How exploitable is this vulnerability in practice?

It is significantly exploitable if an attacker can obtain a user's password through phishing, credential stuffing, or reuse from another breach. With only the password, the attacker can bypass TOTP and obtain valid OIDC tokens, leading to unauthorized access to relying-party applications.

Does an attacker need access to the victim's TOTP device or secret?

No. The vulnerability specifically allows bypassing the TOTP second factor. An attacker only needs the victim's username and password to exploit the issue, provided the OIDC authorization endpoint is reachable.

What is the safest general fix pattern?

The safest pattern is to treat MFA as an atomic requirement: a session should be marked "fully authenticated" only after all required factors have been successfully completed, and only that fully authenticated state must be accepted by the OIDC authorization endpoint and any token issuance logic.

Severity:

HIGH RISK

(8.5)

Authentication Bypass via Incomplete MFA Enforcement (CWE-287) in Tinyauth OIDC Authorization Endpoint

CVE-2026-32246

Published:

Mar 12, 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

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Privilege Escalation via Bypassed Access Control

May 6, 2026

Vulnerability Type

Category:

Authentication Bypass

CWE:

CWE-287

Impact:

Bypass of Multi-Factor Authentication and Unauthorized Account Access

Severity:

HIGH RISK

(8.5)

CVSS Version:

3.1

Vulnerability Type

Category:

Authentication Bypass

CWE:

CWE-287

Impact:

Bypass of Multi-Factor Authentication and Unauthorized Account Access

Severity:

HIGH RISK

(8.5)

CVSS Version:

3.1

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Authentication Bypass via Incomplete MFA Enforcement (CWE-287) in Tinyauth OIDC Authorization Endpoint

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

HIGH RISK

HIGH

(8.6)

Server-Side Request Forgery (CWE-918) in OpenClaw Zalo Plugin sendPhoto

HIGH RISK

HIGH

(8.8)

Authorization Bypass (CWE-863) in OpenClaw Matrix Room Control Commands

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Ship clean & secure code faster

Ship clean & secure code faster

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