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CVE PROGRAM SOURCE RECORD7.4 High

CVE-2026-50136

Budibase: Unauthenticated S3 signed upload URL generation allows arbitrary writes with stored datasource credentials

Description

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 products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Budibase budibase

  • < 3.39.3affected

References