CVE-2025-46253: Wpmet Gutenkit XSS Vulnerability

CVE-2025-46253 Overview

CVE-2025-46253 is a stored Cross-Site Scripting (XSS) vulnerability in the GutenKit plugin (gutenkit-blocks-addon) for WordPress, developed by Ataur R (wpmet). The flaw affects all versions up to and including 2.2.2. The plugin fails to properly neutralize user-supplied input during web page generation, allowing an authenticated attacker with low privileges to inject malicious scripts. Those scripts execute in the browser of any user who views the affected page. The issue is tracked under CWE-79 and was published on April 22, 2025.

Critical Impact
An authenticated contributor-level attacker can store JavaScript payloads that execute against site visitors and administrators, enabling session theft, redirection, and content manipulation.

Affected Products

GutenKit (gutenkit-blocks-addon) versions through 2.2.2
WordPress sites using the wpmet GutenKit blocks addon
Any GutenKit deployment where untrusted users can author block content

Discovery Timeline

2025-04-22 - CVE-2025-46253 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-46253

Vulnerability Analysis

GutenKit extends the WordPress Gutenberg editor with additional blocks and design components. The vulnerability resides in how one or more of these blocks handle user-controlled attributes during server-side rendering. The plugin accepts input from an authenticated user and writes it into the rendered HTML without sufficient escaping.

Because the payload is stored in the post or block content, it executes every time the affected page loads. An attacker with the ability to edit posts (for example, a contributor or author) can plant scripts that later run in an administrator's session. The impact scope changes because the injected code executes in a different security context than the attacker's own.

Root Cause

The root cause is improper neutralization of input during web page generation, classified as CWE-79. GutenKit does not consistently apply WordPress escaping functions such as esc_attr(), esc_html(), or wp_kses_post() to block attributes before emitting them into the DOM. As a result, HTML control characters and <script> payloads survive rendering.

Attack Vector

Exploitation requires network access to the WordPress site and an authenticated account with editing privileges. The attacker inserts a crafted GutenKit block containing a JavaScript payload in a vulnerable attribute field. When a victim, typically an administrator reviewing content, loads the page, the browser executes the stored script. User interaction is required to trigger the payload. Further exploitation details are available in the Patchstack Vulnerability Report.

No public proof-of-concept code has been released for this issue, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

Detection Methods for CVE-2025-46253

Indicators of Compromise

Unexpected <script>, onerror, onload, or javascript: strings stored in WordPress wp_posts content for GutenKit blocks.
Outbound requests from administrator browsers to unknown domains shortly after loading pages that contain GutenKit blocks.
New administrator accounts or modified user roles created shortly after an editor session viewing a contributor-authored post.

Detection Strategies

Query the database for GutenKit block markup containing HTML event handlers or script tags: SELECT ID FROM wp_posts WHERE post_content LIKE '%wp:gutenkit%' AND post_content REGEXP '(<script|onerror=|onload=|javascript:)'.
Review WordPress audit logs for post edits by low-privilege users that introduce GutenKit blocks with unusually long attribute values.
Deploy a Content Security Policy (CSP) in report-only mode to surface inline script violations originating from plugin-rendered pages.

Monitoring Recommendations

Monitor plugin update status and alert when GutenKit installations remain on versions at or below 2.2.2.
Track privileged user browser telemetry for anomalous DOM behavior or credential-form injection on /wp-admin/ pages.
Alert on modifications to wp_options, wp_users, or theme files that follow content edits by non-administrator accounts.

How to Mitigate CVE-2025-46253

Immediate Actions Required

Update GutenKit to a version later than 2.2.2 as soon as a fixed release is available from the vendor.
Audit all existing GutenKit block content for injected scripts or suspicious HTML attributes and remove offending posts.
Restrict post-editing capabilities to trusted accounts and require multi-factor authentication for all editor and administrator roles.

Patch Information

Refer to the Patchstack Vulnerability Report for the current patched version and vendor guidance. Apply the update through the WordPress plugin manager or by replacing the plugin directory with the fixed release.

Workarounds

Deactivate the GutenKit plugin until a patched version is installed if editorial workflows can tolerate the removal.
Enforce a strict Content Security Policy that blocks inline scripts and untrusted external script sources on both the front end and /wp-admin/.
Use a web application firewall rule set that inspects POST bodies to /wp-json/wp/v2/posts and /wp-admin/post.php for HTML event handlers in GutenKit attributes.

bash

# Example CSP header applied via web server configuration
add_header Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'self'" always;