{"id":"CVE-2026-105867","title":"Payload is a free and open source headless content management system","summary":"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 ano…","severity":"high","cvss":7.1,"cvssVector":"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","cwe":["CWE-639"],"vendor":"payloadcms","product":"payload","affected":["payload < 3.90.0","payload >= 4.0.0-canary.0, < 4.0.0-canary.34","storage-s3 < 3.90.0","storage-s3 >= 4.0.0-canary.0, < 4.0.0-canary.34"],"published":"2026-10-06","updated":"2026-10-06","sourceUpdated":"2026-10-06T18:16:50.187","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-105867","references":[{"url":"https://github.com/payloadcms/payload/commit/2df8238fbf17edfce335c399b90bf524ba9906a2","label":"security-advisories@github.com"},{"url":"https://github.com/payloadcms/payload/releases/tag/v3.90.0","label":"security-advisories@github.com"},{"url":"https://github.com/payloadcms/payload/security/advisories/GHSA-7vg8-29qx-jgj8","label":"security-advisories@github.com"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-06T17:24:30.442506Z"},"cvssSource":"cna","ingestedAt":"2026-10-06T17:09:22.189Z","slug":"CVE-2026-105867","body":"## Overview\n\nPayload 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}