CVE-2026-93363

Payload CMS storage-vercel-blob Adapter Improper Access Control on Upload Route

Published Sep 25, 2026 CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-mc8m-rr6c-r5qr @payloadcms/storage-vercel-blob has access control bypass of uploads in Vercel Storage adapter
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
CPEs cpe:2.3:a:payloadcms:payload:*:*:*:*:*:*:*:*
Type Values Removed Values Added
First Time appeared Payloadcms
Payloadcms payload
Vendors & Products Payloadcms
Payloadcms payload
Type Values Removed Values Added
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.
Title Payload CMS storage-vercel-blob Adapter Improper Access Control on Upload Route
Weaknesses CWE-862
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N'}

cvssV4_0

{'score': 5.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Oct 1, 2026, 3:22 PM
Reserved
Sep 17, 2026, 6:41 PM
Status
Awaiting Analysis
Published
Sep 25, 2026, 5:17 PM
Modified
Sep 30, 2026, 5:31 PM