CVE-2025-23568: WP Login Attempt Log XSS Vulnerability

CVE-2025-23568 Overview

CVE-2025-23568 is a Reflected Cross-Site Scripting (XSS) vulnerability affecting the WP Login Attempt Log WordPress plugin developed by fredsted. This vulnerability arises from improper neutralization of user-supplied input during web page generation, allowing attackers to inject malicious scripts that execute in the context of a victim's browser session.

The WP Login Attempt Log plugin is designed to track and log login attempts to WordPress sites, providing administrators with security visibility. However, due to insufficient input validation and output encoding, the plugin fails to properly sanitize user input, creating an attack surface for reflected XSS attacks.

Critical Impact

Attackers can craft malicious URLs that, when clicked by authenticated administrators, execute arbitrary JavaScript in their browser context, potentially leading to session hijacking, credential theft, or unauthorized administrative actions.

Affected Products

• WP Login Attempt Log plugin version 1.3 and earlier
• WordPress installations using the vulnerable wp-login-attempt-log plugin
• All PHP-based WordPress environments running the affected plugin versions

Discovery Timeline

• 2025-02-14 - CVE-2025-23568 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-23568

Vulnerability Analysis

This reflected XSS vulnerability (CWE-79) exists in the WP Login Attempt Log plugin's handling of user input parameters. When the plugin processes request data for displaying login attempt logs, it fails to properly sanitize and encode output, allowing malicious script content to be reflected back to users in the HTTP response.

Reflected XSS vulnerabilities in WordPress plugins are particularly concerning because they typically target administrative users who have elevated privileges. An attacker can craft a specially designed URL containing malicious JavaScript and distribute it via phishing emails, malicious links, or compromised websites.

When an authenticated administrator clicks the malicious link, the injected script executes with their session privileges, potentially allowing the attacker to perform actions such as creating new admin accounts, modifying site settings, or exfiltrating sensitive data.

Root Cause

The root cause of CVE-2025-23568 is the failure to implement proper input validation and output encoding within the plugin. The vulnerable code path directly reflects user-controlled input into the HTML response without sanitizing potentially dangerous characters such as <, >, ", and '. WordPress provides built-in escaping functions like esc_html(), esc_attr(), and wp_kses() that should be used to neutralize potentially malicious input before rendering it to the page.

Attack Vector

The attack vector for this vulnerability involves social engineering combined with technical exploitation. An attacker constructs a URL containing malicious JavaScript payload targeting the vulnerable plugin endpoint. The attack flow typically follows this pattern:

1. Attacker identifies a WordPress site using the vulnerable WP Login Attempt Log plugin
2. Attacker crafts a malicious URL with embedded JavaScript payload
3. Attacker distributes the URL to site administrators via phishing or other means
4. When the administrator clicks the link while authenticated, the malicious script executes
5. The script can perform actions with the administrator's privileges or steal session tokens

The vulnerability requires user interaction (clicking a malicious link), but no authentication is required for the attacker to craft and distribute the exploit URL.

Detection Methods for CVE-2025-23568

Indicators of Compromise

• Unusual administrative actions occurring after users click external links
• Browser console errors or unexpected script execution warnings in the WordPress admin panel
• Web server logs showing requests to the wp-login-attempt-log plugin with suspicious query parameters containing script tags or encoded JavaScript
• Session token exfiltration attempts to external domains in network logs

Detection Strategies

• Monitor web application firewall (WAF) logs for requests containing XSS payloads targeting WordPress plugin endpoints
• Implement Content Security Policy (CSP) headers to detect and block inline script execution attempts
• Review access logs for URLs with encoded characters commonly used in XSS attacks (%3C, %3E, %22, %27)
• Deploy browser-based XSS detection tools that alert on reflected script execution

Monitoring Recommendations

• Enable WordPress security logging to track administrative actions and identify anomalous behavior
• Configure web server access logs to capture full request URIs including query parameters
• Implement real-time alerting for HTTP requests matching known XSS payload patterns
• Monitor for outbound connections from the browser to unexpected domains that could indicate data exfiltration

How to Mitigate CVE-2025-23568

Immediate Actions Required

• Deactivate and remove the WP Login Attempt Log plugin (wp-login-attempt-log) if it is not essential to operations
• Review WordPress user accounts for any unauthorized administrative users that may have been created
• Audit recent administrative actions in WordPress logs to identify potential compromise
• Consider implementing a web application firewall (WAF) with XSS protection rules

Patch Information

As of the last NVD update, the vulnerability affects WP Login Attempt Log versions through 1.3. Site administrators should check the Patchstack Vulnerability Report for the latest remediation guidance and monitor the plugin's official repository for security updates.

If a patched version becomes available, update immediately through the WordPress admin dashboard or via WP-CLI.

Workarounds

• Disable the vulnerable plugin until a security patch is released
• Implement Content Security Policy headers to prevent inline script execution: Content-Security-Policy: script-src 'self'
• Use a WordPress security plugin that provides XSS filtering capabilities
• Restrict administrative access to trusted IP addresses to reduce the attack surface

# Add CSP header via .htaccess (Apache)
<IfModule mod_headers.c>
    Header set Content-Security-Policy "script-src 'self'; object-src 'none';"
</IfModule>

# Or via wp-config.php
# Add to theme's functions.php or security plugin
# add_action('send_headers', function() {
#     header("Content-Security-Policy: script-src 'self'; object-src 'none';");
# });