{"cve":"CVE-2026-50136","nvd":{"published":"2026-06-26T21:16:34.547","modified":"2026-06-30T19:40:07.617","status":"Analyzed","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3},"cwes":["CWE-306"],"references":["https://github.com/Budibase/budibase/security/advisories/GHSA-jj36-r9w3-3pfh","https://github.com/Budibase/budibase/security/advisories/GHSA-jj36-r9w3-3pfh"],"products":["budibase:budibase"],"source":"nvd","synced_at":"2026-10-19T22:41:17.107060303+00:00"},"epss":{"cve":"CVE-2026-50136","score":0.0029,"percentile":0.21629,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-jj36-r9w3-3pfh","url":"https://osv.dev/vulnerability/GHSA-jj36-r9w3-3pfh","summary":"Budibase: Unauthenticated S3 signed upload URL generation allows arbitrary writes with stored datasource credentials","modified":"2026-07-17T17:15:51.344099024Z","packages":[{"ecosystem":"npm","name":"@budibase/server","purl":"pkg:npm/%40budibase/server","ranges":["<3.39.2"],"fixed":["3.39.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}