CVE-2025-52771 Overview
CVE-2025-52771 is a stored Cross-Site Scripting (XSS) vulnerability in the bcupham Video Expander WordPress plugin. The flaw affects all versions of the video-expander plugin up to and including 1.0. Attackers with low-privilege authenticated access can inject persistent JavaScript payloads that execute in the browser of any user viewing the affected page. The vulnerability is classified under CWE-79, Improper Neutralization of Input During Web Page Generation.
Critical Impact
Authenticated attackers can store malicious scripts that execute in visitors' browsers, enabling session theft, credential harvesting, and unauthorized actions against WordPress site users.
Affected Products
- bcupham Video Expander plugin for WordPress
- All versions from initial release through version 1.0
- WordPress sites with the video-expander plugin installed and active
Discovery Timeline
- 2025-08-14 - CVE-2025-52771 published to the National Vulnerability Database (NVD)
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-52771
Vulnerability Analysis
The Video Expander plugin fails to properly neutralize user-supplied input before rendering it within generated web pages. When an authenticated user submits data through the plugin's input handlers, the payload is stored in the WordPress database without sufficient sanitization or output encoding. Subsequent page rendering reflects the stored input directly into the HTML document, allowing embedded <script> tags or event-handler attributes to execute in visitors' browsers.
The scope change indicated by the vulnerability means script execution crosses trust boundaries. A payload injected by a low-privileged contributor can affect administrators and site visitors alike. This aligns with typical stored XSS behavior in WordPress plugins that mishandle shortcode attributes, admin form fields, or plugin settings.
Root Cause
The root cause is missing or insufficient input sanitization combined with unsafe output rendering. WordPress provides functions such as sanitize_text_field(), wp_kses_post(), and esc_attr() to neutralize dangerous input, but the affected plugin code paths do not apply them consistently. Stored data is echoed into the DOM without contextual encoding.
Attack Vector
Exploitation requires network access to the WordPress site and low-privilege authenticated access. The attacker submits crafted input containing JavaScript through a plugin form, shortcode parameter, or admin interface. User interaction is required — a victim must load a page that renders the stored payload. Once triggered, the script executes in the victim's session context, enabling cookie theft, forced administrative actions via CSRF, or delivery of secondary payloads.
No verified proof-of-concept code has been published. See the Patchstack Vulnerability Report for the coordinated disclosure record.
Detection Methods for CVE-2025-52771
Indicators of Compromise
- Unexpected <script>, <iframe>, or on* event-handler attributes stored in plugin-managed post metadata or wp_options entries related to video-expander.
- Outbound HTTP requests from visitor browsers to unfamiliar domains after rendering pages containing the plugin's shortcode.
- Unauthorized administrative activity following contributor or author account logins.
Detection Strategies
- Scan the WordPress database for HTML control characters and script tags in fields populated by the Video Expander plugin.
- Review web server access logs for POST requests to plugin endpoints containing URL-encoded <script> or javascript: payloads.
- Enable a Content Security Policy (CSP) in report-only mode to surface inline script execution originating from plugin-rendered content.
Monitoring Recommendations
- Monitor WordPress user role assignments and administrative privilege changes for unauthorized escalation.
- Alert on modifications to plugin configuration tables and post metadata associated with video-expander.
- Track browser-side security violations reported via CSP endpoints to identify active exploitation attempts.
How to Mitigate CVE-2025-52771
Immediate Actions Required
- Deactivate and remove the Video Expander plugin from all WordPress installations until a patched release is available.
- Audit existing plugin data for injected scripts and purge malicious content from the database.
- Rotate credentials and invalidate active sessions for administrators who may have viewed compromised pages.
Patch Information
No vendor-supplied patch is currently documented for the Video Expander plugin. The vulnerability affects all versions through 1.0, and the plugin appears to be unmaintained. Site operators should treat removal as the primary remediation until an updated release is confirmed via the Patchstack advisory.
Workarounds
- Restrict contributor, author, and editor account creation to trusted users while the plugin remains installed.
- Deploy a web application firewall (WAF) rule to block requests containing script tags or JavaScript URI schemes targeting plugin endpoints.
- Enforce a strict Content Security Policy that disallows inline scripts and untrusted script sources.
- Replace Video Expander with a maintained alternative plugin that receives active security updates.
# Configuration example: remove the plugin via WP-CLI
wp plugin deactivate video-expander
wp plugin delete video-expander
# Verify removal
wp plugin list --status=active | grep -i video-expander
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.