CVE-2026-93363CWE-862broken-access-control

CVE-2026-93363

Medium · published September 25, 2026

CVSS v3.1
4.3
EPSS
0%
Percentile
6.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CVSS v4.0
5.3 · 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
EPSS
0.00177 · 6.9th percentile
Weakness
CWE-862 · Missing Authorization
Published
2026-09-25T21:17Z
References (2)
https://github.com/payloadcms/payload/security/advisories/GHSA-mc8m-rr6c-r5qr · [email protected]https://www.vulncheck.com/advisories/payload-cms-storage-vercel-blob-adapter-improper-access-control-on-upload-route · [email protected]
EPSS history
Timeline
  • 27 SEP 03:28Z
    EPSS moved — → 0%
    epss
  • 25 SEP 16:53Z
    Payload CMS storage-vercel-blob Adapter Improper Access Control on Upload Route
    cvelistv5