CVE-2025-62040: YOP Poll XSS Vulnerability

CVE-2025-62040 Overview

A Cross-Site Scripting (XSS) vulnerability has been identified in the YOP Poll plugin for WordPress. This vulnerability stems from improper neutralization of input during web page generation, allowing attackers to inject malicious scripts into web pages viewed by other users. The vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation).

Critical Impact

Attackers can execute arbitrary JavaScript code in the context of a victim's browser session, potentially leading to session hijacking, credential theft, website defacement, and malware distribution to site visitors.

Affected Products

• YOP Poll WordPress Plugin versions up to and including 6.5.37

Discovery Timeline

• 2025-11-06 - CVE-2025-62040 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-62040

Vulnerability Analysis

This vulnerability exists due to insufficient input sanitization within the YOP Poll plugin. When user-supplied data is processed and rendered in web pages, the plugin fails to properly encode or escape special characters that have significance in HTML and JavaScript contexts. This allows attackers to craft malicious input containing script tags or event handlers that execute when the page is rendered in a victim's browser.

The attack requires user interaction, meaning a victim must visit or interact with a page containing the malicious payload. However, because the vulnerability can affect users across different sessions and potentially affect administrative users, the scope is changed, allowing impact beyond the vulnerable component itself.

Root Cause

The root cause is inadequate input validation and output encoding in the YOP Poll plugin. User-controlled data is incorporated into the HTML output without proper sanitization, allowing HTML and JavaScript injection. WordPress provides numerous escaping functions such as esc_html(), esc_attr(), and wp_kses() that should be applied to all user-supplied data before rendering, but these safeguards appear to be missing or improperly implemented in the affected code paths.

Attack Vector

The vulnerability is exploitable over the network without requiring authentication. An attacker can craft a specially designed poll input or parameter that contains malicious JavaScript code. When this content is subsequently displayed to other users—including site administrators—the malicious script executes in their browser context.

Potential attack scenarios include:

• Injecting scripts through poll creation or voting mechanisms
• Embedding malicious payloads in poll options or metadata
• Leveraging stored XSS to persist malicious content for all visitors

The vulnerability manifests in the poll rendering functionality where user input is displayed. For detailed technical analysis, refer to the Patchstack security advisory.

Detection Methods for CVE-2025-62040

Indicators of Compromise

• Unusual JavaScript code present in poll content or database entries
• Unexpected network requests originating from the WordPress site to external domains
• Reports of pop-ups, redirects, or suspicious behavior when users interact with polls
• Administrative session anomalies or unauthorized configuration changes

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect common XSS patterns in request parameters targeting YOP Poll endpoints
• Monitor server access logs for requests containing encoded script tags or JavaScript event handlers
• Deploy Content Security Policy (CSP) headers and monitor for violation reports indicating script injection attempts
• Scan the WordPress database for malicious JavaScript patterns in poll-related tables

Monitoring Recommendations

• Enable detailed logging for all form submissions and poll interactions
• Configure real-time alerting for CSP violations or suspicious client-side behavior
• Regularly audit poll content and metadata for unexpected HTML or JavaScript
• Monitor browser console errors that may indicate blocked script execution attempts

How to Mitigate CVE-2025-62040

Immediate Actions Required

• Update YOP Poll plugin to the latest version that addresses this vulnerability
• Audit existing poll content for signs of malicious script injection
• Implement a Content Security Policy (CSP) to restrict inline script execution
• Consider temporarily disabling the YOP Poll plugin until patches can be applied

Patch Information

Users should update the YOP Poll plugin beyond version 6.5.37 to remediate this vulnerability. Check the official WordPress plugin repository or the Patchstack advisory for the latest patched version information.

Workarounds

• Implement a strict Content Security Policy that disallows inline scripts and restricts script sources
• Deploy a Web Application Firewall (WAF) with XSS detection rules
• Restrict poll creation and management to trusted administrator accounts only
• Sanitize database content by reviewing and removing any suspicious poll entries

# WordPress configuration: Add CSP header via .htaccess
# Add to WordPress root .htaccess file
<IfModule mod_headers.c>
    Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline';"
</IfModule>