CVE-2026-25015: UsersWP Plugin CSRF Vulnerability

CVE-2026-25015 Overview

A Cross-Site Request Forgery (CSRF) vulnerability has been identified in the UsersWP WordPress plugin developed by Stiofan. This vulnerability allows attackers to trick authenticated users into performing unintended actions on the affected WordPress installation without their knowledge or consent. CSRF attacks exploit the trust that a web application has in a user's browser, enabling malicious actors to forge requests that appear legitimate.

Critical Impact

Attackers can exploit this CSRF vulnerability to perform unauthorized actions on behalf of authenticated WordPress users, potentially leading to account modifications, privilege changes, or other security-impacting operations within the UsersWP plugin.

Affected Products

• UsersWP WordPress Plugin versions through 1.2.53
• WordPress installations with UsersWP plugin enabled
• Sites using UsersWP for user registration and profile management

Discovery Timeline

• 2026-02-03 - CVE-2026-25015 published to NVD
• 2026-02-03 - Last updated in NVD database

Technical Details for CVE-2026-25015

Vulnerability Analysis

This vulnerability is classified as CWE-352 (Cross-Site Request Forgery). The UsersWP plugin fails to properly validate the origin of requests made to sensitive functionality, allowing attackers to craft malicious web pages or links that execute unauthorized actions when visited by authenticated users.

The attack requires user interaction—specifically, a victim must visit a malicious page or click a crafted link while authenticated to the vulnerable WordPress site. This network-based attack has low complexity to execute but the impact is limited to integrity violations without direct confidentiality or availability compromise.

Root Cause

The root cause of this vulnerability is the absence or improper implementation of anti-CSRF tokens (nonces) in the UsersWP plugin. WordPress provides built-in nonce functionality through wp_create_nonce() and wp_verify_nonce() functions, but the affected plugin versions fail to adequately leverage these security mechanisms for protecting state-changing operations.

When a plugin does not verify that requests originate from the legitimate WordPress admin interface or frontend forms, it becomes susceptible to forged cross-origin requests that the browser will automatically authenticate using existing session cookies.

Attack Vector

The attack vector is network-based and requires user interaction. An attacker would typically:

1. Craft a malicious HTML page containing a form or JavaScript that submits a request to the vulnerable UsersWP endpoint
2. Host this page on a domain controlled by the attacker or inject it into a legitimate site via XSS
3. Lure an authenticated administrator or user to visit the malicious page
4. The victim's browser automatically includes session cookies, causing the forged request to be processed as legitimate

The vulnerability mechanism involves missing nonce verification in plugin form handlers. When state-changing actions are processed without validating a security token tied to the user's session, any cross-origin request with valid session cookies will be accepted. For technical details, see the Patchstack security advisory.

Detection Methods for CVE-2026-25015

Indicators of Compromise

• Unexpected user profile modifications or settings changes without user initiation
• Unusual referrer headers in web server logs pointing to external domains for UsersWP-related requests
• Multiple state-changing requests originating from different IP addresses for the same authenticated session
• User reports of account changes they did not authorize

Detection Strategies

• Monitor web application firewall (WAF) logs for suspicious cross-origin requests to UsersWP endpoints
• Implement Content Security Policy (CSP) headers and monitor violation reports
• Review WordPress audit logs for unexpected administrative or user-level changes
• Deploy runtime application self-protection (RASP) solutions to detect anomalous request patterns

Monitoring Recommendations

• Enable verbose logging for the UsersWP plugin and related WordPress user management functions
• Set up alerts for high-frequency state-changing requests to UsersWP endpoints
• Monitor for unusual patterns in user registration, profile updates, or settings modifications
• Implement SentinelOne Singularity Platform for comprehensive endpoint visibility and threat detection

How to Mitigate CVE-2026-25015

Immediate Actions Required

• Update UsersWP plugin to a version newer than 1.2.53 once a patched version is available
• Implement additional CSRF protection at the web server or WAF level
• Review recent user account changes for any unauthorized modifications
• Consider temporarily disabling the UsersWP plugin if it is not critical to operations until a patch is available

Patch Information

Organizations should monitor the UsersWP plugin repository and the Patchstack advisory for official patch releases. Update to the latest available version as soon as a security fix is published by the vendor.

Workarounds

• Implement SameSite cookie attributes (SameSite=Strict or SameSite=Lax) at the WordPress or server level to prevent cross-origin cookie inclusion
• Deploy a Web Application Firewall (WAF) with CSRF protection rules to filter malicious requests
• Restrict plugin functionality to trusted administrators only until patched
• Educate users about the risks of clicking unknown links while authenticated to WordPress

# Example: Add SameSite cookie attribute via wp-config.php
# Add this to your wp-config.php to enforce SameSite cookies
@ini_set('session.cookie_samesite', 'Strict');

# Alternatively, configure via .htaccess for Apache
# Header always edit Set-Cookie (.*) "$1; SameSite=Strict"