How broadly exploitable is this vulnerability?

Any user with a Patreon account who can log in through the affected OAuth provider can potentially be mapped onto the same local identity as other Patreon-authenticated users, making exploitation possible wherever the integration is deployed.

What level of access does an attacker need?

The attacker only needs access to a valid Patreon account and the ability to use the Patreon OAuth login within the target application; no prior account on the application or elevated privileges are inherently required.

What is the safest general fix pattern?

Implement a unique, deterministic mapping from each Patreon account to a distinct internal user identifier, typically by incorporating provider-specific user IDs and ensuring that token.User.ID (or its equivalent) cannot be shared across unrelated users.

Severity:

CRITICAL RISK

(9.1)

Improper Authentication Mapping (CWE-287) in Patreon OAuth Provider

CVE-2026-42560

Published:

May 9, 2026

Status:

Received

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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Vulnerability Type

Category:

Improper Authentication

CWE:

CWE-287

Impact:

Account Impersonation and Cross-Account Data Exposure

Severity:

CRITICAL RISK

(9.1)

CVSS Version:

3.1

Vulnerability Type

Category:

Improper Authentication

CWE:

CWE-287

Impact:

Account Impersonation and Cross-Account Data Exposure

Severity:

CRITICAL RISK

(9.1)

CVSS Version:

3.1

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Improper Authentication Mapping (CWE-287) in Patreon OAuth Provider

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

(8.8)

PHP Code Injection via File Upload (CWE-94) in Aero CMS Admin Post Creation

HIGH RISK

HIGH

(8.8)

Code Injection (CWE-94) via Module Parameters in Evolution CMS

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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