Is this vulnerability remotely exploitable?

Yes. As long as the STS AssumeRoleWithLDAPIdentity endpoint is reachable over the network, an unauthenticated attacker can remotely probe it to enumerate usernames and attempt password guessing.

Does an attacker need valid credentials to start exploiting this?

No. The attacker does not need existing credentials. The weaknesses enable remote username discovery and unrestricted password guessing purely through repeated unauthenticated requests.

What is the safest general fix pattern for this issue?

The most robust fix is to normalize all authentication failure responses to avoid leaking account validity, and to introduce strong rate limiting or lockout controls on the STS authentication endpoint. Combined with short-lived, least-privilege STS tokens, this significantly reduces the impact of guessing attempts.

Severity:

HIGH RISK

(7.5)

Username Enumeration and Missing Rate Limiting (CWE-204, CWE-307) in MinIO AIStor STS LDAP Authentication

CVE-2026-33419

Published:

Mar 24, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

CRITICAL RISK

CRITICAL

(9.8)

OS Command Injection (CWE-78) in Totolink A7100RU CGI Handler setAccessDeviceCfg

Remote Code Execution on the Router

April 12, 2026

CWE-77;CWE-78

CRITICAL RISK

CRITICAL

(9.8)

OS Command Injection (CWE-78) in Totolink A7100RU CGI setLedCfg Handler

Remote Code Execution on the Router

April 12, 2026

Vulnerability Type

Category:

Authentication and Account Enumeration Weakness

CWE:

CWE-204;CWE-307

Impact:

Account Compromise and Unauthorized Data Access

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

Vulnerability Type

Category:

Authentication and Account Enumeration Weakness

CWE:

CWE-204;CWE-307

Impact:

Account Compromise and Unauthorized Data Access

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

Catch This CVE While Code Is Being Written

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Ask AI for summary of CodeAnt

Username Enumeration and Missing Rate Limiting (CWE-204, CWE-307) in MinIO AIStor STS LDAP Authentication

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

CRITICAL RISK

CRITICAL

(9.8)

OS Command Injection (CWE-78) in Totolink A7100RU CGI Handler setAccessDeviceCfg

CRITICAL RISK

CRITICAL

(9.8)

OS Command Injection (CWE-78) in Totolink A7100RU CGI setLedCfg Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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