DNA View

Critical Severity Vulnerability

This vulnerability has been rated as Critical severity. Immediate action is recommended.

CVE-2026-4003

Critical

Low Medium High Critical

9.8

CVSS Score

Published: Apr 08, 2026

Last Modified: Apr 08, 2026

CWE: CWE-862

Vulnerability Description

The Users manager – PN plugin for WordPress is vulnerable to Privilege Escalation via Arbitrary User Meta Update in all versions up to and including 1.1.15. This is due to a flawed authorization logic check in the userspn_ajax_nopriv_server() function within the 'userspn_form_save' case. The conditional only blocks unauthenticated users when the user_id is empty, but when a non-empty user_id is supplied, execution bypasses this check entirely and proceeds to update arbitrary user meta via update_user_meta() without any authentication or authorization verification. Additionally, the nonce required for this AJAX endpoint ('userspn-nonce') is exposed to all visitors via wp_localize_script on the public wp_enqueue_scripts hook, rendering the nonce check ineffective as a security control. This makes it possible for unauthenticated attackers to update arbitrary user metadata for any user account, including the userspn_secret_token field.

CVSS Metrics

Common Vulnerability Scoring System

Vector String:

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

References & Resources

Severity Details

9.8

out of 10.0

Critical

Weakness Type (CWE)

CWE-862 Top 25 #8

Missing Authorization

Description: The product does not perform an authorization check when an actor attempts to access a resource or perform an action.
Exploit Likelihood: High
Typical Severity: High
OWASP Top 10: A01:2021-Broken Access Control
Abstraction Level: Class