Vulnerability · Published Sep 25, 2026 · Assigned by VulnCheck
CVE-2026-93363Payload CMS storage-vercel-blob Adapter Improper Access Control on Upload Route
Medium 4.3
In plain English
A medium-severity missing authorization in payload from payloadcms. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @payloadcms/storage-vercel-blob | 3.90.0 | GHSA-mc8m-rr6c-r5qr |
| npm | @payloadcms/storage-vercel-blob | 4.0.0-canary.34 | GHSA-mc8m-rr6c-r5qr |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| payloadcms | payload | 3.25.0 – before 3.90.04.0.0-canary.0 – before 4.0.0-canary.34 |
Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N