{"id":"CVE-2026-105867","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-105867","generatedAt":"2026-10-28T01:02:16.095Z","title":"This bypasses the target collection's access controls and prior file validation.","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.","published":"2026-10-06T17:17:23.000Z","lastModified":"2026-10-15T00:07:52.000Z","status":"Analyzed","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"4.0","score":7.1,"severity":"HIGH","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-639"],"affected":["payloadcms/payload"],"epss":{"score":0.0022,"percentile":0.12447,"date":"2026-10-26","history":[{"date":"2026-10-07","score":0.00253,"percentile":0.15343}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.22%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-06T17:17:23.000Z","detail":{"score":"7.1","severity":"HIGH","publishedAt":"2026-10-06T17:17:23.137Z"},"summary":"New CVE, high severity (CVSS 7.1)."}],"references":[{"url":"https://github.com/payloadcms/payload/commit/2df8238fbf17edfce335c399b90bf524ba9906a2","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/payloadcms/payload/releases/tag/v3.90.0","tags":["Patch","Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/payloadcms/payload/security/advisories/GHSA-7vg8-29qx-jgj8","tags":["Vendor Advisory"],"source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-105867","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}