CVE-2026-93363
Payload CMS storage-vercel-blob Adapter Improper Access Control on Upload Route
MEDIUM 5.3EPSS 0.2%
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.
- Affected
- payloadcms · payload
- CVSS v4.0 VULNCHECK
- 5.3 MEDIUM
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 - CVSS v3.1 VULNCHECK
- 4.3 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N - EPSS
- 0.18% chance of exploitation in the next 30 days, 7th percentile
- Published
- 2026-09-25
- Updated
- 2026-10-01
Proof-of-concept exploits (2)
- payloadcms/payload/security/advisories/GHSA-mc8m-rr6c-r5qr
- https://www.vulncheck.com/advisories/payload-cms-storage-vercel-blob-adapter-improper-acc…