Vulnerability Intelligence Report
MinIO: LDAP login brute-force via user enumeration and missing rate limit
CVE-2026-33419
MinIO is a high-performance object storage system. Prior to RELEASE.2026-03-17T21-25-16Z, MinIO AIStor's STS (Security Token Service) AssumeRoleWithLDAPIdentity endpoint is vulnerable to LDAP credential brute-forcing due to two combined weaknesses: (1) distinguishable error responses that enable username enumeration, and (2) absence of rate limiting on authentication attempts. An unauthenticated network attacker can enumerate valid LDAP usernames and then perform unlimited password guessing to obtain temporary AWS-style STS credentials, gaining access to the victim's S3 buckets and objects. This issue has been patched in RELEASE.2026-03-17T21-25-16Z.
No Active Exploit Signals
CVSS Base Score
9.1
CRITICAL
EPSS Probability:0.39%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
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Weaponization
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SSVC Action
—
Weaknesses (CWE)
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| minio | minio | < RELEASE.2026-03-17T21-25-16Z (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
0.394%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | GitHub, Inc. · Vendor · USA |
| Reserved | 2026-03-19T18:45:22 |
| Published | 2026-03-24T19:05:30 |
| Last Updated | 2026-03-25T13:24:44 |
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