CVE-2025-31458: Video Embedder CSRF Vulnerability

CVE-2025-31458 Overview

CVE-2025-31458 is a Cross-Site Request Forgery (CSRF) vulnerability in the WordPress Video Embedder plugin developed by forsgren. This vulnerability allows attackers to chain CSRF with Stored Cross-Site Scripting (XSS), enabling malicious actors to inject persistent scripts into affected WordPress sites by tricking authenticated administrators into performing unintended actions.

Critical Impact

Attackers can exploit this CSRF-to-Stored-XSS chain to execute arbitrary JavaScript in the browsers of site visitors and administrators, potentially leading to session hijacking, credential theft, website defacement, or malware distribution.

Affected Products

• Video Embedder WordPress Plugin version 1.7.1 and earlier
• WordPress sites using vulnerable versions of the Video Embedder plugin

Discovery Timeline

• 2025-03-28 - CVE-2025-31458 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-31458

Vulnerability Analysis

This vulnerability represents a compound attack where CSRF serves as the entry point to achieve Stored XSS. The Video Embedder plugin fails to implement proper CSRF protection (nonce verification) on form submissions that handle video embedding configurations. When combined with insufficient input sanitization, this allows attackers to inject malicious scripts that persist in the WordPress database.

The attack requires social engineering to trick an authenticated administrator into visiting a malicious page or clicking a crafted link. Once the CSRF payload executes, the injected XSS payload is stored server-side and will execute whenever users access the affected pages.

Root Cause

The root cause is twofold: First, the plugin does not verify WordPress nonces on critical form submissions, violating the security principle of CSRF protection. Second, the plugin fails to properly sanitize and escape user-supplied input before storing it in the database and rendering it in the browser, enabling the Stored XSS component of the attack.

Attack Vector

The attack vector involves crafting a malicious HTML page containing a hidden form that submits data to the vulnerable Video Embedder plugin endpoint. When an authenticated WordPress administrator visits this malicious page, the form automatically submits, injecting the attacker's XSS payload into the plugin's stored settings.

The vulnerability manifests in the plugin's handling of video embedding parameters. Attackers can embed malicious JavaScript within video configuration fields that are then rendered without proper escaping. For detailed technical analysis, refer to the Patchstack WordPress Vulnerability Report.

Detection Methods for CVE-2025-31458

Indicators of Compromise

• Unexpected JavaScript code in Video Embedder plugin settings or database entries
• Unusual iframe or script tags within video embedding fields
• Evidence of form submissions from external referrers in web server logs targeting Video Embedder endpoints

Detection Strategies

• Monitor WordPress admin activity logs for configuration changes to the Video Embedder plugin that were not initiated by legitimate administrators
• Implement Content Security Policy (CSP) headers to detect and prevent unauthorized script execution
• Regularly audit stored plugin configurations and database entries for suspicious HTML or JavaScript content

Monitoring Recommendations

• Enable and review WordPress audit logging for plugin setting modifications
• Deploy Web Application Firewall (WAF) rules to detect CSRF attack patterns and XSS payloads in form submissions
• Configure alerts for administrative actions performed from unusual IP addresses or referrer domains

How to Mitigate CVE-2025-31458

Immediate Actions Required

• Update the Video Embedder plugin to a patched version when available from the vendor
• If no patch is available, consider temporarily deactivating the Video Embedder plugin until a fix is released
• Review and audit existing Video Embedder plugin settings for any injected malicious content
• Educate WordPress administrators about the risks of clicking untrusted links while logged into the admin panel

Patch Information

As of the published date, users should check the Patchstack WordPress Vulnerability Report for the latest patch status and version information. Update to a version greater than 1.7.1 when a security patch becomes available.

Workarounds

• Restrict WordPress admin panel access to trusted IP addresses using .htaccess or firewall rules
• Implement a Web Application Firewall (WAF) with CSRF and XSS protection rules
• Use browser extensions or policies that prevent automatic form submissions from untrusted origins
• Ensure administrators log out of WordPress admin sessions before browsing external websites

# Restrict WordPress admin access by IP in .htaccess
<Files wp-login.php>
    Order Deny,Allow
    Deny from all
    Allow from 192.168.1.0/24
</Files>

<Directory /var/www/html/wp-admin>
    Order Deny,Allow
    Deny from all
    Allow from 192.168.1.0/24
</Directory>