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

What is CVE-2026-105867?

CVE-2026-105867 is a high-severity missing authorization vulnerability in @payloadcms payload, published on 6 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

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.

Weakness: CWE-639

Which versions are affected by CVE-2026-105867?

4 open source packages ship an affected version, including @payloadcms/storage-s3. It affects 1 product.

Products include Payloadcms Payload.

How do I fix CVE-2026-105867?

Upgrade @payloadcms/storage-s3 to a fixed version for your release line: 3.90.0 or 4.0.0-canary.34.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2026-105867 being exploited?

There is no known exploitation of CVE-2026-105867 in the wild and no public exploit code.

Other vulnerabilities in @payloadcms payload

• CVE-2026-105857 Payload: RCE in Payload Form Builder Critical 10.0
• CVE-2026-105859 Payload: Unauthorized update to collection documents Critical 9.8
• CVE-2026-25544 Payload has an SQL Injection in JSON/RichText Queries on PostgreSQL/SQLite Adapters Critical 9.8
• CVE-2022-27952 Unrestricted Upload of File with Dangerous Type in Payload Critical 9.8
• CVE-2026-105851 Payload: Field access control bypass on auth collections Critical 9.3

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-7vg8-29qx-jgj8.