CVE-2026-93363GHSA-mc8m-rr6c-r5qr
Payload CMS storage-vercel-blob Adapter Improper Access Control on Upload Route
payloadcms payload
CVSS
5.3MediumExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.18%Chance of exploitation activity in the next 30 days, higher than 6% of CVEs. Scored 23 Oct 2026FIRST EPSS
What fixes it
A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.
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.
Text from CVE List
Affected versions 2
- payloadaffected: 3.25.0 before 3.90.0CVE List
- payloadaffected: 4.0.0-canary.0 before 4.0.0-canary.34CVE List