{"id":"GHSA-7vg8-29qx-jgj8","summary":"Payload: Client uploads could overwrite S3 objects","details":"### Impact\nAn authenticated user could overwrite an existing S3 object belonging to another upload collection, bypassing that collection’s access controls and prior file validation.\n\nYou are affected if ALL of these are true:\n- Client uploads are enabled for multiple collections that share an S3 bucket.\n- useCompositePrefixes is not configured or is set to `false`.\n\n### Patches\nUsers should upgrade Payload packages to `\u003e= 3.90.0` or `\u003e= 4.0.0-canary.34`.\n\n### Workarounds\nDisable client uploads until you can upgrade.","aliases":["CVE-2026-105867"],"modified":"2026-10-07T20:45:04.347253409Z","published":"2026-10-07T20:28:59Z","database_specific":{"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-10-07T20:28:59Z","nvd_published_at":"2026-10-06T17:17:23Z","cwe_ids":["CWE-639"]},"references":[{"type":"WEB","url":"https://github.com/payloadcms/payload/security/advisories/GHSA-7vg8-29qx-jgj8"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-105867"},{"type":"WEB","url":"https://github.com/payloadcms/payload/commit/2df8238fbf17edfce335c399b90bf524ba9906a2"},{"type":"PACKAGE","url":"https://github.com/payloadcms/payload"},{"type":"WEB","url":"https://github.com/payloadcms/payload/releases/tag/v3.90.0"}],"affected":[{"package":{"name":"@payloadcms/storage-s3","ecosystem":"npm","purl":"pkg:npm/%40payloadcms/storage-s3"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.90.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-7vg8-29qx-jgj8/GHSA-7vg8-29qx-jgj8.json"}},{"package":{"name":"@payloadcms/storage-s3","ecosystem":"npm","purl":"pkg:npm/%40payloadcms/storage-s3"},"ranges":[{"type":"SEMVER","events":[{"introduced":"4.0.0-canary.0"},{"fixed":"4.0.0-canary.34"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-7vg8-29qx-jgj8/GHSA-7vg8-29qx-jgj8.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}