How severe is CVE-2023-28434?

CVE-2023-28434 has a CVSS score of 8.8/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2023-28434?

CVE-2023-28434 affects the following packages: github.com/minio/minio (Go). Ecosystems affected: Go.

How do I fix CVE-2023-28434?

Update github.com/minio/minio to version 0.0.0-202303200415 or later. Run your dependency manager's update command and verify no transitive dependencies pin the vulnerable version. Use O3 Security's SCA scanner to confirm the fix is applied across your entire dependency tree.

Is CVE-2023-28434 actively exploited in the wild?

Yes. There are 4 known exploit references for CVE-2023-28434, including 3 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2023-28434?

CVE-2023-28434 has an EPSS (Exploit Prediction Scoring System) score of 52.1%, placing it in the 98th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2023-28434 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2023-28434 (MinIO Security Feature Bypass Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2023-09-19. CISA required all US federal civilian agencies to remediate this vulnerability by 2023-10-10. The required action was: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

When was CVE-2023-28434 published, and has it been updated?

CVE-2023-28434 was published on March 22, 2023 and was last updated on April 10, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2023-09-19 — agencies required to remediate by 2023-10-10

🐹 Go

CVE-2023-28434

HIGH

MinIO is vulnerable to privilege escalation on Linux/MacOS

Also known asBIT-minio-2023-28434GHSA-2pxw-r47w-4p8c

Published

Mar 22, 2023

Updated

Apr 10, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

4 known

EPSS Exploitation Probability

via FIRST.org ↗

52.1%probability of exploitation in next 30 days

High Risk98th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Blast Radius

1 pkg affected

🐹github.com/minio/minio

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

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.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐹Go	`github.com/minio/minio`	all versions	0.0.0-202303200415

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Minio is a Multi-Cloud Object Storage framework. Prior to RELEASE.2023-0…

github.comGithubMar 2023

Minio is a Multi-Cloud Object Storage framework. Prior to RELEASE.2023-0…

github.comNVDMar 2023

Minio is a Multi-Cloud Object Storage framework. Prior to RELEASE.2023-0…

cisa.govCISASep 2023

Frequently Asked Questions

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`.

O3 Security · Impact-Aware SCA

Is CVE-2023-28434 in your stack?

O3 detects CVE-2023-28434 across Go dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my stack How O3 SCA works