Medium severity · published Sep 25, 2026
CVE-2026-93363
Payload CMS storage-vercel-blob Adapter Improper Access Control on Upload Route
4.3
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 7% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PA
payload · payloadcms
3.25.0 before 3.90.0; 4.0.0-canary.0 before 4.0.0-canary.34 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-93363
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-93363
vendor-advisory
https://github.com/payloadcms/payload/security/advisories/GHSA-mc8m-rr6c-r5qr
third-party-advisory
https://www.vulncheck.com/advisories/payload-cms-storage-vercel-blob-adapter-improper-access-control-on-upload-route
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