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.
INFO
Published Date :
June 26, 2026, 8:36 p.m.
Last Modified :
June 26, 2026, 8:36 p.m.
Remotely Exploit :
No
Source :
GitHub_M
Affected Products
The following products are affected by CVE-2026-50136
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update Budibase application server to version 3.39.3.
- Ensure all workspaces use updated application server.
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CVE-2026-50136 vulnerability anywhere in the article.