Live › vulnerability › CVE-2023-28434
Go to dashboardMinIO, a self-hosted S3-compatible object store, has a flaw in PostPolicyBucket handling that lets a user write objects into any bucket. An attacker with credentials that already hold broad s3 permissions can escalate privileges and reach data they should not access.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 3h before NVD. All times on this page are UTC.
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| MinIO MinIO | vendor | – | – |
| minio | vendor | < 2023-03-20t20-16-18z | 2023-03-20t20-16-18z |
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
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.
CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
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