{"id":"CVE-2026-122267","title":"MinIO Signature V4 verification before RELEASE.2026-09-22T19-25-18Z accepts unsigned x-amz-* headers, letting a presigned PUT URL be escalated into a cross-bucket read.","summary":"MinIO Signature V4 verification before RELEASE.2026-09-22T19-25-18Z accepts unsigned x-amz-* headers, letting a presigned PUT URL be escalated into a cross-bucket read.","severity":"high","cvss":8.8,"cvssVector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N","cvssSource":"cna","cwe":["CWE-347"],"vendor":"Chainguard","product":"MinIO","affected":["MinIO <= RELEASE.2026-09-21T00-15-41Z"],"published":"2026-11-05","updated":"2026-11-05","sourceUpdated":"2026-11-05T22:00:11.719Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-122267","references":[{"url":"https://github.com/chainguard-forks/minio/security/advisories/GHSA-48rv-pgqh-mhjg"}],"tags":["cve.org"],"ingestedAt":"2026-11-05T23:41:31.956Z","epss":0.00199,"epssPercentile":0.09739,"slug":"CVE-2026-122267","body":"## Overview\n\nMinIO Signature V4 verification before RELEASE.2026-09-22T19-25-18Z accepts unsigned x-amz-* headers, letting a presigned PUT URL be escalated into a cross-bucket read.\n\n## Affected\n\n- `MinIO <= RELEASE.2026-09-21T00-15-41Z`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}