How broadly exploitable is this vulnerability?

The vulnerability is broadly exploitable wherever the affected Note Mark version is deployed and the login endpoint is reachable. Any attacker who knows or can guess valid usernames for OIDC-registered users can obtain their sessions by submitting the password `"null"`.

Does an attacker need an existing account or any form of access?

No prior account or access is required. The bypass is fully unauthenticated; the attacker only needs a valid username or identifier for a target OIDC-based account and network access to the login endpoint.

What is the safest general fix pattern?

The safest pattern is to treat accounts with no password as password-ineligible: remove any fallback hash logic, ensure that password comparison only occurs when a real per-user hash exists, and restrict OIDC-linked accounts to federated login only unless a secure, explicit password setup process is completed.

Severity:

CRITICAL RISK

(9.4)

Authentication Bypass via Hard-Coded Password Fallback (CWE-287) in Note Mark

CVE-2026-41571

Published:

May 4, 2026

Status:

Deferred

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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HIGH RISK

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Privilege Escalation via Bypassed Access Control

May 6, 2026

Vulnerability Type

Category:

Authentication Bypass

CWE:

CWE-287

Impact:

Account Takeover / Unauthorized Access

Severity:

CRITICAL RISK

(9.4)

CVSS Version:

3.1

Vulnerability Type

Category:

Authentication Bypass

CWE:

CWE-287

Impact:

Account Takeover / Unauthorized Access

Severity:

CRITICAL RISK

(9.4)

CVSS Version:

3.1

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Authentication Bypass via Hard-Coded Password Fallback (CWE-287) in Note Mark

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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