What’s Vulnerable › Vulnerabilities

CVE-2026-93363: Payload CMS storage-vercel-blob Adapter Improper Access Control on Upload Route

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-25 · updated 2026-09-30
• Weakness: CWE-862

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.

Affected products

• payloadcms payload: from 3.25.0 before 3.90.0; from 4.0.0-canary.0 before 4.0.0-canary.34 — fixed in 3.90.0, 4.0.0-canary.34

How to fix

Upgrade to a fixed version: payloadcms payload 3.90.0, 4.0.0-canary.34. Check the vendor advisory for mitigations.

References

• https://github.com/payloadcms/payload/security/advisories/GHSA-mc8m-rr6c-r5qr
• https://www.vulncheck.com/advisories/payload-cms-storage-vercel-blob-adapter-improper-access-control-on-upload-route

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