.39.4 before 3.40.0 contain an authorization regression in the S3 attachment upload endpoint that allows BASIC users to obtain S3 PutObject presigned URLs by sending POST requests to the attachments endpoint. The route was changed from a BUILDER permission check to a TABLE/WRITE check, which BASIC users hold by default. Attackers can specify arbitrary S3 buckets in the request body to generate presigned URLs for writing to any bucket accessible by the stored IAM credentials, enabling unauthorized file uploads.
Vulnerability class: Broken Access Control
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N.
Affected products
- Budibase Server — versions 3.39.4, 3.40.0
Weakness classification (CWE)
References
- disclosure@vulncheck.com (vendor-advisory)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-72859?
- CVE-2026-72859 is a high-severity vulnerability in Budibase Server, classified under Incorrect Authorization. CVSS score: 7.7/10. Published 2026-08-14.
- How severe is CVE-2026-72859?
- High severity. CVSS v3 base score is 7.7 out of 10.