{"id":"CVE-2026-93363","aliases":["EUVD-2026-87206","GHSA-mc8m-rr6c-r5qr"],"status":"published","title":"Payload CMS storage-vercel-blob Adapter Improper Access Control on Upload Route","description":"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.","severity":{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00177,"percentile":0.07267,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-862"],"published":"2026-09-25T16:53:12.583Z","modified":"2026-11-04T17:15:11Z","fixes":[{"ecosystem":"npm","package":"@payloadcms/storage-vercel-blob","fixed_in":["3.90.0","4.0.0-canary.34"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"@payloadcms/storage-vercel-blob","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.25.0"},{"fixed":"3.90.0"}]}]},{"source":"ghsa","ecosystem":"npm","package":"@payloadcms/storage-vercel-blob","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0-canary.0"},{"fixed":"4.0.0-canary.34"}]}]},{"source":"osv","ecosystem":"npm","package":"@payloadcms/storage-vercel-blob","ranges":[{"type":"SEMVER","events":[{"introduced":"3.25.0"},{"fixed":"3.90.0"}]}]},{"source":"osv","ecosystem":"npm","package":"@payloadcms/storage-vercel-blob","ranges":[{"type":"SEMVER","events":[{"introduced":"4.0.0-canary.0"},{"fixed":"4.0.0-canary.34"}]}]}],"products":[{"vendor":"payloadcms","product":"payload"}],"references":[{"url":"https://github.com/payloadcms/payload/security/advisories/GHSA-mc8m-rr6c-r5qr","tags":["vendor-advisory","advisory","web"]},{"url":"https://www.vulncheck.com/advisories/payload-cms-storage-vercel-blob-adapter-improper-access-control-on-upload-route","tags":["third-party-advisory","advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93363","tags":["advisory"]},{"url":"https://github.com/payloadcms/payload/commit/47abe9bb5c444330dbfaa9a5bc2033337932270b","tags":["web"]},{"url":"https://github.com/payloadcms/payload/releases/tag/v3.90.0","tags":["web"]},{"url":"https://github.com/advisories/GHSA-mc8m-rr6c-r5qr"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93363.json","tags":["advisory"]},{"url":"https://github.com/payloadcms/payload","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-93363","title":"Payload CMS storage-vercel-blob Adapter Improper Access Control on Upload Route","description":"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.","status":"published","published":"2026-09-25T16:53:12.583Z","modified":"2026-10-01T15:22:00.369Z","cvss":[{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"},{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-862"],"updated_at":"2026-11-02T14:19:54.122945Z"}],"euvd":[{"id":"EUVD-2026-87206","description":"@payloadcms/storage-vercel-blob has access control bypass of uploads in Vercel Storage adapter","status":"published","published":"2026-11-04T17:00:39Z","modified":"2026-11-04T17:00:39Z","cvss":[{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-04T18:12:44.477339Z"}],"ghsa":[{"id":"GHSA-mc8m-rr6c-r5qr","title":"@payloadcms/storage-vercel-blob has access control bypass of uploads in Vercel Storage adapter","description":"### Impact\nIn affected configurations, client upload access does not consistently align with the associated collection’s access configuration.\n\nYou are affected if:\n- You use client uploads with `@payloadcms/storage-vercel-blob`.\n- Authenticated users can access the client-upload route.\n\nApplications that do not enable client uploads are not affected.\n\n### Patches\nClient uploads now require authentication and the appropriate collection-level access before upload access is granted.\n\nUsers should upgrade Payload packages to `\u003e= 3.90.0` or `\u003e= 4.0.0-canary.34`.\n\n### Workarounds\nUpgrading to a patched version is recommended. Until you can upgrade, disable client uploads or configure the upload route’s access control to enforce the associated collection’s permissions.","status":"published","published":"2026-11-04T17:00:39Z","modified":"2026-11-04T17:00:40Z","cvss":[{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","level":"medium"},{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"medium"}],"cwes":["CWE-862"],"updated_at":"2026-11-04T17:24:03.876303Z"}],"nvd":[{"id":"CVE-2026-93363","description":"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.","status":"published","published":"2026-09-25T17:17:19.157Z","modified":"2026-09-30T17:31:44.573Z","cvss":[{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-862"],"updated_at":"2026-11-02T14:12:51.721923Z"}],"osv":[{"id":"CVE-2026-93363","title":"Payload CMS storage-vercel-blob Adapter Improper Access Control on Upload Route","description":"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.","status":"published","published":"2026-09-25T16:53:12.583Z","modified":"2026-10-28T02:31:01.12260592Z","cvss":[{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-862"],"updated_at":"2026-11-02T15:45:20.931171Z"},{"id":"GHSA-mc8m-rr6c-r5qr","title":"@payloadcms/storage-vercel-blob has access control bypass of uploads in Vercel Storage adapter","description":"### Impact\nIn affected configurations, client upload access does not consistently align with the associated collection’s access configuration.\n\nYou are affected if:\n- You use client uploads with `@payloadcms/storage-vercel-blob`.\n- Authenticated users can access the client-upload route.\n\nApplications that do not enable client uploads are not affected.\n\n### Patches\nClient uploads now require authentication and the appropriate collection-level access before upload access is granted.\n\nUsers should upgrade Payload packages to `\u003e= 3.90.0` or `\u003e= 4.0.0-canary.34`.\n\n### Workarounds\nUpgrading to a patched version is recommended. Until you can upgrade, disable client uploads or configure the upload route’s access control to enforce the associated collection’s permissions.","status":"published","published":"2026-11-04T17:00:39Z","modified":"2026-11-04T17:15:11.372441206Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"medium"},{"version":"4.0","score":5.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-862"],"updated_at":"2026-11-04T17:43:22.558805Z"}]}}