high7.4
CVE-2026-50136
Budibase: Unauthenticated S3 signed upload URL generation allows arbitrary writes with stored datasource credentials
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | @budibase/server | < 3.39.2 | 3.39.2 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Budibase | Budibase | before 3.39.3 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-jj36-r9w3-3pfh
- https://github.com/Budibase/budibase/security/advisories/GHSA-jj36-r9w3-3pfh
- https://github.com/Budibase/budibase/pull/18774
- https://github.com/Budibase/budibase/commit/d9dbb7f6105373cc88ecacdbcab70c776f7dd6a1
- https://nvd.nist.gov/vuln/detail/CVE-2026-50136