What’s Vulnerable › Vulnerabilities

CVE-2023-28433: Minio Privilege Escalation on Windows via Path separator manipulation

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-03-22 · updated 2026-06-17
• Weakness: CWE-668

Description

Minio is a Multi-Cloud Object Storage framework. All users on Windows prior to version RELEASE.2023-03-20T20-16-18Z are impacted. MinIO fails to filter the `\` character, which allows for arbitrary object placement across buckets. As a result, a user with low privileges, such as an access key, service account, or STS credential, which only has permission to `PutObject` in a specific bucket, can create an admin user. This issue is patched in RELEASE.2023-03-20T20-16-18Z. There are no known workarounds.

Affected products

• minio: before 2023-03-20t20-16-18z — fixed in 2023-03-20t20-16-18z

How to fix

Upgrade to a fixed version: minio 2023-03-20t20-16-18z. Check the vendor advisory for mitigations.

References

• https://github.com/minio/minio/commit/8d6558b23649f613414c8527b58973fbdfa4d1b8
• https://github.com/minio/minio/commit/b3c54ec81e0a06392abfb3a1ffcdc80c6fbf6ebc
• https://github.com/minio/minio/releases/tag/RELEASE.2023-03-20T20-16-18Z
• https://github.com/minio/minio/security/advisories/GHSA-w23q-4hw3-2pp6
• https://github.com/minio/minio/commit/8d6558b23649f613414c8527b58973fbdfa4d1b8
• https://github.com/minio/minio/commit/b3c54ec81e0a06392abfb3a1ffcdc80c6fbf6ebc
• https://github.com/minio/minio/releases/tag/RELEASE.2023-03-20T20-16-18Z
• https://github.com/minio/minio/security/advisories/GHSA-w23q-4hw3-2pp6

Get alerted when CVE-2023-28433 or the next vulnerability affects your stack