CVE-2025-31627: Media Library Assistant Stored XSS Flaw

CVE-2025-31627 Overview

CVE-2025-31627 is a stored cross-site scripting (XSS) vulnerability in the Media Library Assistant WordPress plugin developed by David Lingren. The flaw affects all plugin versions up to and including 3.24. It stems from improper neutralization of user-supplied input during web page generation, classified under [CWE-79]. An authenticated attacker with high privileges can inject malicious script payloads that persist in the database and execute in the browsers of other users who view the affected pages. The vulnerability requires user interaction and results in a scope change, allowing the injected script to affect resources beyond the vulnerable component.

Critical Impact
Stored XSS payloads execute in the context of victim sessions, enabling session hijacking, credential theft, and administrative action forgery within the WordPress environment.

Affected Products

Media Library Assistant plugin for WordPress (all versions through 3.24)
WordPress sites with the plugin installed and active
Administrator and editor accounts interacting with attacker-controlled media content

Discovery Timeline

2025-03-31 - CVE-2025-31627 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-31627

Vulnerability Analysis

The Media Library Assistant plugin fails to sanitize and encode user-controlled input before rendering it in HTML output. An authenticated user with elevated permissions can submit crafted input containing JavaScript payloads. The plugin stores this input and later renders it without proper output encoding. When another user loads the affected page, the browser executes the injected script under the site's origin.

The attack requires network access and user interaction from the victim. The scope change indicates the injected script can access resources or data outside the vulnerable component's security boundary, such as cookies, DOM elements, or authenticated API endpoints across the WordPress admin interface.

Root Cause

The root cause is missing or insufficient output encoding when rendering user-supplied metadata or configuration values managed by the plugin. Input passes from storage to the DOM without invoking WordPress sanitization functions such as esc_html(), esc_attr(), or wp_kses(). This allows arbitrary HTML and JavaScript to persist and execute.

Attack Vector

An attacker with high-privilege authenticated access submits a payload through a plugin field that stores media library metadata or configuration. The payload persists in the WordPress database. When an administrator or another privileged user browses the affected view, the browser parses and executes the stored script. The attacker can then perform actions on behalf of the victim, exfiltrate session tokens, or pivot to further compromise.

No public proof-of-concept exploit is currently available. Technical details are documented in the Patchstack Vulnerability Report.

Detection Methods for CVE-2025-31627

Indicators of Compromise

Unexpected <script> tags, event handlers, or JavaScript URIs stored in WordPress wp_postmeta or plugin-specific tables
Outbound HTTP requests from administrator browsers to unfamiliar domains after visiting media library pages
New administrator accounts or role changes without corresponding audit trail entries
Modified plugin settings or media metadata containing HTML entities and encoded scripts

Detection Strategies

Audit database entries associated with the Media Library Assistant plugin for HTML tags and JavaScript patterns
Deploy Content Security Policy (CSP) headers in report-only mode to surface inline script violations
Review WordPress access logs for POST requests to plugin endpoints from privileged accounts
Correlate admin session activity with anomalous outbound network traffic from workstations

Monitoring Recommendations

Enable WordPress audit logging plugins to record metadata edits and plugin configuration changes
Monitor browser console errors and CSP violation reports from administrator sessions
Track file integrity of plugin directories and alert on unauthorized modifications
Establish baseline behavior for plugin-related database writes and alert on deviations

How to Mitigate CVE-2025-31627

Immediate Actions Required

Identify all WordPress installations running Media Library Assistant version 3.24 or earlier
Restrict access to high-privilege accounts and enforce multi-factor authentication for administrators
Review recent media library entries and plugin configuration for suspicious HTML or JavaScript content
Apply the vendor patch as soon as a fixed version becomes available

Patch Information

The vulnerability affects Media Library Assistant through version 3.24. Consult the Patchstack Vulnerability Report for the latest patched version and upgrade guidance. Update the plugin through the WordPress admin dashboard or via WP-CLI.

Workarounds

Deactivate the Media Library Assistant plugin until a patched version is installed
Limit plugin capabilities to a small set of trusted administrators through role restrictions
Deploy a Web Application Firewall (WAF) rule set that blocks XSS payloads in plugin request parameters
Enforce a strict Content Security Policy that disallows inline scripts and untrusted script sources

bash

# Update Media Library Assistant plugin via WP-CLI
wp plugin update media-library-assistant

# Verify installed version
wp plugin get media-library-assistant --field=version

# Deactivate the plugin as a temporary workaround
wp plugin deactivate media-library-assistant