# CVE-2023-28434: Privilege Escalation on Linux/MacOS

Source: https://junglewise.ai/threats/cve-2023-28434-minio-security-feature-bypass-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2023-09-05. Updated: 2026-05-09  
License: CC BY 4.0 with a link back

CVE-2023-28434 · Severity: critical · CVSS 3.1 · Exploited in the wild · Published 2023-09-05

MinIO contains a security feature bypass vulnerability where crafted requests can bypass metadata bucket name checking during PostPolicyBucket processing. This allows an authenticated attacker with specific S3 permissions and Console API access to upload objects to any bucket, leading to privilege escalation.

Technologies: [github.com/minio/minio (Go)](https://junglewise.ai/threats/technologies/github-com-minio-minio), [Minio](https://junglewise.ai/threats/technologies/minio). Vendors: [Go](https://junglewise.ai/threats/vendors/go), [MinIO](https://junglewise.ai/threats/vendors/minio).

## Quick answers

**Is CVE-2023-28434 exploited in the wild?** Yes. CVE-2023-28434 is known to be exploited in the wild, first recorded on 19 September 2023. Treat it as urgent.

**How severe is CVE-2023-28434?** Critical severity, with a CVSS score of 3.1, published 5 September 2023.

**Which products and versions are affected?** github.com/minio/minio (Go) SEMVER:introduced=0,fixed=0.0.0-202303200415.

**Is there a fix for CVE-2023-28434?** Yes. github.com/minio/minio (Go): upgrade to 0.0.0-202303200415 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2023-28434 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2023-28434?** Check whether you run github.com/minio/minio (Go) or Minio at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/minio/minio (Go): upgrade to 0.0.0-202303200415 or later

  ```sh
  go get github.com/minio/minio@v0.0.0-202303200415
  ```


## Affected products

- MinIO MinIO Prior to RELEASE.2023-03-20T20-16-18Z

## Identifiers

- CVE-2023-28434
- GHSA-2pxw-r47w-4p8c

## Timeline

- 2023-03-20: patched: Fixed in RELEASE.2023-03-20T20-16-18Z
- 2023-09-19: disclosed
- 2023-09-19: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
- 2023-09-19: exploited: Reported as exploited in the wild per CISA KEV and advisory.

## Related threats

- [MinIO Signature V4 verification improper signature validation](https://junglewise.ai/threats/cve-2026-122267-minio-signature-v4-verification-before-release-2026-09-22t19-25)
- [MinIO Embedded Console hard-coded cryptographic key authentication bypass](https://junglewise.ai/threats/cve-2026-113466-a-security-vulnerability-has-been-detected-in-minio-up-to)
- [MinIO signature verification bypass in SigV4 header validation](https://junglewise.ai/threats/cve-2026-97731-minio-through-7aac2a2-does-not-verify-that-every-x-amz-header)
- [MinIO path traversal in ReadMultiple storage-REST endpoint](https://junglewise.ai/threats/cve-2026-42600-minio-path-traversal-in-readmultiple-storage-rest-endpoint)
- [MinIO has an Unauthenticated Object Write via Query-String Credential Signature Bypass in Unsigned-Trailer Uploads](https://junglewise.ai/threats/cve-2026-41145-minio-has-an-unauthenticated-object-write-via-query-string)