CVE-2026-50136
Budibase: Unauthenticated S3 signed upload URL generation allows arbitrary writes with stored datasource credentials
MEDIUM 5.3EPSS 0.3%
Budibase is an open-source low-code platform. Prior to 3.39.3, the application server exposes an unauthenticated endpoint that generates S3 PutObject presigned URLs using credentials stored in a workspace datasource. The route is protected only by the recaptcha middleware and does not require authentication, table permission, datasource permission, or builder access. A public caller who knows a workspace ID and S3 datasource ID can request a signed upload URL for attacker-controlled bucket and key values. This vulnerability is fixed in 3.39.3.
- Affected
- Budibase · budibase
- CVSS v3.1 NVD
- 5.3 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N - CVSS v3.1 GITHUB
- 7.4 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L - EPSS
- 0.29% chance of exploitation in the next 30 days, 20th percentile
- Published
- 2026-06-26
- Updated
- 2026-06-27