Vulnerabilities
Vulnerable Software

Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 11.6%
CVSS Severity
CVSS v3 Score 6.5
Products affected by CVE-2026-105867


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