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.
Exploitability
AV:NAC:LPR:LUI:NScope
S:CImpact
C:LI:LA:L7.4/CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:LAuthentication