CVE-2025-9499: Ocean Extra Plugin Stored XSS Vulnerability

CVE-2025-9499 Overview

CVE-2025-9499 is a Stored Cross-Site Scripting (XSS) vulnerability in the Ocean Extra plugin for WordPress. The flaw affects all versions up to and including 2.4.9 and resides in the plugin's oceanwp_library shortcode. Insufficient input sanitization and output escaping on user-supplied attributes allow authenticated users with contributor-level access or above to inject arbitrary JavaScript. The injected scripts execute in the browser of any user who views an affected page. The issue is tracked under [CWE-79] and was published to the National Vulnerability Database on August 30, 2025.

Critical Impact
Authenticated contributors can inject persistent JavaScript into WordPress pages, enabling session theft, administrative action hijacking, and malicious redirects for site visitors.

Affected Products

Ocean Extra plugin for WordPress, all versions up to and including 2.4.9
WordPress sites running the OceanWP theme ecosystem with Ocean Extra installed
Any WordPress deployment granting contributor-level or higher accounts to untrusted users

Discovery Timeline

2025-08-30 - CVE-2025-9499 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-9499

Vulnerability Analysis

The vulnerability resides in the Ocean Extra plugin's oceanwp_library shortcode handler, defined in includes/panel/library-shortcode.php. The shortcode accepts user-supplied attributes that are rendered back into page output without adequate sanitization or escaping. When a contributor or higher-privileged user embeds the shortcode with crafted attribute values, the resulting HTML carries attacker-controlled JavaScript into the rendered page.

Because the payload persists in post content, every subsequent visitor, including administrators previewing or publishing the page, executes the injected script in their authenticated browser session. This elevates a contributor-level account into a vector for taking actions as higher-privileged users, exfiltrating cookies, or pivoting to further compromise.

Root Cause

The root cause is missing input sanitization and missing output escaping on shortcode attributes handled by the oceanwp_library shortcode callback. WordPress provides helpers such as esc_attr(), esc_html(), wp_kses(), and sanitize_text_field() for this purpose, but the vulnerable code path renders user input into the DOM without applying them. See the WordPress Plugin Code Snippet and the fix in WordPress Changeset #3351880.

Attack Vector

Exploitation requires an authenticated session with contributor privileges or higher. The attacker crafts a post or page containing the oceanwp_library shortcode with malicious attribute values. When the content is rendered, the browser parses the attacker's JavaScript as part of the trusted page origin. The attack is network-reachable, requires no user interaction beyond normal page viewing, and persists until the content is removed or the plugin is patched.

The vulnerability is described in prose only. No verified public proof-of-concept code is referenced in the advisory. Technical specifics are documented in the Wordfence Vulnerability Report.

Detection Methods for CVE-2025-9499

Indicators of Compromise

Posts or pages containing the [oceanwp_library] shortcode with attribute values that include <script>, javascript:, onerror=, onload=, or encoded script payloads
Unexpected new contributor, author, or administrator accounts created shortly after suspicious page edits
Outbound requests from administrator browsers to attacker-controlled domains following page previews

Detection Strategies

Audit the wp_posts table for shortcode usage with suspicious attribute content using SQL queries that search post_content for oceanwp_library combined with HTML or script tokens
Review WordPress audit logs for shortcode insertions by contributor-level accounts, especially on recently created pages
Deploy a web application firewall rule that inspects rendered HTML for script content inside Ocean Extra shortcode output

Monitoring Recommendations

Monitor Content Security Policy (CSP) violation reports for inline script executions on pages that render Ocean Extra content
Alert on contributor accounts that submit posts containing shortcodes with HTML-like attribute values
Track plugin version inventory across all WordPress sites and flag any Ocean Extra instance at or below version 2.4.9

How to Mitigate CVE-2025-9499

Immediate Actions Required

Update the Ocean Extra plugin to the version released in WordPress Changeset #3351880, which adds the missing sanitization and escaping
Review all existing posts and pages for malicious use of the oceanwp_library shortcode and remove injected payloads
Rotate credentials for administrator accounts that may have viewed compromised pages while authenticated

Patch Information

The maintainers of Ocean Extra addressed the vulnerability by sanitizing shortcode attributes and escaping output in the oceanwp_library handler. Site operators should install the fixed release available on the Ocean Extra Plugin page and verify the deployed version is newer than 2.4.9.

Workarounds

Restrict contributor, author, and editor roles to trusted users only until the patched plugin version is deployed
Temporarily disable the Ocean Extra plugin on sites where immediate patching is not possible
Enforce a strict Content Security Policy that disallows inline scripts to limit the impact of injected XSS payloads

bash

# Check installed Ocean Extra version via WP-CLI and update
wp plugin get ocean-extra --field=version
wp plugin update ocean-extra

# Audit posts for suspicious oceanwp_library shortcode usage
wp db query "SELECT ID, post_title FROM wp_posts \
  WHERE post_content LIKE '%[oceanwp_library%' \
  AND (post_content LIKE '%<script%' OR post_content LIKE '%javascript:%' OR post_content LIKE '%onerror=%');"