CVE-2023-28433 — Minio is a Multi-Cloud Object Storage framework

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

01What is this vulnerability?

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…

02Affected products

Vendor	Product	Versions
minio	minio	< RELEASE.2023-03-20T20-16-18Z

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-03-22T20:33:43.452Z
• Last modified: 2025-02-25T14:51:18.769Z

09References

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