{"id":"CVE-2026-50136","aliases":["GHSA-jj36-r9w3-3pfh"],"url":"https://o3.security/vulnerability/CVE-2026-50136","summary":"Budibase: Unauthenticated S3 signed upload URL generation allows arbitrary writes with stored datasource credentials","details":"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.","published":"2026-06-26T20:36:54.016Z","modified":"2026-08-12T03:51:36.701902089Z","cvss":{"score":7.4,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L"},"epss":{"score":0.00198,"percentile":0.09783,"asOf":"2026-08-10"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"@budibase/server","fixedVersion":"3.39.2"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/Budibase/budibase/security/advisories/GHSA-jj36-r9w3-3pfh"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50136.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50136"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:36.701902089Z"}}