CVE-2026-105867: Payload: Client uploads could overwrite S3 objects

October 7, 2026

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.

References

github.com/advisories/GHSA-7vg8-29qx-jgj8
github.com/payloadcms/payload/commit/2df8238fbf17edfce335c399b90bf524ba9906a2
github.com/payloadcms/payload/releases/tag/v3.90.0
github.com/payloadcms/payload/security/advisories/GHSA-7vg8-29qx-jgj8
nvd.nist.gov/vuln/detail/CVE-2026-105867

Code Behaviors & Features

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