CVE-2025-14888: WordPress User Meta Editor XSS Vulnerability

CVE-2025-14888 Overview

CVE-2025-14888 is a Stored Cross-Site Scripting (XSS) vulnerability in the Simple User Meta Editor plugin for WordPress, affecting all versions up to and including 1.0.0. The flaw resides in the user meta value field, where the plugin fails to properly sanitize input and escape output. Authenticated attackers with administrator-level access can inject arbitrary JavaScript that executes when users view affected pages. The issue impacts only multi-site installations and installations where the unfiltered_html capability has been disabled. The vulnerability is classified under [CWE-79] (Improper Neutralization of Input During Web Page Generation).

Critical Impact
Authenticated administrators on WordPress multi-site networks can persist JavaScript payloads in user meta records, leading to script execution in any browser session that renders the injected content.

Affected Products

Simple User Meta Editor plugin for WordPress (all versions through 1.0.0)
WordPress multi-site installations using the plugin
WordPress installations where unfiltered_html capability is disabled

Discovery Timeline

2026-01-07 - CVE-2025-14888 published to NVD
2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-14888

Vulnerability Analysis

The Simple User Meta Editor plugin provides administrators with an interface to view and modify user meta values stored in the WordPress database. The plugin renders these meta values back to the administrative UI without applying the WordPress escaping APIs such as esc_html(), esc_attr(), or wp_kses(). As a result, JavaScript payloads stored in user meta fields are rendered as live markup when an administrator or another authorized user opens the editor page.

The stored nature of the flaw makes the payload persist across sessions until the offending meta value is removed. Each subsequent page load that renders the meta value triggers script execution in the victim's browser context, inheriting the privileges of the viewing session. The vulnerable template logic can be reviewed in the WordPress Plugin Template Code.

Root Cause

The root cause is insufficient input sanitization on write and missing output escaping on read. The plugin trusts that only privileged users will interact with the meta editor and therefore omits the defensive encoding layer that WordPress expects for any value reflected to the DOM. This trust assumption breaks down in WordPress multi-site environments and configurations where unfiltered_html is disabled, because in those contexts administrators are not granted permission to submit raw HTML or scripts.

Attack Vector

An attacker who has obtained administrator credentials on an affected WordPress multi-site installation submits a payload through the user meta value field. The payload is stored in the wp_usermeta table. When any user with access to the editor renders the affected page, the browser parses and executes the embedded script. The attacker can use the resulting execution to perform actions on behalf of the viewing user, exfiltrate session data, or pivot to other administrative functionality. Exploitation requires high privileges, no user interaction beyond viewing the page, and operates over the network. Additional technical context is available in the Wordfence Vulnerability Detail #37342.

No verified proof-of-concept code is publicly available. The vulnerability is described in prose because no realCodeExamples were provided and synthetic exploit code is not generated.

Detection Methods for CVE-2025-14888

Indicators of Compromise

Entries in the wp_usermeta table containing HTML tags such as <script>, <img onerror=>, or <svg onload=> within meta_value columns.
Unexpected outbound HTTP requests originating from administrator browser sessions shortly after the user meta editor is loaded.
Audit log entries showing administrator-level updates to user meta fields through the Simple User Meta Editor interface.

Detection Strategies

Query the WordPress database for user meta values containing common XSS payload patterns and review any matches manually.
Inspect HTTP response bodies served by /wp-admin/ pages rendered by the plugin for unescaped script content.
Correlate administrator login events with subsequent user meta modifications to identify suspicious editing patterns.

Monitoring Recommendations

Enable WordPress administrative action logging through a security plugin and forward events to a centralized SIEM.
Monitor for newly created or modified administrator accounts on multi-site networks, since administrator access is a prerequisite for exploitation.
Alert on browser-side Content Security Policy (CSP) violations originating from /wp-admin/ pages.

How to Mitigate CVE-2025-14888

Immediate Actions Required

Disable the Simple User Meta Editor plugin until a patched release is available.
Audit existing user meta records for stored HTML or JavaScript content and remove any unauthorized entries.
Review the administrator account roster and revoke access for any accounts that should not retain administrative privileges.

Patch Information

At the time of publication, all versions up to and including 1.0.0 of the Simple User Meta Editor plugin are affected, and no fixed version is referenced in the NVD record. Monitor the plugin page and the Wordfence Vulnerability Detail #37342 entry for an updated release, and apply the patched version as soon as it is published.

Workarounds

Restrict administrator access on multi-site networks to a minimal set of trusted accounts and enforce multi-factor authentication.
Deploy a Content Security Policy that blocks inline script execution within the WordPress admin interface.
Use a web application firewall rule set to inspect and block script payloads submitted to plugin endpoints.

bash

# Configuration example: deactivate the plugin via WP-CLI until a patch is released
wp plugin deactivate simple-user-meta-editor --network
wp plugin status simple-user-meta-editor