CVE-2023-28434

CRITICALNVD 8.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2023-09-19), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 8.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, nvd
Trending — 3 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 8%CVSS: 8.8Exploit: cisa kev · ssvc active · public exploitExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
8.8
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
8%
EPSS %ILE
95%
KEV
⚠ Exploited

Published

March 22, 2023

Last Modified

February 26, 2026

Advisory Details (4)

Auto-updated Jun 2, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: github_pr, github, cisa, github_commit.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-28434
github Patch Available

Privilege Escalation on Linux/MacOS · Advisory · minio/minio · GitHub

https://github.com/minio/minio/security/advisories/GHSA-2pxw-r47w-4p8c
github_pr

fix: post policy request security bypass

Fix merged in minio/minio PR #16849 on 2023-03-20 — awaiting tagged release

https://github.com/minio/minio/pull/16849
github_commit

commit 67f4ba154a27 (minio/minio)

Fix landed in minio/minio commit 67f4ba154a27 — awaiting tagged release

https://github.com/minio/minio/commit/67f4ba154a27a1b06e48bfabda38355a010dfca5

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/minio/minio—0.0.0-202303200415—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 16× in last 7d / 70× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 216 total refreshes for this CVE.

  1. 2026-08-30 03:43 UTCEG score recompute
  2. 2026-08-30 01:19 UTCEPSS rescore
  3. 2026-08-28 22:07 UTCEG score recompute
  4. 2026-08-28 21:38 UTCEPSS rescore
  5. 2026-08-27 17:22 UTCCISA KEV update
  6. 2026-08-27 16:36 UTCEG score recompute
  7. 2026-08-27 14:23 UTCEPSS rescore
  8. 2026-08-26 17:41 UTCCISA KEV update
  9. 2026-08-26 15:20 UTCEG score recompute
  10. 2026-08-26 14:43 UTCEPSS rescore
  11. 2026-08-25 14:05 UTCEG score recompute
  12. 2026-08-25 13:46 UTCEPSS rescore
  13. 2026-08-24 18:52 UTCCISA KEV update
  14. 2026-08-24 17:02 UTCEG score recompute
  15. 2026-08-24 14:14 UTCEPSS rescore
  16. 2026-08-24 12:49 UTCEG score recompute
  17. 2026-08-23 03:10 UTCEG score recompute
  18. 2026-08-23 00:17 UTCEPSS rescore
  19. 2026-08-22 01:57 UTCEG score recompute
  20. 2026-08-21 23:46 UTCEPSS rescore
  21. 2026-08-21 16:49 UTCCISA KEV update
  22. 2026-08-21 00:43 UTCEG score recompute
  23. 2026-08-20 22:53 UTCEPSS rescore
  24. 2026-08-20 17:06 UTCCISA KEV update
  25. 2026-08-19 19:19 UTCEG score recompute
Show 75 more
  1. 2026-08-19 17:33 UTCCISA KEV update
  2. 2026-08-19 17:02 UTCEPSS rescore
  3. 2026-08-18 17:59 UTCEG score recompute
  4. 2026-08-18 16:58 UTCCISA KEV update
  5. 2026-08-18 13:46 UTCEPSS rescore
  6. 2026-08-17 13:56 UTCCISA KEV update
  7. 2026-08-16 15:28 UTCEG score recompute
  8. 2026-08-16 14:53 UTCEPSS rescore
  9. 2026-08-16 02:52 UTCEG score recompute
  10. 2026-08-16 02:12 UTCEPSS rescore
  11. 2026-08-15 01:39 UTCEG score recompute
  12. 2026-08-15 01:28 UTCEPSS rescore
  13. 2026-08-14 00:27 UTCEG score recompute
  14. 2026-08-13 21:58 UTCEPSS rescore
  15. 2026-08-12 14:49 UTCEG score recompute
  16. 2026-08-12 13:48 UTCEPSS rescore
  17. 2026-08-11 19:32 UTCCISA KEV update
  18. 2026-08-11 17:46 UTCEG score recompute
  19. 2026-08-11 13:39 UTCEPSS rescore
  20. 2026-08-11 00:58 UTCEG score recompute
  21. 2026-08-08 18:17 UTCEG score recompute
  22. 2026-08-08 16:34 UTCEPSS rescore
  23. 2026-08-07 17:09 UTCCISA KEV update
  24. 2026-08-07 17:05 UTCEG score recompute
  25. 2026-08-07 16:24 UTCEPSS rescore
  26. 2026-08-06 15:51 UTCEG score recompute
  27. 2026-08-06 13:44 UTCEPSS rescore
  28. 2026-08-05 23:00 UTCEG score recompute
  29. 2026-08-05 19:15 UTCEPSS rescore
  30. 2026-08-05 19:15 UTCEPSS rescore
  31. 2026-08-05 17:25 UTCCISA KEV update
  32. 2026-08-04 17:34 UTCEG score recompute
  33. 2026-08-04 17:02 UTCCISA KEV update
  34. 2026-08-04 15:07 UTCEPSS rescore
  35. 2026-08-04 13:22 UTCEG score recompute
  36. 2026-08-04 10:35 UTCEPSS rescore
  37. 2026-08-03 19:22 UTCCISA KEV update
  38. 2026-08-03 12:08 UTCEG score recompute
  39. 2026-08-03 10:34 UTCEPSS rescore
  40. 2026-08-02 02:30 UTCEG score recompute
  41. 2026-08-02 02:25 UTCEPSS rescore
  42. 2026-08-02 02:24 UTCEPSS rescore
  43. 2026-08-01 05:30 UTCEG score recompute
  44. 2026-08-01 04:13 UTCEPSS rescore
  45. 2026-08-01 04:13 UTCEPSS rescore
  46. 2026-07-30 19:44 UTCEG score recompute
  47. 2026-07-30 16:26 UTCEPSS rescore
  48. 2026-07-30 16:26 UTCEPSS rescore
  49. 2026-07-30 11:18 UTCEG score recompute
  50. 2026-07-30 02:51 UTCEG score recompute
  51. 2026-07-30 01:28 UTCEPSS rescore
  52. 2026-07-30 01:28 UTCEPSS rescore
  53. 2026-07-29 19:27 UTCCISA KEV update
  54. 2026-07-28 17:06 UTCEG score recompute
  55. 2026-07-28 15:34 UTCEPSS rescore
  56. 2026-07-28 15:34 UTCEPSS rescore
  57. 2026-07-27 19:24 UTCCISA KEV update
  58. 2026-07-27 17:17 UTCCISA KEV update
  59. 2026-07-27 15:52 UTCEG score recompute
  60. 2026-07-27 14:10 UTCEPSS rescore
  61. 2026-07-26 18:46 UTCEG score recompute
  62. 2026-07-26 14:52 UTCEPSS rescore
  63. 2026-07-26 14:52 UTCEPSS rescore
  64. 2026-07-26 14:34 UTCEG score recompute
  65. 2026-07-26 01:57 UTCEG score recompute
  66. 2026-07-25 14:16 UTCEPSS rescore
  67. 2026-07-24 14:15 UTCEPSS rescore
  68. 2026-07-23 14:16 UTCEPSS rescore
  69. 2026-07-23 14:16 UTCEPSS rescore
  70. 2026-07-23 02:20 UTCEG score recompute
  71. 2026-07-22 22:05 UTCEG score recompute
  72. 2026-07-22 19:40 UTCCISA KEV update
  73. 2026-07-22 17:52 UTCEG score recompute
  74. 2026-07-22 14:06 UTCEPSS rescore
  75. 2026-07-22 14:06 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCAbelChe/evil_minio
    First seen Mar 27, 2023

    EXP for CVE-2023-28434 MinIO unauthorized to RCE

    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2023-28434?
CVE-2023-28434 is a critical vulnerability published on March 22, 2023. 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…
When was CVE-2023-28434 disclosed?
CVE-2023-28434 was first published in the National Vulnerability Database on March 22, 2023, with the most recent update on February 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-28434 actively exploited?
Yes. CISA added CVE-2023-28434 to the Known Exploited Vulnerabilities catalog on September 19, 2023, affecting MinIO MinIO. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2023-28434?
CVE-2023-28434 has a CVSS v3 base score of 8.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2023-28434?
CVE-2023-28434 affects MinIO MinIO. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2023-28434?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-28434, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2023-28434

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