CVE-2026-72859
Budibase 3.39.4 before 3.40.0 Authorization Regression via S3 Presigned URL
CVSS Score
7.7
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-863 |
| Vendor | budibase |
| Product | server |
| Published | Aug 14, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
High
Availability
None
Affected Versions
budibase / server
3.39.4 < 3.40.0
References
Credits
🔍 DavidCarliez