CVE-2025-43837: Total Donations Plugin XSS Vulnerability

CVE-2025-43837 Overview

CVE-2025-43837 is a Reflected Cross-Site Scripting (XSS) vulnerability affecting the Total Donations WordPress plugin developed by binti76. The vulnerability stems from improper neutralization of input during web page generation, allowing attackers to inject malicious scripts that execute in the context of a victim's browser session when they interact with a specially crafted URL.

Reflected XSS vulnerabilities in WordPress plugins are particularly dangerous due to the widespread use of WordPress as a content management system. Attackers can exploit this flaw to steal session cookies, hijack user accounts, deface websites, or distribute malware to site visitors.

Critical Impact

Attackers can execute arbitrary JavaScript in authenticated user browsers, potentially stealing administrator credentials, hijacking sessions, or performing unauthorized actions on behalf of victims.

Affected Products

• Total Donations WordPress plugin versions up to and including 3.0.8
• WordPress installations using the vulnerable Total Donations plugin
• All sites with the Total Donations plugin (total-donations) active

Discovery Timeline

• 2025-05-19 - CVE-2025-43837 published to NVD
• 2026-04-01 - Last updated in NVD database

Technical Details for CVE-2025-43837

Vulnerability Analysis

This vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as Cross-Site Scripting. The Total Donations plugin fails to properly sanitize user-supplied input before reflecting it back in HTTP responses, creating an attack surface for script injection.

Reflected XSS attacks require user interaction, typically through clicking a malicious link. When a victim accesses a crafted URL containing the payload, the vulnerable plugin processes the malicious input and includes it in the generated page without adequate encoding or sanitization. The victim's browser then executes the injected script with the same privileges as legitimate scripts from the affected website.

The attack can be executed without authentication against the vulnerable plugin, making it accessible to any external attacker who can convince a user to click a malicious link.

Root Cause

The root cause of this vulnerability lies in the Total Donations plugin's failure to implement proper input validation and output encoding. When user-controlled data is reflected in HTTP responses, the plugin does not adequately sanitize special characters that have meaning in HTML/JavaScript contexts. Characters such as <, >, ", and ' should be encoded as HTML entities before being included in page output.

WordPress provides built-in functions like esc_html(), esc_attr(), and wp_kses() specifically designed to prevent XSS attacks. The vulnerable code path in Total Donations does not utilize these sanitization functions appropriately, allowing malicious payloads to pass through unfiltered.

Attack Vector

The attack vector for this Reflected XSS vulnerability follows a typical exploitation pattern:

1. The attacker identifies a vulnerable parameter in the Total Donations plugin that reflects user input
2. A malicious URL is crafted containing JavaScript payload in the vulnerable parameter
3. The attacker distributes the malicious link through phishing emails, social media, or compromised websites
4. When a victim clicks the link, their browser sends a request to the vulnerable WordPress site
5. The Total Donations plugin reflects the malicious payload in the response without sanitization
6. The victim's browser executes the attacker's JavaScript in the context of the WordPress site

Successful exploitation can lead to session hijacking, credential theft, website defacement, or redirection to malicious sites. Administrators accessing malicious links are at particularly high risk as their elevated privileges can be leveraged for complete site compromise.

Detection Methods for CVE-2025-43837

Indicators of Compromise

• Suspicious URL parameters containing encoded JavaScript characters (%3Cscript%3E, %22%3E, etc.) in web server access logs
• Unexpected outbound connections to unknown domains from client browsers after visiting plugin pages
• User reports of unexpected JavaScript alerts, redirects, or credential prompts when accessing donation pages
• Unusual query strings targeting Total Donations plugin endpoints

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block common XSS payload patterns in requests
• Enable Content Security Policy (CSP) headers to restrict inline script execution and report violations
• Review web server access logs for requests containing suspicious encoded characters or script tags
• Implement browser-based XSS auditors and security extensions for administrator workstations

Monitoring Recommendations

• Configure real-time alerting for HTTP requests matching known XSS payload signatures
• Monitor for anomalous traffic patterns to Total Donations plugin endpoints
• Track CSP violation reports for indicators of injection attempts
• Review authentication logs for suspicious login patterns following donation page access

How to Mitigate CVE-2025-43837

Immediate Actions Required

• Update the Total Donations plugin immediately if a patched version is available from the developer
• Temporarily deactivate the Total Donations plugin if no patch is available until a fix is released
• Review web server logs for evidence of exploitation attempts targeting the plugin
• Implement WAF rules to block requests containing XSS payloads to donation endpoints

Patch Information

For detailed vulnerability information and remediation guidance, refer to the Patchstack XSS Vulnerability Advisory. Website administrators should check for plugin updates through the WordPress dashboard and apply any available security patches.

If the plugin is no longer maintained or no patch is available, consider migrating to an alternative donations plugin that is actively maintained and follows WordPress security best practices.

Workarounds

• Implement Content Security Policy headers with script-src 'self' to prevent inline script execution
• Deploy a Web Application Firewall with XSS detection rules enabled to filter malicious requests
• Restrict access to the WordPress admin area using IP allowlisting to reduce attack surface
• Educate administrators to verify URLs before clicking and avoid accessing the site from untrusted links

# WordPress .htaccess CSP configuration example
<IfModule mod_headers.c>
    Header set Content-Security-Policy "script-src 'self'; object-src 'none'; frame-ancestors 'self';"
    Header set X-XSS-Protection "1; mode=block"
    Header set X-Content-Type-Options "nosniff"
</IfModule>