CVE-2025-62077: Affiliate Link Tracker Stored XSS Flaw

CVE-2025-62077 Overview

CVE-2025-62077 is a Stored Cross-Site Scripting (XSS) vulnerability affecting the Affiliate Link Tracker WordPress plugin developed by SEOSEON EUROPE S.L. The vulnerability stems from improper neutralization of input during web page generation, allowing attackers to inject malicious scripts that are persistently stored and executed when other users access affected pages.

Critical Impact

Attackers can inject persistent malicious scripts into the WordPress site, potentially compromising administrator sessions, stealing credentials, or performing unauthorized actions on behalf of authenticated users.

Affected Products

• Affiliate Link Tracker WordPress plugin version 0.2 and earlier
• WordPress sites using the vulnerable affiliate-link-tracker plugin

Discovery Timeline

• 2026-01-22 - CVE CVE-2025-62077 published to NVD
• 2026-01-22 - Last updated in NVD database

Technical Details for CVE-2025-62077

Vulnerability Analysis

This Stored XSS vulnerability (CWE-79) occurs when the Affiliate Link Tracker plugin fails to properly sanitize and escape user-supplied input before storing it in the database and subsequently rendering it on web pages. Unlike reflected XSS attacks that require victim interaction with a malicious link, stored XSS payloads persist within the application's data storage, executing automatically whenever the compromised content is viewed by users.

The vulnerability affects the plugin's core functionality for tracking affiliate links, where input fields accept user data that is later displayed without adequate output encoding. This creates a persistent attack vector that can affect multiple users over time.

Root Cause

The root cause is the absence of proper input validation and output encoding mechanisms within the Affiliate Link Tracker plugin. User-controlled data is accepted and stored without sanitization using WordPress's built-in security functions such as sanitize_text_field(), wp_kses(), or esc_html(). When this unsanitized data is rendered in the browser, malicious JavaScript code executes in the context of the victim's session.

Attack Vector

An authenticated attacker with access to the plugin's interface can inject malicious JavaScript payloads into input fields managed by the Affiliate Link Tracker plugin. These payloads are stored in the WordPress database and executed whenever an administrator or other user views the affected content. The attack could be leveraged to:

• Hijack administrator sessions and gain full site control
• Redirect users to malicious external sites
• Deface the website content
• Steal sensitive information including cookies and form data
• Install backdoors or additional malicious plugins

The vulnerability can be exploited by inserting script tags or JavaScript event handlers into plugin fields that lack proper sanitization. For detailed technical information, refer to the Patchstack Vulnerability Report.

Detection Methods for CVE-2025-62077

Indicators of Compromise

• Unexpected JavaScript code present in database entries related to affiliate link configurations
• Suspicious <script> tags or JavaScript event handlers (e.g., onerror, onload, onclick) in plugin data fields
• Unusual outbound network requests from client browsers when accessing plugin-related pages
• Reports from users experiencing unexpected redirects or pop-ups when viewing affiliate link content

Detection Strategies

• Implement web application firewalls (WAF) with XSS detection rules to monitor for script injection patterns
• Deploy Content Security Policy (CSP) headers to restrict script execution sources and report violations
• Conduct regular database audits to identify malicious content stored in plugin-related tables
• Monitor browser console errors and CSP violation reports for XSS attack indicators

Monitoring Recommendations

• Enable WordPress debug logging and review for suspicious plugin activity
• Configure server-side logging to capture unusual POST requests to plugin endpoints
• Implement real-time monitoring of database modifications to plugin configuration tables
• Set up alerts for CSP violation reports that may indicate attempted or successful XSS attacks

How to Mitigate CVE-2025-62077

Immediate Actions Required

• Deactivate and remove the Affiliate Link Tracker plugin immediately if version 0.2 or earlier is installed
• Audit the WordPress database for any malicious scripts that may have been injected through the vulnerable plugin
• Review administrator account activity for signs of unauthorized access or session hijacking
• Invalidate all active user sessions to terminate any potentially compromised sessions
• Scan the WordPress installation for any backdoors or malicious files that may have been installed through XSS exploitation

Patch Information

As of the last NVD update on 2026-01-22, there is no confirmed patched version available for this vulnerability. Site administrators should consider removing the plugin entirely until a secure update is released by SEOSEON EUROPE S.L. Monitor the Patchstack Vulnerability Report for updates on remediation status.

Workarounds

• Remove the Affiliate Link Tracker plugin and use an alternative affiliate tracking solution with better security practices
• Implement a Web Application Firewall (WAF) with XSS filtering rules as a compensating control if plugin removal is not immediately feasible
• Apply strict Content Security Policy headers to mitigate the impact of potential XSS attacks
• Restrict access to WordPress admin areas to trusted IP addresses only
• Ensure all administrative users have strong, unique passwords and enable two-factor authentication

# WordPress Content Security Policy configuration example (add to .htaccess or wp-config.php)
# This helps mitigate XSS impact by restricting script sources

# Add to .htaccess for Apache servers:
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; frame-ancestors 'self';"

# Or add to wp-config.php:
# header("Content-Security-Policy: default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline';");