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TI-2026-62944 Aliases CVE-2026-93363GHSA-mc8m-rr6c-r5qr

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

Priority LOW 23CWE-862Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-862.

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. Attackers can upload files through the client-upload endpoint without possessing the required collection access permissions, circumventing the intended access control enforcement.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00177 7th percentileScored 2026-11-07
Fix Fixed payload (payloadcms): 3.90.0, 4.0.0-canary.34@payloadcms/storage-vercel-blob (npm): 3.90.0, 4.0.0-canary.34

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
payloadcmspayload3.25.0 to before 3.90.0; 4.0.0-canary.0 to before 4.0.0-canary.343.90.0, 4.0.0-canary.34Patch availableCNA
—@payloadcms/storage-vercel-blob (npm)3.25.0 to before 3.90.03.90.0Patch availableGHSA-mc8m-rr6c-r5qr
—@payloadcms/storage-vercel-blob (npm)4.0.0-canary.0 to before 4.0.0-canary.344.0.0-canary.34Patch availableGHSA-mc8m-rr6c-r5qr
  • payload Vendorpayloadcms Affected 3.25.0 to before 3.90.0; 4.0.0-canary.0 to before 4.0.0-canary.34 Fixed in 3.90.0, 4.0.0-canary.34 Patch available CNA
  • @payloadcms/storage-vercel-blob (npm) Vendor— Affected 3.25.0 to before 3.90.0 Fixed in 3.90.0 Patch available GHSA-mc8m-rr6c-r5qr
  • @payloadcms/storage-vercel-blob (npm) Vendor— Affected 4.0.0-canary.0 to before 4.0.0-canary.34 Fixed in 4.0.0-canary.34 Patch available GHSA-mc8m-rr6c-r5qr

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:payloadcms:payload:*:*:*:*:*:*:*:*——payloadcms
  • cpe:2.3:a:payloadcms:payload:*:*:*:*:*:*:*:* Versions — — ·payloadcms

Remediation

  • Fix · CNA payload (payloadcms) Fixed in 3.90.0, 4.0.0-canary.34
  • Fix · GHSA-mc8m-rr6c-r5qr @payloadcms/storage-vercel-blob (npm) Fixed in 3.90.0 Advisory →
  • Fix · GHSA-mc8m-rr6c-r5qr @payloadcms/storage-vercel-blob (npm) Fixed in 4.0.0-canary.34 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-93363
  2. 2026-11-04 Alias added: GHSA-mc8m-rr6c-r5qr
  3. 2026-11-04 Fix available: npm/@payloadcms/[email protected], npm/@payloadcms/[email protected] · GHSA-mc8m-rr6c-r5qr
  4. 2026-11-04 CVSS score added · GHSA-mc8m-rr6c-r5qr
  5. 2026-11-04 Weakness changed · GHSA-mc8m-rr6c-r5qr
  6. 2026-11-04 5 new references · GHSA-mc8m-rr6c-r5qr

References

Advisory 2

Other 3

  • TI-2026-10166 PayloadCMS 3.84.1 - Authenticated account lockout bypass through default unlock access CVSS 4.0MEDIUM 5.3
  • TI-2026-20653 Payload has an SQL Injection in JSON/RichText Queries on PostgreSQL/SQLite Adapters CVSS 3.1CRITICAL 9.8
  • TI-2026-68608 Payload CMS lets attackers update collection documents CVSS 3.1CRITICAL 9.8
  • TI-2026-68606 Remote code execution in Payload Form Builder plugin CVSS 3.1CRITICAL 10.0
  • TI-2026-68480 SQL injection in Payload SQLite and Postgres adapters CVSS 3.1CRITICAL 9.8
  • TI-2026-68479 Prototype pollution in Payload Import Export plugin CVSS 4.0CRITICAL 9.3
See all 43 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences