CVE-2025-11995: WordPress Community Events XSS Vulnerability

CVE-2025-11995 Overview

The Community Events plugin for WordPress contains a Stored Cross-Site Scripting (XSS) vulnerability in the event details parameter. This security flaw exists in all versions up to and including 1.5.2 due to insufficient input sanitization and output escaping. The vulnerability allows unauthenticated attackers to inject arbitrary web scripts into pages that execute whenever a user accesses the affected page.

Critical Impact

Unauthenticated attackers can inject persistent malicious scripts that execute in the context of any user viewing the compromised event pages, potentially leading to session hijacking, credential theft, or malware distribution.

Affected Products

• Community Events plugin for WordPress versions up to and including 1.5.2
• WordPress sites using vulnerable Community Events plugin versions

Discovery Timeline

• 2025-11-01 - CVE-2025-11995 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-11995

Vulnerability Analysis

This Stored Cross-Site Scripting vulnerability (CWE-79) enables unauthenticated attackers to exploit the Community Events plugin's event details parameter. The vulnerability stems from the plugin's failure to properly sanitize user-supplied input and escape output when rendering event information. When an attacker submits malicious JavaScript code through the event details field, the unsanitized payload is stored in the database and subsequently rendered without proper encoding whenever users view the affected event page.

The network-based attack vector requires no authentication or user interaction, and the scope is changed—meaning the vulnerable component impacts resources beyond its security scope. This allows attackers to target any user who visits the compromised event page, including administrators with elevated privileges.

Root Cause

The root cause lies in the insufficient input sanitization and output escaping mechanisms within the community-events.php file. When processing event details submitted through user forms, the plugin fails to validate and sanitize input data before storing it in the database. Additionally, when retrieving and displaying this data, proper output encoding is not applied, allowing stored JavaScript to execute in the browser context.

Attack Vector

The attack is conducted over the network without requiring authentication. An attacker can exploit this vulnerability by submitting a crafted payload containing malicious JavaScript through the event details form field. Since no user interaction is required for the initial injection and the attack affects users beyond the vulnerable component's scope, this represents a significant security risk for WordPress installations using the affected plugin.

The malicious script persists in the database and executes each time a user accesses the injected page, enabling attacks such as session cookie theft, keylogging, phishing overlays, or redirects to malicious websites.

Detection Methods for CVE-2025-11995

Indicators of Compromise

• Unexpected JavaScript code present in event detail fields within the WordPress database
• Unusual <script> tags or event handlers (e.g., onerror, onload) in stored event content
• Web server logs showing suspicious POST requests to event creation endpoints with encoded script payloads
• User reports of unexpected behavior, pop-ups, or redirects when viewing event pages

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block common XSS payloads targeting event detail parameters
• Deploy Content Security Policy (CSP) headers to mitigate script execution from unauthorized sources
• Conduct regular database audits for stored XSS patterns in event-related tables
• Enable detailed logging for form submissions and monitor for script injection attempts

Monitoring Recommendations

• Monitor web server access logs for suspicious patterns targeting the Community Events plugin endpoints
• Set up alerting for Content Security Policy violation reports
• Implement integrity monitoring for plugin files to detect unauthorized modifications
• Review user-generated content periodically for signs of malicious script injection

How to Mitigate CVE-2025-11995

Immediate Actions Required

• Update the Community Events plugin to the latest patched version immediately
• Review existing event entries in the database for potentially injected malicious scripts
• Implement a Web Application Firewall with XSS protection rules as a defense-in-depth measure
• Consider temporarily disabling the plugin until the update can be applied if immediate patching is not possible

Patch Information

The vulnerability has been addressed in a newer version of the Community Events plugin. The WordPress Changeset Update contains the security fix. Administrators should update to the latest available version through the WordPress plugin repository. For additional details, refer to the Wordfence Vulnerability Report.

Workarounds

• Deploy a Web Application Firewall (WAF) with rules to filter XSS payloads targeting event detail parameters
• Implement Content Security Policy headers to restrict script execution to trusted sources only
• Restrict access to event creation functionality to authenticated and trusted users until the plugin is updated
• Manually sanitize existing event entries by removing any suspicious script content from the database

# Example: Review event details in WordPress database for suspicious content
wp db query "SELECT * FROM wp_posts WHERE post_type='community_event' AND post_content LIKE '%<script%'"

# Enable Content Security Policy in .htaccess (Apache)
# Add to your site's .htaccess file:
# Header set Content-Security-Policy "default-src 'self'; script-src 'self'"