CVE-2023-28434
Actively exploited. CVE-2023-28434 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-09-19) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
Public exploit code is available. Proof-of-concept or working exploit code for CVE-2023-28434 is indexed in GitHub PoC. Expect opportunistic scanning and exploitation attempts — prioritize remediation.
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.
CSIRTS triage
- What
- A security feature bypass vulnerability allows unauthorized object uploads to any bucket.
- Who is affected
- Users with credentials that have `arn:aws:s3:::*` permission and Console API access are affected.
- Urgency
- Remediation is critical due to active exploitation of this vulnerability.
- Action
- Users should update to the latest version of MinIO to mitigate this issue.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 93% of all EPSS-scored CVEs.
Exploit availability
Public exploit or proof-of-concept code for CVE-2023-28434 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.
- GitHub PoCPublic proof-of-concept repositories on GitHub reference this CVE.look it up ↗
Advisory coverage (1)
- criticalexploitedCVE-2023-28434: MinIO Security Feature Bypass Vulnerabilitycisa-kev · 2023-09-19
External references
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[](https://www.csirts.com/cve/CVE-2023-28434)