CVE-2025-24635: Paytm Payment Donation XSS Vulnerability

CVE-2025-24635 Overview

CVE-2025-24635 is a Reflected Cross-Site Scripting (XSS) vulnerability discovered in the Paytm Payment Donation WordPress plugin (paytm-donation) developed by integrationdevpaytm. This 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.

Critical Impact

This XSS vulnerability enables attackers to execute arbitrary JavaScript in users' browsers, potentially leading to session hijacking, credential theft, and unauthorized actions on behalf of authenticated users visiting a maliciously crafted URL.

Affected Products

• Paytm Payment Donation WordPress Plugin version 2.3.1 and earlier
• WordPress installations using the paytm-donation plugin

Discovery Timeline

• 2025-01-31 - CVE-2025-24635 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-24635

Vulnerability Analysis

This vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as Cross-Site Scripting. The Paytm Payment Donation plugin fails to properly sanitize user-supplied input before reflecting it back in HTTP responses, creating a Reflected XSS attack vector.

Reflected XSS vulnerabilities occur when an application takes user-controlled data and includes it in the immediate response without proper encoding or validation. In this case, the plugin processes donation-related parameters that are reflected back to users without adequate sanitization, allowing attackers to craft malicious URLs that execute arbitrary JavaScript code when clicked by victims.

Root Cause

The root cause of CVE-2025-24635 lies in insufficient input validation and output encoding within the Paytm Payment Donation plugin. The plugin does not adequately sanitize user-supplied input before incorporating it into dynamically generated web pages. This oversight allows specially crafted input containing JavaScript code to be reflected in the HTTP response and executed by the victim's browser.

WordPress plugins that handle payment-related functionality are particularly sensitive targets, as successful exploitation could allow attackers to manipulate donation forms, steal payment information, or redirect users to phishing pages.

Attack Vector

The attack requires user interaction in the form of clicking a malicious link. An attacker crafts a URL containing JavaScript payload within vulnerable parameters of the Paytm Payment Donation plugin. When a victim clicks this link, the malicious script executes in the context of the victim's browser session with the same privileges as the legitimate page.

The vulnerability is exploitable via maliciously crafted URLs that include JavaScript code in plugin parameters. When a user visits such a URL, the plugin reflects the unsanitized input back in the response, causing the browser to execute the injected script. This can lead to session token theft, defacement, phishing attacks, or redirection to malicious sites.

For technical details on the vulnerability mechanism, refer to the Patchstack security advisory.

Detection Methods for CVE-2025-24635

Indicators of Compromise

• Unusual URL patterns in web server logs containing encoded JavaScript payloads targeting the paytm-donation plugin
• Suspicious GET or POST requests to donation-related endpoints with script tags or event handlers
• User reports of unexpected browser behavior or redirects when interacting with donation pages
• Evidence of session hijacking or unauthorized account access following interaction with donation forms

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block common XSS payloads in URL parameters
• Monitor web server access logs for requests containing encoded script content targeting the paytm-donation plugin paths
• Deploy browser-based XSS detection using Content Security Policy (CSP) violation reporting
• Utilize endpoint detection solutions to identify suspicious JavaScript execution patterns

Monitoring Recommendations

• Enable detailed logging for all WordPress plugin endpoints, particularly those handling user input
• Configure alerting for CSP violation reports that may indicate XSS exploitation attempts
• Review and baseline normal traffic patterns to the donation functionality for anomaly detection
• Implement real-time monitoring for DOM modifications that could indicate XSS activity

How to Mitigate CVE-2025-24635

Immediate Actions Required

• Update the Paytm Payment Donation plugin to a patched version if available from the vendor
• Disable or remove the paytm-donation plugin if it is not essential to site operations
• Implement Content Security Policy (CSP) headers to mitigate the impact of potential XSS exploitation
• Review access logs for evidence of exploitation attempts
• Notify users who may have been exposed to malicious URLs targeting this vulnerability

Patch Information

Check the official WordPress plugin repository and the vendor's website for updated versions of the Paytm Payment Donation plugin that address this vulnerability. The vulnerability affects versions through 2.3.1, so users should upgrade to any version newer than 2.3.1 once a patched release becomes available. Additional details can be found in the Patchstack vulnerability database entry.

Workarounds

• Implement a Web Application Firewall (WAF) with XSS filtering rules to block malicious requests
• Add strict Content Security Policy headers to prevent inline script execution
• Restrict access to the donation functionality to authenticated users only
• Consider temporarily disabling the plugin until a patch is available

# Example Apache .htaccess CSP configuration
<IfModule mod_headers.c>
    Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline';"
    Header set X-XSS-Protection "1; mode=block"
    Header set X-Content-Type-Options "nosniff"
</IfModule>