{"id":"CVE-2023-28434","published":"2023-03-22T21:15:18Z","modified":"2026-06-17T05:47:43Z","title":"MinIO Security Feature Bypass Vulnerability","vendor":"MinIO","product":"MinIO","tier":"core","eol":null,"description":{"text":"Minio is a Multi-Cloud Object Storage framework. Prior to RELEASE.2023-03-20T20-16-18Z, an attacker can use crafted requests to bypass metadata bucket name checking and put an object into any bucket while processing `PostPolicyBucket`. To carry out this attack, the attacker requires credentials with `arn:aws:s3:::*` permission, as well as enabled Console API access. This issue has been patched in RELEASE.2023-03-20T20-16-18Z. As a workaround, enable browser API access and turn off `MINIO_BROWSER=off`.","provenance":"source","from":"NVD"},"summary":{"text":"MinIO, the multi-cloud object storage framework, contains a security feature bypass in its PostPolicyBucket handling, where metadata bucket name checks can be circumvented via crafted requests. An attacker holding credentials with arn:aws:s3:::* permission and with Console API access enabled can use this flaw to place an object into any bucket, network-reachable and without user interaction.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:10:53Z"},"cvss":{"score":8.8,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.07917,"percentile":0.94716,"date":"2026-10-30","provenance":"source"},"kev":{"dateAdded":"2023-09-19","dueDate":"2023-10-10","ransomware":false,"requiredAction":"Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","notes":"https://github.com/minio/minio/security/advisories/GHSA-2pxw-r47w-4p8c;  https://nvd.nist.gov/vuln/detail/CVE-2023-28434","provenance":"source"},"vulncheckKev":{"dateAdded":"2023-09-04","exploitedFirstSeen":"2023-09-04","ransomware":false,"evidence":[{"url":"https://www.securityjoes.com/post/new-attack-vector-in-the-cloud-attackers-caught-exploiting-object-storage-services","date":"2023-09-04"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2023-09-19"}],"evidenceTotal":2,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"},{"name":"Actively_Exploited_Kev | Oct 22, 2026","url":"https://otx.alienvault.com/pulse/6ad8d33a077cbb5cab524d80","created":"2026-10-21"},{"name":"Actively_Exploited_Kev | Oct 21, 2026","url":"https://otx.alienvault.com/pulse/6ad78130c4d1ac2be83a8b6d","created":"2026-10-20"},{"name":"Actively_Exploited_Kev | Oct 20, 2026","url":"https://otx.alienvault.com/pulse/6ad62f63c24a405a3423cc13","created":"2026-10-19"},{"name":"Actively_Exploited_Kev | Oct 19, 2026","url":"https://otx.alienvault.com/pulse/6ad4dda174e5797d0bd238b7","created":"2026-10-18"},{"name":"Actively_Exploited_Kev | Oct 18, 2026","url":"https://otx.alienvault.com/pulse/6ad38c22e1848f8189d1c121","created":"2026-10-17"}],"provenance":"machine"},"cwes":[{"id":"CWE-269","name":"Improper Privilege Management"}],"references":[{"url":"https://github.com/minio/minio/commit/67f4ba154a27a1b06e48bfabda38355a010dfca5","tags":["Patch"]},{"url":"https://github.com/minio/minio/pull/16849","tags":["Exploit","Issue Tracking"]},{"url":"https://github.com/minio/minio/security/advisories/GHSA-2pxw-r47w-4p8c","tags":["Vendor Advisory"]},{"url":"https://github.com/minio/minio/commit/67f4ba154a27a1b06e48bfabda38355a010dfca5","tags":["Patch"]},{"url":"https://github.com/minio/minio/pull/16849","tags":["Exploit","Issue Tracking"]},{"url":"https://github.com/minio/minio/security/advisories/GHSA-2pxw-r47w-4p8c","tags":["Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-28434","tags":["US Government Resource"]}],"techniques":[{"id":"T1078","name":"Valid Accounts","tactics":["initial-access","persistence","privilege-escalation","stealth"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Requires valid credentials with broad S3 permissions","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"the attacker requires credentials with `arn:aws:s3:::*` permission","start":262,"end":328}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1565","name":"Data Manipulation","tactics":["impact"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Unauthorized object writes into arbitrary buckets","mappingType":"primary_impact","evidence":[{"from":"description","quote":"put an object into any bucket while processing `PostPolicyBucket`","start":169,"end":234}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[{"ecosystem":"Go","package":"github.com/minio/minio","vulnerableRanges":["<0.0.0-202303200415"],"patched":["0.0.0-202303200415"],"from":["GHSA-2pxw-r47w-4p8c"],"provenance":"source"}],"advisories":[{"id":"GHSA-2pxw-r47w-4p8c","url":"https://github.com/advisories/GHSA-2pxw-r47w-4p8c","severity":"HIGH","ecosystem":"Go","package":"github.com/minio/minio","vulnerableRanges":["<0.0.0-202303200415"],"patched":["0.0.0-202303200415"],"provenance":"source","from":"GHSA"}],"euvd":{"id":"EUVD-2023-2395","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2023-2395","exploited":true,"exploitedSince":"2023-09-19","provenance":"source"},"exploits":[],"exploitSources":{"pocGithub":{"count":1,"skipped":0,"earliest":"2023-03-27","earliestUrl":"https://github.com/AbelChe/evil_minio","repos":[{"name":"AbelChe/evil_minio","url":"https://github.com/AbelChe/evil_minio","stars":318,"created":"2023-03-27"}]},"first":{"date":"2023-03-27","source":"PoC-in-GitHub","url":"https://github.com/AbelChe/evil_minio"},"provenance":"source"},"exploitRefs":["https://github.com/minio/minio/pull/16849"],"flow":[{"stage":"exploitation","techniques":["T1078"],"provenance":"ai"},{"stage":"primary","techniques":["T1565"],"provenance":"ai"}],"timeline":[{"date":"2023-03-22","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-28434","provenance":"source"},{"date":"2023-03-27","kind":"exploit-public","label":"First public exploit: PoC-in-GitHub","url":"https://github.com/AbelChe/evil_minio","provenance":"source"},{"date":"2023-09-04","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://www.securityjoes.com/post/new-attack-vector-in-the-cloud-attackers-caught-exploiting-object-storage-services","provenance":"source"},{"date":"2023-09-19","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2023-09-19","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2023-2395","provenance":"source"}],"speed":{"daysToPublicExploit":5,"firstExploitFrom":"PoC-in-GitHub","daysToKev":181},"priority":{"score":68.1,"factors":[{"name":"In a KEV 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unknown"}]},"lineage":{"familyId":"fam-minio-cve-2023-28434","children":[{"from":"CVE-2023-28434","to":"CVE-2024-24747","relation":"related","confidence":"medium","kind":"lineage","evidence":[{"kind":"same-code","provenance":"machine","files":["cmd/auth-handler.go"],"commits":["https://github.com/minio/minio/commit/67f4ba154a27a1b06e48bfabda38355a010dfca5","https://github.com/minio/minio/commit/0ae4915a9391ef4b3ec80f5fcdcf24ee6884e776"],"basis":"rarely changed file"}]}],"packageHistory":[{"cve":"CVE-2023-28434","published":"2023-03-22","fixed":"0.0.0-202303200415","kev":true},{"cve":"CVE-2023-28433","published":"2023-03-22","fixed":"0.0.0-202303200735","kev":false,"link":{"from":"CVE-2023-28434","to":"CVE-2023-28433","relation":"successor","confidence":"medium","kind":"sequence","orderedBy":"description","evidence":[{"kind":"version-step","provenance":"source","package":"Go:github.com/minio/minio","fromFixed":"0.0.0-202303200415","toFixed":"0.0.0-202303200735","daysApart":0},{"kind":"similar","provenance":"machine","score":0.4,"basis":"same product + description similarity"}]}},{"cve":"CVE-2024-24747","published":"2024-01-31","fixed":"0.0.0-20240131185645-0ae4915a9391","kev":false},{"cve":"CVE-2024-36107","published":"2024-05-28","fixed":"0.0.0-20240527191746-e0fe7cc39172","kev":false}],"package":"Go:github.com/minio/minio"}}