CVE-2023-28434: MinIO Security Feature Bypass Vulnerability

Reference page built from the source records below, each shown as its source publishes it. Dataset version ref-83d5d42ac741, updated 2026-11-02T23:39:54.475Z.

CISA Known Exploited Vulnerabilities

Name: MinIO Security Feature Bypass Vulnerability
Vendor: MinIO
Product: MinIO
Added to the catalog: 2023-09-19
Due date for US federal agencies: 2023-10-10
Weaknesses: CWE-269
Catalog version: 2026.10.30

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.

Required action (CISA)

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Ransomware use: CISA does not mark known use of this vulnerability in ransomware campaigns.

Links in CISA's notes

Read on 2026-11-02T23:39:54.475Z under licence cisa-kev-cc0@b0067899 from https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

NVD analysis

Status: Analyzed
Published: 2023-03-22T21:15:18.427
Last modified: 2026-06-17T05:47:43.610
Weaknesses: CWE-269, NVD-CWE-noinfo

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`.

Metric	Score	Severity	Vector	Scored by
CVSS 3.1	8.8	HIGH	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	[email protected] (Secondary)
CVSS 3.1	8.8	HIGH	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	[email protected] (Primary)

References

https://github.com/minio/minio/commit/67f4ba154a27a1b06e48bfabda38355a010dfca5 (Patch)
https://github.com/minio/minio/pull/16849 (Exploit, Issue Tracking)
https://github.com/minio/minio/security/advisories/GHSA-2pxw-r47w-4p8c (Vendor Advisory)
https://github.com/minio/minio/commit/67f4ba154a27a1b06e48bfabda38355a010dfca5 (Patch)
https://github.com/minio/minio/pull/16849 (Exploit, Issue Tracking)
https://github.com/minio/minio/security/advisories/GHSA-2pxw-r47w-4p8c (Vendor Advisory)
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-28434 (US Government Resource)

This product uses the NVD API but is not endorsed or certified by the NVD.

Read on 2026-11-02T23:42:08.214Z under licence nvd-api-terms-of-use@ff2a5288 from https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2023-28434

CVE record

Title (CNA): MinIO is vulnerable to privilege escalation on Linux/MacOS
Assigner: GitHub_M
State: PUBLISHED
Published: 2023-03-22T20:44:04.216Z
Updated: 2025-10-21T23:15:22.302Z
Problem types: CWE-269: Improper Privilege Management

References

Read on 2026-11-03T02:03:15.356Z under licence cve-terms-of-use@81bfa2f3 from https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2023/28xxx/CVE-2023-28434.json

GitHub Advisory Database

GHSA-2pxw-r47w-4p8c: Privilege Escalation on Linux/MacOS

Severity (GitHub): high
CVSS: 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:H
Weaknesses: CWE-269
Published: 2023-09-05T15:45:10Z
Updated: 2025-10-22T19:20:03Z

go github.com/minio/minio: affected < 0.0.0-202303200415, first patched 0.0.0-202303200415

### Impact
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.

### Patches
```
commit 67f4ba154a27a1b06e48bfabda38355a010dfca5
Author: Aditya Manthramurthy <[email protected]>
Date: Sun Mar 19 21:15:20 2023 -0700

fix: post policy request security bypass (#16849)
```

### Workarounds
Browser API access must be enabled turning off `MINIO_BROWSER=off` allows for this workaround.

### References
The vulnerable code:
```go
// minio/cmd/generic-handlers.go
func setRequestValidityHandler(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// ...
// For all other requests reject access to reserved buckets
bucketName, _ := request2BucketObjectName(r)
if isMinioReservedBucket(bucketName) || isMinioMetaBucket(bucketName) {
if !guessIsRPCReq(r) && !guessIsBrowserReq(r) && !guessIsHealthCheckReq(r) && !guessIsMetricsReq(r) && !isAdminReq(r) && !isKMSReq(r) {
if ok {
tc.FuncName = "handler.ValidRequest"
tc.ResponseRecorder.LogErrBody = true
}
writeErrorResponse(r.Context(), w, errorCodes.ToAPIErr(ErrAllAccessDisabled), r.URL)
return
}
}
// ...
```

Read on 2026-11-03T08:52:29.387Z under licence ghsa-cc-by-4.0@9e5f1b3c from https://api.github.com/advisories/GHSA-2pxw-r47w-4p8c

Also known as / affected packages

GHSA-2pxw-r47w-4p8c

Also known as: CVE-2023-28434. OSV.dev record, GitHub advisory.

Go github.com/minio/minio: introduced 0, fixed 0.0.0-202303200415

Read on 2026-11-03T01:51:52.447Z under licence ghsa-cc-by-4.0@9e5f1b3c from https://api.osv.dev/v1/vulns/GHSA-2pxw-r47w-4p8c

Defensive techniques (MITRE D3FEND)

D3FEND maps these defensive techniques to the weakness (CWE) that NVD lists for this CVE, through the digital artifacts the weakness affects. D3FEND does not say they stop this vulnerability.

CWE-269: Improper Privilege Management

D3FEND lists no defensive technique for this weakness.

D3FEND ontology version 1.6.0.

Read on 2026-11-02T23:55:30.320Z under licence d3fend-terms-of-use@f98cbc7e from https://d3fend.mitre.org/api/weakness/cwe/CWE-269.json

MITRE D3FEND™ knowledge graph. © 2025 The MITRE Corporation.
"The MITRE Corporation (MITRE) hereby grants you a non-exclusive, royalty-free license to use D3FEND for research, development, and commercial purposes. Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." Terms: https://d3fend.mitre.org/tou/

Sources and licences

CISA
Source: CISA Catalog of Known Exploited Vulnerabilities, version 2026.10.30, CC0 1.0. Use of this data does not imply endorsement by CISA or DHS.
CC0 1.0 Universal
National Vulnerability Database (NIST)
This product uses the NVD API but is not endorsed or certified by the NVD.
NVD API Terms of Use (NIST publications in the public domain, 17 U.S.C. 105)
CVE Program, The MITRE Corporation
Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation. CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.
CVE Program Terms of Use ("CVE Usage" licence)
GitHub Advisory Database
Source: GitHub Advisory Database, https://github.com/advisories/GHSA-2pxw-r47w-4p8c, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Changes: fields selected and reformatted by ransomware-tracker.com.
CC BY 4.0
GitHub Advisory Database via OSV.dev
GHSA-2pxw-r47w-4p8c: GitHub Advisory Database, https://github.com/advisories/GHSA-2pxw-r47w-4p8c. Licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/), provided as is, without warranties. Retrieved via OSV.dev (https://osv.dev/vulnerability/GHSA-2pxw-r47w-4p8c), which enriches records; fields selected and reformatted by ransomware-tracker.com.
CC BY 4.0
MITRE D3FEND
MITRE D3FEND™ knowledge graph. © 2025 The MITRE Corporation.
"The MITRE Corporation (MITRE) hereby grants you a non-exclusive, royalty-free license to use D3FEND for research, development, and commercial purposes. Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." Terms: https://d3fend.mitre.org/tou/
MITRE D3FEND Terms of Use (site + knowledge graph); source repo MIT

Cite this page

Dragons Eye Ransomware Tracker, "CVE-2023-28434: MinIO Security Feature Bypass Vulnerability",
entity page, dataset version ref-83d5d42ac741, updated 2026-11-02T23:39:54.475Z,
https://ransomware-tracker.com/cve/CVE-2023-28434 (accessed 2026-11-03).
Underlying source: CISA Catalog of Known Exploited Vulnerabilities, version 2026.10.30.
Underlying source: National Vulnerability Database (NIST), CVE API 2.0, record last modified 2026-06-17T05:47:43.610.
Underlying source: CVE List (CVE Program, The MITRE Corporation), record updated 2025-10-21T23:15:22.302Z.
Underlying source: GitHub Advisory Database, GHSA-2pxw-r47w-4p8c, updated 2025-10-22T19:20:03Z.
Underlying source: GitHub Advisory Database, GHSA-2pxw-r47w-4p8c, via OSV.dev, modified 2026-10-08T08:11:01.963531191Z.
Underlying source: MITRE D3FEND, ontology version 1.6.0.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.

CISA KEV index