CVE-2026-0914: WP DSGVO Tools Plugin XSS Vulnerability

CVE-2026-0914 Overview

The WP DSGVO Tools (GDPR) plugin for WordPress is vulnerable to Stored Cross-Site Scripting (XSS) via the plugin's lw_content_block shortcode in all versions up to, and including, 3.1.36. The vulnerability exists due to insufficient input sanitization and output escaping on user-supplied attributes. This allows authenticated attackers with contributor-level access and above to inject arbitrary web scripts into pages that execute whenever a user accesses an injected page.

Critical Impact

Authenticated attackers can inject persistent malicious scripts that execute in the browsers of site visitors, potentially leading to session hijacking, credential theft, defacement, or malware distribution.

Affected Products

• WP DSGVO Tools (GDPR) plugin for WordPress versions up to and including 3.1.36
• WordPress installations using the vulnerable lw_content_block shortcode functionality
• Sites where contributors or higher-privileged users have been compromised

Discovery Timeline

• 2026-01-23 - CVE CVE-2026-0914 published to NVD
• 2026-01-26 - Last updated in NVD database

Technical Details for CVE-2026-0914

Vulnerability Analysis

This Stored Cross-Site Scripting vulnerability (CWE-79) affects the lw_content_block shortcode implementation in the WP DSGVO Tools plugin. The shortcode handler fails to properly sanitize user-supplied attributes before rendering them in page output, creating an injection point for malicious JavaScript code.

The attack requires contributor-level or higher privileges on the WordPress installation, meaning an attacker must first obtain or compromise an account with at least contributor access. Once authenticated, the attacker can craft a malicious shortcode with embedded JavaScript that persists in the database and executes for all subsequent visitors who view the affected page.

The cross-site scripting vector enables attackers to perform actions in the context of authenticated administrators, potentially leading to full site compromise through privilege escalation, backdoor installation, or sensitive data exfiltration.

Root Cause

The root cause lies in the content-block-shortcode.php file where user-supplied shortcode attributes are processed without adequate sanitization or output escaping. The vulnerable code in version 3.1.35 demonstrates that attribute values are rendered directly into the page HTML without proper encoding, allowing HTML and JavaScript injection.

WordPress provides built-in sanitization and escaping functions such as esc_attr(), esc_html(), and wp_kses() that should be used when handling user-supplied data. The failure to utilize these functions before output creates the XSS vulnerability.

Attack Vector

The attack is conducted over the network and requires low-privileged authentication (contributor access). An attacker would:

1. Authenticate to WordPress with at least contributor-level privileges
2. Create or edit a post/page using the vulnerable lw_content_block shortcode
3. Inject malicious JavaScript through unsanitized shortcode attributes
4. Publish or submit the content for review
5. Wait for victims (including administrators) to view the affected page

The malicious script then executes in the victim's browser context, enabling session theft, keylogging, CSRF attacks, or further exploitation. For technical details on the vulnerability, refer to the Wordfence Vulnerability Report.

Detection Methods for CVE-2026-0914

Indicators of Compromise

• Presence of suspicious JavaScript code within posts or pages using the lw_content_block shortcode
• Unexpected script tags or event handlers in shortcode attribute values in the database
• Unusual network requests to external domains originating from page loads
• Reports of browser warnings or suspicious behavior when viewing specific pages

Detection Strategies

• Review all content using the lw_content_block shortcode for suspicious attributes or embedded scripts
• Implement Web Application Firewall (WAF) rules to detect XSS patterns in shortcode usage
• Enable WordPress audit logging to track shortcode content modifications by contributors
• Use SentinelOne Singularity XDR to monitor for anomalous JavaScript execution patterns

Monitoring Recommendations

• Monitor WordPress database tables for script injection patterns in post content
• Set up alerts for new or modified content containing <script> tags or JavaScript event handlers
• Review contributor and author activity logs for suspicious content creation patterns
• Implement Content Security Policy (CSP) headers to mitigate script injection impact

How to Mitigate CVE-2026-0914

Immediate Actions Required

• Update the WP DSGVO Tools (GDPR) plugin to the latest patched version immediately
• Audit all existing content using the lw_content_block shortcode for malicious payloads
• Review and restrict contributor-level access to trusted users only
• Consider temporarily disabling the plugin if an update is not immediately available

Patch Information

The vulnerability has been addressed in versions after 3.1.36. The plugin changeset contains the security fix implementing proper input sanitization and output escaping for shortcode attributes. Administrators should update via the WordPress admin dashboard or download the latest version from the WordPress plugin repository.

Workarounds

• Restrict user roles with shortcode creation capabilities to trusted administrators only
• Implement a Web Application Firewall with XSS detection rules targeting shortcode parameters
• Add Content Security Policy headers to limit script execution sources
• Temporarily remove or disable the lw_content_block shortcode functionality until patched

# Configuration example
# Add to wp-config.php or functions.php to restrict shortcode usage
# Disable the vulnerable shortcode temporarily
add_action('init', function() {
    remove_shortcode('lw_content_block');
});

# Or implement CSP headers in .htaccess
# Header set Content-Security-Policy "script-src 'self'; object-src 'none';"