Improper Access Control in Payload CMS Storage Adapter
CVE-2026-93363

5.3MEDIUM

Key Information:

Vendor

Payloadcms

Status
Payload
Vendor
CVE Published:
25 September 2026

What is CVE-2026-93363?

The Payload CMS storage Vercel blob storage adapter is vulnerable due to improper access control, which enables authenticated users to bypass the established collection-level permissions. By accessing the client-upload route directly, attackers can upload files without possessing the necessary permissions, effectively undermining the intended access control mechanisms. This vulnerability poses significant risks, as it allows unauthorized file uploads that could lead to further exploitation of the system.

Affected Version(s)

payload 3.25.0 < 3.90.0

payload 4.0.0-canary.0 < 4.0.0-canary.34

References

https://github.com/payloadcms/payload/security/advisories...
vendor-advisory
https://www.vulncheck.com/advisories/payload-cms-storage-...
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Saidakbarxon Maxsudxonov
.