Vulnerability · Published Oct 6, 2026 · Assigned by GitHub_M
CVE-2026-105867Payload: Client uploads could overwrite S3 objects
High 7.1
In plain English
A high-severity authorization bypass via user-controlled key in payload from payloadcms. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @payloadcms/storage-s3 | 3.90.0 | GHSA-7vg8-29qx-jgj8 |
| npm | @payloadcms/storage-s3 | 4.0.0-canary.34 | GHSA-7vg8-29qx-jgj8 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| payloadcms | payload | < 3.90.0>= 4.0.0-canary.0, < 4.0.0-canary.34 |
| @payloadcms | storage-s3 | < 3.90.0>= 4.0.0-canary.0, < 4.0.0-canary.34 |
Weakness: CWE-639 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N