MinIO: Security Feature Bypass (CVE-2023-28434)
MinIO
MinIO contains a security feature bypass vulnerability that allows an attacker to use crafted requests to bypass metadata bucket name checking and put an object into any bucket while processing `PostPolicyBucket` to conduct privilege escalation. To carry out this attack, the attacker requires credentials with `arn:aws:s3:::*` permission, as well as enabled Console API access. Added to CISA KEV on 2023-09-19.
Why this severity: CVSS 8.8 (NVD), actively exploited (CISA KEV)
- Started
- Sep 19, 2023
- Closed
- Sep 19, 2023
Affected
- See vendor advisory / CISA notes (versions not always listed in KEV feed)
Fixed in
- See vendor advisory linked in sources
Timeline1
CISA added CVE-2023-28434 to the KEV catalog (due 2023-10-10).
Advisories3
Notes & caveats
Derived from CISA KEV JSON feed catalogVersion 2026.10.21. Exact affected/fixed version strings are not always in the KEV record — verify against the vendor advisory URL. startedAt uses dateAdded (exploitation may have begun earlier).
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