How severe is CVE-2023-28434?

CVE-2023-28434 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-28434 being actively exploited?

Yes. CVE-2023-28434 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2023-09-19, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2023-28434?

CVE-2023-28434 affects Minio. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-28434?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2023-28434 have an EU (EUVD) identifier?

Yes. CVE-2023-28434 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-2395. It is also flagged as exploited in the EUVD (since 2023-09-19).

When was CVE-2023-28434 published?

CVE-2023-28434 was published on 2023-03-22 and last updated on 2026-06-17.

CVE-2023-28434

CVE-2023-28434 is a high-severity vulnerability in Minio with a CVSS 3.x base score of 8.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2023-09-19). The underlying weakness is classified as CWE-269.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 7% (93rd percentile)
Actively exploited: Yes — listed in CISA KEV (added 2023-09-19)
EU (EUVD) id: EUVD-2023-2395
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2023-09-19)
Weakness: CWE-269
Affected product: Minio
Published: 2023-03-22
Last modified: 2026-06-17

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`.

Frequently asked questions

What is CVE-2023-28434?: 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`.
How severe is CVE-2023-28434?: CVE-2023-28434 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-28434 being actively exploited?: Yes. CVE-2023-28434 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2023-09-19, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2023-28434?: CVE-2023-28434 affects Minio. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-28434?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2023-28434 have an EU (EUVD) identifier?: Yes. CVE-2023-28434 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-2395. It is also flagged as exploited in the EUVD (since 2023-09-19).
When was CVE-2023-28434 published?: CVE-2023-28434 was published on 2023-03-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:minio:minio:*:*:*:*:*:*:*:*

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