CVE-2025-11824: Cinza Grid WordPress Plugin XSS Vulnerability

CVE-2025-11824 Overview

CVE-2025-11824 is a Stored Cross-Site Scripting (XSS) vulnerability in the Cinza Grid plugin for WordPress. The flaw affects all plugin versions up to and including 1.2.1. It stems from insufficient input sanitization and output escaping on the cgrid_skin_content post meta field. Authenticated users with contributor-level access or higher can inject arbitrary JavaScript that executes when other users view the affected page. The issue is tracked under CWE-79 and was patched in WordPress plugin changeset #3381619.

Critical Impact
Contributor-level attackers can persist JavaScript payloads that execute in the browsers of site visitors and administrators, enabling session theft, forced actions, and defacement.

Affected Products

WordPress Cinza Grid plugin versions up to and including 1.2.1
WordPress sites permitting contributor-level user registration
WordPress installations rendering cgrid_skin_content post meta on public pages

Discovery Timeline

2025-10-22 - CVE-2025-11824 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-11824

Vulnerability Analysis

The Cinza Grid plugin stores custom skin content in a post meta field named cgrid_skin_content. The plugin writes this value to WordPress meta storage without applying sanitization callbacks such as wp_kses_post or sanitize_text_field. When the plugin later renders the meta value through its shortcode and custom post type templates, it emits the content directly into the HTML response without escaping helpers such as esc_html or esc_attr.

Contributor accounts in WordPress can create draft posts and edit their own post meta. This access level is sufficient to write malicious HTML or JavaScript into cgrid_skin_content. Once an editor or administrator publishes or previews the affected post, the injected script executes in the victim's authenticated session.

Relevant plugin source locations are the custom post type handler in backend-cpts.php line 733 and the shortcode renderer in backend-shortcodes.php line 511.

Root Cause

The root cause is a dual failure: the plugin neither sanitizes user-supplied HTML on input to cgrid_skin_content nor escapes it on output. This aligns with the classic Stored XSS pattern described in CWE-79.

Attack Vector

An attacker authenticates to WordPress with a contributor account, creates or edits a Cinza Grid post, and submits a payload such as an event-handler attribute or script tag into the cgrid_skin_content meta field. When any visitor loads the rendered page, the browser executes the injected script under the site's origin.

Vulnerability described in prose only - no verified exploit code available.
See the Wordfence advisory and WordPress plugin source references above for technical details.

Detection Methods for CVE-2025-11824

Indicators of Compromise

Post meta rows where meta_key = 'cgrid_skin_content' contain <script> tags, on* event handlers, or javascript: URIs
Unexpected outbound requests from administrator browsers to attacker-controlled domains after viewing Cinza Grid pages
Newly created contributor accounts followed by rapid post creation using Cinza Grid custom post types

Detection Strategies

Query the wp_postmeta table for the cgrid_skin_content key and flag values containing HTML script markers or encoded JavaScript patterns
Deploy a web application firewall rule that inspects POST requests to /wp-admin/post.php for XSS payloads targeting Cinza Grid fields
Review WordPress audit logs for contributor accounts editing posts of the Cinza Grid custom post type

Monitoring Recommendations

Alert on Content Security Policy violations reported by browsers loading pages that render Cinza Grid shortcodes
Monitor administrator session activity for unexpected privilege changes or REST API calls following page previews
Track plugin version inventory and flag any WordPress instance still running Cinza Grid 1.2.1 or earlier

How to Mitigate CVE-2025-11824

Immediate Actions Required

Update the Cinza Grid plugin to the version released in changeset #3381619, which addresses the sanitization gap
Audit all posts using Cinza Grid custom post types and remove any injected script content from the cgrid_skin_content meta field
Review contributor and author accounts, disable unused accounts, and rotate credentials for accounts that edited affected posts

Patch Information

The vendor fixed the flaw in the Cinza Grid plugin release following version 1.2.1, applied via WordPress plugin changeset #3381619. Full details are available in the Wordfence Vulnerability Report.

Workarounds

Restrict contributor-level account creation until the patched plugin version is installed
Deactivate the Cinza Grid plugin if the patched release cannot be deployed immediately
Enforce a strict Content Security Policy that disallows inline scripts on pages rendering Cinza Grid content

bash

# Identify posts with suspicious cgrid_skin_content meta values
wp db query "SELECT post_id, LEFT(meta_value, 200) AS snippet \
  FROM wp_postmeta \
  WHERE meta_key = 'cgrid_skin_content' \
    AND (meta_value LIKE '%<script%' \
         OR meta_value LIKE '%javascript:%' \
         OR meta_value REGEXP 'on[a-z]+=');"