CVE-2026-93363 json
Payload CMS storage-vercel-blob Adapter Improper Access Control on Upload Route
published 2026-09-25 44 d ago modified 2026-11-04 4 d ago also GHSA-mc8m-rr6c-r5qr , EUVD-2026-87206
- cvss
- 4.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 7%
- public exploits
- 0
- none known
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.
Patch / fix
- npm @payloadcms/storage-vercel-blob 3.90.0, 4.0.0-canary.34
- payloadcms payload 3.90.0, 4.0.0-canary.34
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 44 d ago
Exploit prediction
0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 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 |
| CNA | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
| CNA | 4.0 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| GitHub | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | @payloadcms/storage-vercel-blob | >=3.25.0, <3.90.0 >=4.0.0-canary.0, <4.0.0-canary.34 |
3.90.0 4.0.0-canary.34 |
Affected products
- payloadcms payload
Classification
- Weakness
-
- CWE-862 Missing Authorization
References
-
github.com
/payloadcms/payload/commit/47abe9bb5c444330dbfaa9a5bc2033337932270b
web
-
github.com
/payloadcms/payload/security/advisories/GHSA-mc8m-rr6c-r5qr
vendor-advisory, web
-
vulncheck.com
/advisories/payload-cms-storage-vercel-blob-adapter-improper-access-control-on-upload-route
third-party-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2026-93363
advisory
-
github.com
/payloadcms/payload
package
-
github.com
/payloadcms/payload/releases/tag/v3.90.0
web
Sources
- CVE List CVE-2026-93363
- GitHub Advisory GHSA-mc8m-rr6c-r5qr
- NVD CVE-2026-93363
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