Cross-tenant bucket access via retained MinIO policy
Published May 8, 2026 · Updated May 8, 2026
Incomplete cleanup in Apache CloudStack allows remote authenticated users to read and write a reused MinIO bucket. The bucket-deletion workflow removes the bucket but fails to delete its MinIO access policy, leaving the former owner's access and secret keys authorized for that name. Exploitation requires a later user to create a bucket with the same name; the former owner can then read and modify its contents.
Summary
What happened
Incomplete cleanup in Apache CloudStack allows remote authenticated users to read and write a reused MinIO bucket. The bucket-deletion workflow removes the bucket but fails to delete its MinIO access policy, leaving the former owner's access and secret keys authorized for that name. Exploitation requires a later user to create a bucket with the same name; the former owner can then read and modify its contents.
The record
- CVE
- CVE-2025-66467
- Published
- May 8, 2026
- Updated
- May 8, 2026
- Vendor
- The Apache Software Foundation
- Product
- Apache CloudStack
- Classifications
- CWE-459, T1530
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- May 8, 2026CVE publishedPublication date reported by the CVE source.
- May 8, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=4.19.0.0 <=4.20.2.0
- Affected versionversion=4.21.0.0 <=4.22.0.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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