Auth bypass in @Payloadcms Storage-S3
CVE-2026-105867
Payload is a free and open source headless content management system. In @payloadcms/storage-s3 versions before 3.90.0 and canary versions before 4.0.0-canary.34, an authenticated user can overwrite an existing S3 object belonging to another upload collection when client uploads are enabled for multiple collections sharing a bucket and useCompositePrefixes is false or unset. This bypasses the target collection's access controls and prior file validation. This issue is fixed in versions 3.90.0 and 4.0.0-canary.34.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
EPSS exploit prediction
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Affected products
- @Payloadcms Storage-S3 — versions < 3.90.0, >= 4.0.0-canary.0, < 4.0.0-canary.34
- Payloadcms Payload — versions < 3.90.0, >= 4.0.0-canary.0, < 4.0.0-canary.34