Disclosure summary
### Impact An authenticated user could overwrite an existing S3 object belonging to another upload collection, bypassing that collection’s access controls and prior file validation. You are affected if ALL of these are true: - Client uploads are enabled for multiple collections that share an S3 bucket. - useCompositePrefixes is not configured or is set to `false`. ### Patches Users should upgrade Payload packages to `>= 3.90.0` or `>= 4.0.0-canary.34`. ### Workarounds Disable client uploads until you can upgrade.
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
GitHub Reviewed Security Advisories · GHSA-7vg8-29qx-jgj8
Open original source · Updated Oct 07, 2026
Payload: Client uploads could overwrite S3 objects
Source severity: HIGH / 7.1
| Ecosystem | Package | Affected range | First patched |
|---|---|---|---|
| npm | @payloadcms/storage-s3 | < 3.90.0 | 3.90.0 |
| npm | @payloadcms/storage-s3 | >= 4.0.0-canary.0, < 4.0.0-canary.34 | 4.0.0-canary.34 |
Original records & references
- NIST NVD record
- CVE Program record
- github.com — Reviewed advisory
PUBLISHED 2026-10-07T16:28:59-04:00
MODIFIED 2026-10-07T16:29:00-04:00
INGESTED 2026-10-08T12:30:39-04:00