CVE-2025-7400: WordPress FIFU Plugin XSS Vulnerability

CVE-2025-7400 Overview

CVE-2025-7400 is a stored Cross-Site Scripting (XSS) vulnerability in the Featured Image from URL (FIFU) plugin for WordPress. The flaw affects all versions up to and including 5.2.7 and stems from insufficient input sanitization and output escaping in a post's Featured Image custom fields. Authenticated attackers with Contributor-level access or higher can inject arbitrary JavaScript that executes in the browser of any user who views an affected page. The vendor partially addressed the issue in version 5.2.2, but the complete fix did not land until a later release.

Critical Impact
Authenticated contributors can store malicious scripts in posts that execute in visitors' and administrators' browsers, enabling session theft, defacement, or administrative account takeover.

Affected Products

Featured Image from URL (FIFU) plugin for WordPress — all versions up to and including 5.2.7
WordPress sites that permit Contributor-level or higher accounts to use the FIFU plugin
Partial fix shipped in version 5.2.2; full remediation requires a later patched release

Discovery Timeline

2025-10-07 - CVE-2025-7400 published to NVD
2026-10-08 - Last updated in NVD database

Technical Details for CVE-2025-7400

Vulnerability Analysis

The vulnerability is a stored Cross-Site Scripting flaw classified under CWE-79. The FIFU plugin exposes custom fields that allow users to attach a Featured Image to a post using an external URL. These custom field values are rendered back into post pages without sufficient sanitization on input or escaping on output. An attacker holding a Contributor account, which is a low-privilege role typically granted to guest authors, can inject HTML and JavaScript payloads through these fields. When editors, administrators, or site visitors load the affected post, the payload executes in their browser session.

Root Cause

The root cause is missing sanitization and escaping on the Featured Image custom field values handled by the plugin. WordPress provides functions such as sanitize_text_field() and esc_url() for storing untrusted input, and esc_attr() or esc_html() for rendering. The plugin failed to apply appropriate escaping before echoing custom field values back into generated HTML. The vendor's partial fix in version 5.2.2 closed some code paths but left others exploitable, which is why the CVE applies to all releases through 5.2.7.

Attack Vector

Exploitation requires an authenticated account with Contributor-level permissions or higher. The attacker edits a post and supplies a malicious payload — for example, an onerror handler embedded in a crafted image URL or raw script content — through FIFU's Featured Image custom field. Once the post is saved and later rendered, the stored payload executes in the browser of any user viewing the page. Because the Scope is Changed in the CVSS vector, the stored script can impact users beyond the vulnerable component, including administrators whose session cookies and nonces can be stolen to escalate privileges.

No verified public exploit code is available at the time of writing. For technical specifics, consult the Wordfence Vulnerability Report and the WordPress Change Log Entry.

Detection Methods for CVE-2025-7400

Indicators of Compromise

Post meta records containing <script>, onerror=, onload=, or javascript: strings in FIFU-related custom fields such as fifu_image_url
Unexpected outbound requests from administrator browsers to attacker-controlled domains shortly after viewing posts authored by Contributor accounts
New administrator accounts, modified user roles, or plugin changes initiated from administrator sessions with no corresponding legitimate activity

Detection Strategies

Query the wp_postmeta table for FIFU custom field keys and inspect values for HTML tags, event handlers, or non-URL content
Review audit logs for Contributor or Author accounts that recently edited Featured Image URL fields, particularly on posts later viewed by privileged users
Monitor web server access logs for responses containing injected <script> content served from post pages

Monitoring Recommendations

Enable a WordPress activity log plugin to track custom field changes and role modifications
Deploy Content Security Policy (CSP) headers in report-only mode to surface unexpected inline script execution on front-end pages
Alert on creation or privilege elevation of WordPress user accounts following Contributor-authored content changes

How to Mitigate CVE-2025-7400

Immediate Actions Required

Update the Featured Image from URL (FIFU) plugin to the latest version beyond 5.2.7 that fully remediates the issue
Audit existing posts and wp_postmeta entries for malicious payloads in FIFU custom fields and sanitize or remove suspicious values
Review Contributor and Author accounts, rotating credentials for any accounts showing unexpected post edits

Patch Information

The vendor applied a partial fix in version 5.2.2 and completed remediation in a subsequent release referenced in the WordPress Change Log Entry. Site operators should install the newest available version of the plugin from the WordPress plugin repository. Additional vulnerability detail is documented in the Wordfence Vulnerability Report.

Workarounds

Deactivate the FIFU plugin until the patched version is installed if updating immediately is not feasible
Restrict Contributor-level account creation and limit which roles can edit posts containing Featured Image URL fields
Enforce a strict Content Security Policy that blocks inline scripts and restricts script sources to trusted origins

bash

# Example WP-CLI commands to update the plugin and audit custom fields
wp plugin update featured-image-from-url
wp db query "SELECT post_id, meta_key, meta_value FROM wp_postmeta \
  WHERE meta_key LIKE 'fifu_%' \
  AND (meta_value LIKE '%<script%' \
       OR meta_value LIKE '%onerror=%' \
       OR meta_value LIKE '%javascript:%');"