{"schema":"threatline.record/2","record":{"id":"CVE-2026-93363","aliases":["GHSA-mc8m-rr6c-r5qr"],"summary":"Payload CMS storage-vercel-blob Adapter Improper Access Control on Upload Route","details":"The @payloadcms/storage-vercel-blob storage adapter for Payload contains an improper access control vulnerability that allows authenticated users to bypass collection-level permissions by accessing the client-upload route directly. Attackers can upload files through the client-upload endpoint without possessing the required collection access permissions, circumventing the intended access control enforcement.","categories":["Unclassified"],"product":"payload","vendor":"payloadcms","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93363","source_modified_at":"2026-10-01T15:22:00.369Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"payload","vendor":"payloadcms","versions":[{"status":"affected","version":"3.25.0","versionType":"semver","lessThan":"3.90.0"},{"status":"affected","version":"4.0.0-canary.0","versionType":"custom","lessThan":"4.0.0-canary.34"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93363","source_modified_at":"2026-10-01T15:22:00.369Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"payload","ecosystem":null},"version":"3.90.0","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93363","source_modified_at":"2026-10-01T15:22:00.369Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"payload","ecosystem":null},"version":"4.0.0-canary.34","basis":"first unaffected version stated in the CVE record"}],"cvss":5.3,"severity":"Medium","kev":{"listed":false},"epss":{"probability":0.00177,"percentile":0.06881,"score_date":"2026-10-23"},"published_at":"2026-09-25T16:53:12.583Z","modified_at":"2026-10-01T15:22:00.369Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-93363","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-10-01T15:22:00.369Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-93363","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/payloadcms/payload/security/advisories/GHSA-mc8m-rr6c-r5qr","tags":["vendor-advisory"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/payload-cms-storage-vercel-blob-adapter-improper-access-control-on-upload-route","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"partial","assessed_at":"2026-09-25T17:06:56.287708Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-01T15:22:00.369Z","content_hash":"89bf1359be65ae66fac110844f1753196f014037763bec841a10f576f765c0cb"}}