---
id: CVE-2026-93363
title: >-
  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
summary: >-
  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. Attac…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N'
cwe:
  - CWE-862
vendor: payloadcms
product: payload
affected:
  - payload >= 3.25.0 < 3.90.0
  - payload >= 4.0.0-canary.0 < 4.0.0-canary.34
published: '2026-09-25'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T18:17:33.190'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93363'
references:
  - url: >-
      https://github.com/payloadcms/payload/security/advisories/GHSA-mc8m-rr6c-r5qr
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/payload-cms-storage-vercel-blob-adapter-improper-access-control-on-upload-route
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-25T17:06:56.287708Z'
ingestedAt: '2026-09-25T17:13:14.014Z'
---

## Overview

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

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.