CVE-2026-93363

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

State: Published
Severity: 5.3 Medium
Published: Sep 25, 2026
Updated: Oct 1, 2026
Reserved: Sep 17, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	5.3 Medium	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	VulnCheck
3.1	4.3 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N	VulnCheck

Weaknesses

CWE-862 Missing Authorization

Affected Products

Product	Versions
payloadpayloadcms	3.25.0 to before 3.90.0Affected 4.0.0-canary.0 to before 4.0.0-canary.34Affected

References

GitHub Security Advisory (GHSA-mc8m-rr6c-r5qr)vendor-advisory
https://www.vulncheck.com/advisories/payload-cms-storage-vercel-blob-adapter-improper-access-control-on-upload-routethird-party-advisory

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