Vulnerability record

CVE-2023-28434

MinIO Security Feature Bypass Vulnerability

HighExploitation confirmedCISA KEV

What should I do?

This vulnerability is in the CISA Known Exploited Vulnerabilities catalog: attackers are using it. If you run MinIO, fix it now.

CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

US federal civilian agencies must remediate by Oct 10, 2023.

Patch status

Official fix available since Sep 30, 2026

Apply the vendor's update to every affected system. Check the fixed-in versions below where known.

Basis: NVD patch reference

Patch or advisory on github.com (opens in a new tab)

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`.

Source: NIST National Vulnerability Database. Official vulnerability data, reproduced as published.

Affected products

Products affected by this vulnerability, with versions and the source of each entry
Product	Vendor	Affected versions	Fixed in	Source
MinIO	MinIO	< 2023-03-20t20-16-18z	2023-03-20t20-16-18z	KEV

Sources: KEV = CISA Known Exploited Vulnerabilities catalog.

Intelligence timeline

Developments from the last 30 days, newest first.

CVSS scoredUpdateKEVSep 30, 2026
CVE-2023-28434 scored CVSS 8.8: MinIO MinIO, MinIO Security Feature Bypass Vulnerability
CISA lists this as exploited in the wild. Unpatched MinIO systems are exposed to active attacks now.
Basis: NIST National Vulnerability Database
Patch releasedUpdateKEVSep 30, 2026
Patch released for CVE-2023-28434: MinIO MinIO, MinIO Security Feature Bypass Vulnerability
An official fix is now available for MinIO MinIO. This vulnerability is being exploited, so apply it promptly.
Basis: NVD patch reference

1 earlier event is available with a subscription. See plans.

Coverage

We have not published a story about this vulnerability yet.

References

github.com https://github.com/minio/minio/security/advisories/GHSA-2pxw-r47w-4p8c
nvd.nist.gov https://nvd.nist.gov/vuln/detail/CVE-2023-28434
github.com https://github.com/minio/minio/commit/67f4ba154a27a1b06e48bfabda38355a010dfca5
github.com https://github.com/minio/minio/pull/16849
cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-28434