CVE-2025-64198: Easy Social Share Buttons XSS Vulnerability

CVE-2025-64198 Overview

A Reflected Cross-Site Scripting (XSS) vulnerability has been identified in the Easy Social Share Buttons WordPress plugin developed by appscreo. This vulnerability (CWE-79) allows attackers to inject malicious scripts into web pages viewed by other users through improper neutralization of user-supplied input during web page generation.

Critical Impact

Attackers can execute arbitrary JavaScript in victims' browsers, potentially stealing session cookies, credentials, or performing unauthorized actions on behalf of authenticated users.

Affected Products

• Easy Social Share Buttons (easy-social-share-buttons3) versions prior to 10.7.1
• WordPress sites running vulnerable versions of the plugin
• Any website using the affected Easy Social Share Buttons plugin component

Discovery Timeline

• 2025-11-06 - CVE-2025-64198 published to NVD
• 2026-01-20 - Last updated in NVD database

Technical Details for CVE-2025-64198

Vulnerability Analysis

This Reflected XSS vulnerability exists due to improper input sanitization in the Easy Social Share Buttons WordPress plugin. The vulnerability allows an attacker to craft malicious URLs containing JavaScript code that, when clicked by a victim, executes within the context of the affected WordPress site. The attack requires user interaction—specifically, the victim must click on a specially crafted link or visit a malicious page that redirects to the vulnerable endpoint.

The vulnerability impacts confidentiality, integrity, and availability at limited levels. An attacker can potentially access sensitive information displayed on the page, modify page content, or cause disruption to the user's browsing session. Because the scope is changed, the malicious script can affect resources beyond the vulnerable component's security scope.

Root Cause

The root cause of this vulnerability is insufficient input validation and output encoding in the Easy Social Share Buttons plugin. User-controllable data is reflected back in HTTP responses without proper sanitization, allowing malicious scripts to be injected and executed in the browser context. This violates the principle of treating all user input as untrusted and failing to properly encode output based on the rendering context.

Attack Vector

The attack is conducted over the network and requires a victim to interact with a malicious link. An attacker would typically craft a URL containing JavaScript payload and distribute it through phishing emails, social media, or other channels. When a victim clicks the link while authenticated to the WordPress site, the malicious script executes with the victim's session privileges.

The exploitation flow involves:

1. Attacker identifies a vulnerable parameter in the Easy Social Share Buttons plugin
2. Attacker crafts a malicious URL embedding JavaScript code in the vulnerable parameter
3. Victim receives and clicks the malicious link
4. The victim's browser executes the injected script within the context of the WordPress site
5. Attacker can steal session tokens, perform actions as the victim, or redirect to phishing pages

Detection Methods for CVE-2025-64198

Indicators of Compromise

• Unusual URL parameters containing JavaScript code patterns such as <script>, javascript:, or event handlers like onerror=
• Web server logs showing requests with encoded script tags (%3Cscript%3E) in URL parameters
• User reports of unexpected browser behavior or pop-ups when visiting the site
• Browser console errors indicating blocked inline script execution from CSP violations

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block common XSS payload patterns in URL parameters
• Implement Content Security Policy (CSP) headers to restrict inline script execution and report violations
• Monitor web server access logs for suspicious URL patterns containing script injection attempts
• Use browser-based XSS auditing tools and security scanners to identify potential injection points

Monitoring Recommendations

• Enable verbose logging for the Easy Social Share Buttons plugin and review for anomalous requests
• Configure real-time alerting for WAF XSS detection events
• Implement CSP violation reporting to capture attempted script injection attacks
• Regularly audit plugin configurations and access patterns for signs of exploitation

How to Mitigate CVE-2025-64198

Immediate Actions Required

• Update Easy Social Share Buttons plugin to version 10.7.1 or later immediately
• Review web server logs for evidence of exploitation attempts prior to patching
• Implement Content Security Policy headers to provide defense-in-depth against XSS attacks
• Consider temporarily disabling the plugin if immediate patching is not possible

Patch Information

The vulnerability has been addressed in Easy Social Share Buttons version 10.7.1. Website administrators should update to this version or later through the WordPress plugin update mechanism. For detailed vulnerability information and patch details, refer to the Patchstack WordPress Vulnerability Report.

Workarounds

• Deploy a Web Application Firewall with XSS protection rules to filter malicious requests before they reach the plugin
• Implement strict Content Security Policy headers including script-src 'self' to block inline script execution
• Temporarily disable the Easy Social Share Buttons plugin until patching is completed
• Restrict access to WordPress admin areas to trusted IP addresses to limit attack surface

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

# For Nginx, add to server block
# add_header Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; frame-ancestors 'self';";