Plugin Name	Master Addons for Elementor
Type of Vulnerability	Cross-Site Scripting (XSS)
CVE Number	CVE-2024-5542
Urgency	Medium
CVE Publish Date	2026-02-13
Source URL	CVE-2024-5542

Urgent Security Advisory — CVE-2024-5542: Unauthenticated Stored XSS in Master Addons for Elementor (≤ 2.0.6.1) and How to Protect Your Sites

Expert technical analysis, detection strategies, mitigation steps, and comprehensive guidance from the Managed-WP Security Team. Understand the mechanics of this unauthenticated stored XSS vulnerability, immediate containment practices, long-term hardening methods, and how Managed-WP fortifies your WordPress sites while you update.

Author: Managed-WP Security Team
Date: 2026-02-11
Tags: WordPress, XSS, WAF, Plugin Vulnerability, Master Addons, Elementor

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Summary: A stored Cross-Site Scripting (XSS) vulnerability identified as CVE-2024-5542 (CVSS 7.2) affects Master Addons for Elementor plugin versions ≤ 2.0.6.1. This flaw permits unauthenticated attackers to inject malicious scripts via the Navigation Menu widget that execute within users’ browsers upon page load. This advisory covers the technical workings of the issue, risk assessment, detection approaches, immediate containment, and how Managed-WP safeguards your assets until official patches are applied.

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Table of Contents

• Quick Facts
• Understanding Stored XSS and Its Risks
• Technical Overview of the Vulnerability in the Navigation Menu Widget
• Who is Vulnerable and Potential Consequences
• Indicators of Compromise (IoCs) and Signs to Monitor
• Immediate Containment: Step-by-Step Actions
• Investigation & Detection: Queries, Commands, Logs
• Virtual Patching and WAF Rule Recommendations
• Long-Term Development Guidance and Remediation
• Incident Response and Recovery Best Practices
• How Managed-WP Protects Your Site Now
• Getting Started with Managed-WP Protection Plans
• Concluding Notes and Recommended Reading

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Quick Facts

• Vulnerability Type: Unauthenticated Stored Cross-Site Scripting (XSS)
• Impacted Software: Master Addons for Elementor (WordPress plugin)
• Affected Versions: 2.0.6.1 and earlier
• Fixed Version: 2.0.6.2 (urgent update advised)
• CVE ID: CVE-2024-5542
• CVSS v3.1 Score: 7.2 (High / Medium rating depending on context)
• Privilege Required: None (exploitable without authentication)
• Potential Impact: Execution of malicious scripts on visitors’ browsers, cookie theft, forced actions, iframe injection, and potential privilege escalation.

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Understanding Stored XSS and Its Risks

Stored Cross-Site Scripting (XSS) occurs when malicious scripts supplied by an attacker are permanently stored by an application (e.g., in a database or widget settings) and later displayed to users without effective sanitization or escaping. Unlike reflected XSS, which is non-persistent and requires tricking users into clicking crafted URLs, stored XSS triggers for anyone loading the affected page.

Why this vulnerability is critical:

• Persistence: Malicious payloads remain until explicitly removed.
• Broad Exposure: Widgets such as navigation menus are often site-wide and heavily accessed.
• Increased Risk for Admins: Scripts executing in admin browsers can hijack privileged sessions and escalate attacks.
• Data Theft & Hijacking: Attackers can steal cookies, tokens, or perform actions on behalf of users.
• SEO and Brand Damage: Injection of spam or malicious code harms search rankings and user trust.

The unauthenticated nature of this vulnerability dramatically escalates urgency to remediate.

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Technical Overview of the Vulnerability in the Navigation Menu Widget

This vulnerability stems from insufficient authorization and output sanitization in the Navigation Menu widget of Master Addons:

• The widget accepts inputs for menu labels and settings.
• It lacks proper checks validating that requests updating menu data come from authenticated and authorized users.
• Malicious scripts submitted unchecked get stored and later output without adequate escaping, leading to script execution in user browsers.
• The attack vector involves crafting POST or RESTful requests that inject malicious JavaScript payloads.

Attack flow (conceptual):

1. Unrestricted HTTP request submits malicious script within menu/widget fields.
2. Plugin stores this script as part of menu data.
3. Pages rendering the navigation widget output the malicious code directly.
4. Victims’ browsers execute injected scripts.

Managed-WP strongly recommends immediate update to version 2.0.6.2, which implements essential authorization and sanitization fixes.

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Who is Vulnerable and Potential Consequences

At Risk:

• All websites running Master Addons for Elementor version 2.0.6.1 or older.
• Websites with the affected Navigation Menu widget enabled, or any similar widget leveraging the same vulnerable component.
• Sites with public traffic where unauthenticated attackers can send malicious input.
• Sites with logged-in admins or privileged users visiting front-end pages.

Possible Threats and Outcomes:

• Visitors exposed to unauthorized redirects, pop-ups, or malicious downloads.
• Theft or manipulation of authentication cookies and sensitive tokens for logged-in users.
• Account takeover attacks targeting site administrators via session hijacking.
• Insertions of spam, malware, or SEO-toxic content via injected scripts.
• Persistent JavaScript backdoors communicating with attacker infrastructure.
• Potential legal and reputational fallout from data breaches.

This vulnerability must be treated as a high priority for patching and containment.

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Indicators of Compromise (IoCs) and Signs to Monitor

To detect possible compromise, monitor for the following signs:

• Unusual or unknown menu entries via WordPress menu management interfaces.
• Database records for menu items containing HTML script tags or suspicious event handler attributes.
• Front-end rendering of inline <script> tags or unexpected JavaScript event handlers in navigation elements.
• Sporadic redirects, dialog popups, or external resource loads on pages with navigation widgets.
• Unexpected file changes, new files in WordPress root or plugin directories.
• Spike in failed or suspicious login attempts, indicating potential credential stuffing.
• Suspicious POST requests targeting menu or widget endpoints, especially from unfamiliar IP addresses.

Example malicious patterns to watch for:

• Script tags (<script>), image tags with onerror handlers (<img src=x onerror=…>), iframe tags, or data URLs within menu item titles.
• Unauthenticated REST or AJAX calls modifying menu data.
• Unusual WAF or server log entries showing large payload POSTs to widget-related endpoints.

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Investigation & Detection: Queries, Commands, Logs

Below are tested commands and queries that can assist in identifying injected content or suspicious activity. Use caution, test on staging, and backup before performing destructive actions.

1. SQL Query: Find nav menu items with <script> or event attributes

   SELECT ID, post_title, post_content, post_excerpt
   FROM wp_posts
   WHERE post_type = 'nav_menu_item'
     AND (
       post_title LIKE '%<script%'
       OR post_title LIKE '%onerror=%'
       OR post_content LIKE '%<script%'
       OR post_excerpt LIKE '%<script%'
     );

2. SQL Query: Look for “javascript:” and event handlers

   SELECT ID, post_title, post_excerpt
   FROM wp_posts
   WHERE post_type = 'nav_menu_item'
     AND (
       post_title REGEXP 'javascript:|onerror\\s*=|onclick\\s*=|onload\\s*='
       OR post_excerpt REGEXP 'javascript:|onerror\\s*=|onclick\\s*=|onload\\s*='
     );

3. WP-CLI Search: Detect suspicious nav menu titles

   wp db query "SELECT ID, post_title FROM wp_posts WHERE post_type = 'nav_menu_item' AND (post_title LIKE '%<script%' OR post_title LIKE '%onerror=%');"

4. File & Directory Checks (Server-side)

   # Find recently modified files
   find /path/to/wordpress -type f -mtime -7 -print
   
   # Search for early script tags in theme & plugin files
   grep -R --line-number "<script" /path/to/wordpress/wp-content/themes /path/to/wordpress/wp-content/plugins 2>/dev/null

5. Web Server Logs: Identify suspicious POST requests

   grep "POST .*admin-ajax.php" /var/log/nginx/access.log | tail -n 200

   Monitor request payloads if available, particularly targeting admin ajax and REST routes.

6. Browser Inspection
   • Inspect page elements in affected areas for unexpected <script> tags or inline event handlers.
   • Review the browser console for suspicious errors or network requests.
7. File Integrity Checks
   Compare current files against clean backups to identify unauthorized changes.

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Immediate Containment: Step-by-Step Actions

Sites running vulnerable versions should prioritize these urgent steps:

1. Update Master Addons Plugin
   Immediately upgrade to version 2.0.6.2 or later to implement official fixes.
2. If Update is Not Immediately Possible, Disable Plugin or Vulnerable Widgets
   Deactivate the Master Addons plugin or remove the Navigation Menu widget from active pages.
3. Apply Web Application Firewall (WAF) Rules
   Block unauthenticated POST and REST requests attempting to modify menu/widget data.
   Filter payloads containing script tags or suspicious event handlers.
   Implement rate limiting or block suspicious IP sources.
4. Scan and Remove Malicious Menu Items
   Use database queries to locate and sanitize or remove poisoned menu records.
   Consider restoring from a pre-infection backup if necessary.
5. Rotate Passwords and API Secrets
   Update admin/user passwords and any API keys potentially exposed.
6. Conduct Malware Scanning
   Perform comprehensive scans on files and databases to detect further infections or backdoors.
7. Monitor Logs and Site Activity
   Heighten vigilance for unusual login patterns, traffic anomalies, and outbound connections.
8. Communication Readiness
   Prepare notification processes in case sensitive data exposure is suspected.

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Virtual Patching and WAF Rule Recommendations

When immediate patching isn’t feasible, virtual patching with a robust WAF offers crucial protective cover. Below are suggested rule outlines to help mitigate exploitation risk. These should be customized and tested within your environment.

Guidelines for effective rule creation:

• Precisely target vulnerable endpoints and request parameters.
• Block or flag inputs containing scripting-related tags or attributes such as <script>, onerror=, javascript:, onload=, onclick=.
• Enforce method restrictions and nonce/capability validation.
• Rate limit or block IPs exhibiting abusive request behaviors.

Example WAF Rule Patterns (Conceptual):

1. Block requests with inline <script> tags in menu or widget parameters:
   If any parameter matching /(menu|nav).*title|widget.*content/i contains /<script\b/i, block the request.
2. Block event-handler attributes:
   If a parameter contains /(onerror|onload|onclick|onmouseover|onfocus)\s*=/i, block.
3. Block parameters starting with the javascript: URI scheme:
   Match ^javascript: case-insensitive.
4. Enforce WP nonce and capability validation:
   Block requests without a valid nonce token on expected endpoints.
5. Block unauthenticated plugin REST or AJAX calls trying to mutate menus/widgets.
6. Monitor newly created nav_menu_item records for HTML/comment tags and alert.

Sample WAF Signature (Pseudo YAML format):

- name: block_nav_menu_script_tags
  match:
    - param_name: /(menu|nav).*title|widget.*content/i
      operator: regex
      value: /<\s*script\b|javascript:|on(error|load|click|mouseover)\s*=/i
  action: block
  message: "Blocked potential stored XSS attempt targeting menu/widget content"

Note: Avoid blocking legitimate HTML fields if your site requires them. Focus on fields utilized by the vulnerable navigation menu widget.

Additionally, deploying a strict Content Security Policy (CSP) can curb impact by limiting inline scripts and untrusted sources. A sample CSP header (to test cautiously):

Content-Security-Policy: default-src 'self'; script-src 'self' https://trusted.cdn.example.com; object-src 'none'; base-uri 'self'; frame-ancestors 'none'; style-src 'self' 'unsafe-inline' https://trusted.cdn.example.com;

Minimize ‘unsafe-inline’ script allowance for best XSS protection.

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Long-Term Development Guidance and Remediation

Developers and site maintainers should apply these best practices to prevent similar flaws:

• Strict Authorization Controls
  • Enforce capability checks (e.g., current_user_can( 'manage_options' )) before modifying data.
  • Implement nonce verification for AJAX and REST endpoints (e.g., check_ajax_referer()).
• Sanitize on Input, Escape on Output
  • Use sanitizers like sanitize_text_field or wp_kses_post on write.
  • Escape outputs with esc_html, esc_attr, esc_url, or allowed HTML filters.
• Principle of Least Privilege
  • Do not expose unauthenticated endpoints that accept user-generated content.
  • Restrict allowed HTML tags and attributes strictly where HTML is necessary.
• Avoid Storing Raw HTML From Untrusted Sources
  • Where fields should be plain text (like menu titles), enforce text-only sanitization.
• Testing and Validation
  • Include security regression tests for XSS injection attempts.
  • Automate capability checks verification in code.
• Secure Defaults
  • Default widget and shortcode outputs should be sanitized unless explicitly configured by authorized admins.

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Incident Response and Recovery Best Practices

Upon confirmed exploitation, follow a structured incident response:

1. Containment
   Disable the vulnerable plugin or features and consider placing your site into maintenance mode.
2. Preserve Evidence
   Secure copies of system logs, database snapshots, and files for forensic analysis.
3. Eradication
   Clean malicious payloads from database and remove any backdoor files.
4. Recovery
   Restore from clean backups if available and apply patched plugin versions immediately.
5. Post-Incident Activities
   Rotate all credentials and tokens, monitor for re-infections, and pinpoint root vulnerabilities to close.
6. Communication
   Notify affected parties complying with legal requirements if user data was exposed.

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How Managed-WP Protects Your Site Now

Managed-WP offers dedicated WordPress security with features tailored to defend against vulnerabilities like CVE-2024-5542:

• Advanced Managed Web Application Firewall (WAF)
  Deploys targeted virtual patches blocking exploit attempts on vulnerable plugins prior to patching, minimizing risk of stored XSS and other common attacks.
• Continuous Real-Time Malware Scanning
  Monitors files and databases for script injections, suspicious modifications, and signs of compromise.
• Mitigation of OWASP Top 10 Risks
  Pre-configured defenses that address injection, broken access control, XSS, and other common vulnerabilities.
• Unlimited Bandwidth with Low Latency
  Ensures robust protection without impacting user experience for sites of all sizes.
• Flexible Security Plans
  From Basic (Free) with essential protection and malware scanning, to advanced plans featuring automated remediation, vulnerability patching, and expert concierge support.

Sites unable to patch immediately benefit from Managed-WP’s virtual patching and monitoring, which significantly reduce the attack surface and provide peace of mind during vulnerability windows.

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Getting Started with Managed-WP Protection Plans

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Concluding Notes and Recommended Reading

This vulnerability underscores the critical importance of strict authorization and sanitization within WordPress plugins to maintain security. The fastest and safest resolution is updating Master Addons to version 2.0.6.2 or higher. Until then, we advise immediate implementation of containment and virtual patching along with thorough investigation.

Our Managed-WP team stands ready to assist in tailored virtual patch deployment, real-time scanning, and elevated security monitoring to shield your site now.

Practice layered security measures, prioritize timely patching, and maintain vigilance—these are cornerstones of strong WordPress defense.

— Managed-WP Security Team

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Appendix: Quick Security Checklist

• Verify Master Addons plugin version (2.0.6.1 or below is vulnerable)
• Upgrade to 2.0.6.2 or later as soon as possible
• If immediate update is impossible, disable the plugin or navigation menu widget
• Apply WAF rules blocking script payloads targeting menu/widget content
• Search WordPress database for nav_menu_item entries containing <script> or other suspicious code
• Clean or remove any infected menu item records
• Rotate administrative passwords and API secrets
• Conduct thorough malware scans of files and database
• Preserve logs and evidence if compromise is suspected
• Implement long-term security improvements: CSP deployment, sanitize inputs, strict capability checks, and escape outputs

For professional hands-on support or rapid mitigation, consider Managed-WP’s tailored protection plans providing immediate virtual patching and comprehensive detection:

https://managed-wp.com/pricing

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