CVE-2026-93363 Payload CMS storage-vercel-blob Adapter Improper Access Control on Upload Route
Authenticated users can bypass collection permissions to upload files via the client-upload route in the Payload CMS Vercel Blob adapter.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-93363?
CVE-2026-93363 is a medium-severity missing authorization vulnerability in payloadcms payload, published on 25 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Weakness: CWE-862
Which versions are affected by CVE-2026-93363?
How do I fix CVE-2026-93363?
No fix has been published for CVE-2026-93363 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-93363 being exploited?
There is no known exploitation of CVE-2026-93363 in the wild and no public exploit code.
Sources
Also known as GHSA-mc8m-rr6c-r5qr.