CVE-2026-93363

Medium

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.

SeverityMedium

CVSS4.3

Exploit probability—

Product@payloadcms/storage-vercel-blob

PublishedSep 25, 2026

First seenSep 25, 2026

Weakness typeCWE-862Missing authorization

How to fix

Update

@payloadcms/storage-vercel-blob3.90.0, 4.0.0-canary.34 or later

Vendor advisories

github.com/payloadcms/payload/security/advisories/GHSA-mc8m-rr6c-r5qr

Affected products

Product	Affected versions	Fixed in
@payloadcms/storage-vercel-blobnpm	3.25.0 ≤ v < 3.90.0, 4.0.0-canary.0 ≤ v < 4.0.0-canary.34	3.90.0, 4.0.0-canary.34

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