CVE-2026-93363: Payloadcms Payload

Medium severity, CVSS 4.3. EPSS: 0.2% chance of exploitation in the next 30 days.

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 products

• Payloadcms Payload: from 3.25.0, before 3.90.0 (fixed in 3.90.0); from 4.0.0-canary.0, before 4.0.0-canary.34 (fixed in 4.0.0-canary.34)

Published 2026-09-25. Last modified 2026-09-30.