{"id":"CVE-2023-28433","aliases":["GHSA-w23q-4hw3-2pp6"],"title":"Minio vulnerable to Privilege Escalation on Windows via Path separator manipulation","summary":"Minio vulnerable to Privilege Escalation on Windows via Path separator manipulation","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","vendor":"minio","product":"github.com/minio/minio","ecosystem":"go","affected":["github.com/minio/minio < 0.0.0-202303200735"],"patched":["github.com/minio/minio 0.0.0-202303200735"],"published":"2023-09-06","updated":"2026-10-08","sourceUpdated":"2026-10-08T08:11:02.392575410Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-w23q-4hw3-2pp6","references":[{"url":"https://github.com/minio/minio/security/advisories/GHSA-w23q-4hw3-2pp6"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-28433"},{"url":"https://github.com/minio/minio/commit/8d6558b23649f613414c8527b58973fbdfa4d1b8"},{"url":"https://github.com/minio/minio/commit/b3c54ec81e0a06392abfb3a1ffcdc80c6fbf6ebc"},{"url":"https://github.com/minio/minio"},{"url":"https://github.com/minio/minio/releases/tag/RELEASE.2023-03-20T20-16-18Z"}],"tags":["osv","go"],"epss":0.00981,"epssPercentile":0.62079,"ingestedAt":"2026-10-09T07:36:09.699Z","slug":"CVE-2023-28433","body":"## Overview\n\n### Impact\nAll users on Windows are impacted. MinIO fails to filter the `\\` character, which allows for arbitrary object placement across\nbuckets. As a result, a user with low privileges, such as an access key, service account, or STS credential, which only has permission to `PutObject` in a specific bucket, can create an admin user.\n\n### Patches\nThere are two patches that fix this problem comprehensively\n\n```\ncommit b3c54ec81e0a06392abfb3a1ffcdc80c6fbf6ebc\nAuthor: Harshavardhana <harsha@minio.io>\nDate:   Mon Mar 20 13:16:00 2023 -0700\n\n    reject object names with '\\' on windows (#16856)\n```\n\n```\ncommit 8d6558b23649f613414c8527b58973fbdfa4d1b8\nAuthor: Harshavardhana <harsha@minio.io>\nDate:   Mon Mar 20 00:35:25 2023 -0700\n\n    fix: convert '\\' to '/' on windows (#16852)\n```\n\n### Workarounds\nThere are no known workarounds\n\n### References\nThe vulnerable code:\n```go\n// minio/cmd/generic-handlers.go\n// Check if the incoming path has bad path components,\n// such as \"..\" and \".\"\n// SlashSeparator -> /\n// dotdotComponent -> ..\n// dotComponent -> .\nfunc hasBadPathComponent(path string) bool {\n  path = strings.TrimSpace(path)\n  for _, p := range strings.Split(path, SlashSeparator) {\n    switch strings.TrimSpace(p) {\n    case dotdotComponent:\n      return true\n    case dotComponent:\n      return true\n    }\n  }\n  return false\n}\n```\n\n\n## Affected packages\n\n- `github.com/minio/minio < 0.0.0-202303200735`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `github.com/minio/minio 0.0.0-202303200735`","depth":"twilight","depthScore":49,"depthScoreParts":{"impact":48.4,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}