CVE-2025-48359: ATT YouTube Widget CSRF Vulnerability

CVE-2025-48359 Overview

CVE-2025-48359 is a Cross-Site Request Forgery (CSRF) vulnerability in the ATT YouTube Widget WordPress plugin (developed by thaihavnn07) that enables attackers to inject persistent malicious scripts through Stored Cross-Site Scripting (XSS). This chained vulnerability allows an attacker to trick an authenticated administrator into performing unintended actions, ultimately resulting in the injection of JavaScript code that executes whenever users view affected pages.

Critical Impact

Attackers can chain CSRF with Stored XSS to achieve persistent script injection, potentially compromising administrator sessions, defacing websites, or redirecting visitors to malicious sites.

Affected Products

• ATT YouTube Widget WordPress plugin version 1.0 and earlier
• WordPress sites using the att-youtube plugin

Discovery Timeline

• 2025-08-28 - CVE-2025-48359 published to NVD
• 2026-04-01 - Last updated in NVD database

Technical Details for CVE-2025-48359

Vulnerability Analysis

This vulnerability represents a dangerous combination of two web application security flaws. The ATT YouTube Widget plugin fails to implement proper CSRF token validation on forms that accept user input for widget configuration. Combined with insufficient output encoding, this creates a pathway for Stored XSS attacks.

The attack chain works as follows: An attacker crafts a malicious web page containing a hidden form that submits widget settings to the vulnerable WordPress plugin. When an authenticated administrator visits the attacker's page, the form automatically submits, modifying the widget's configuration to include malicious JavaScript. Since the plugin also lacks proper output sanitization, the injected script is stored in the database and rendered whenever the widget is displayed.

Root Cause

The root cause is twofold. First, the plugin does not verify CSRF tokens (WordPress nonces) when processing form submissions for widget settings, violating CWE-352 (Cross-Site Request Forgery). Second, user-supplied input is stored and later rendered without proper HTML entity encoding, enabling the Stored XSS component of the attack.

Attack Vector

The attack requires social engineering to lure an authenticated WordPress administrator to a malicious page. The attacker hosts a crafted HTML page containing an auto-submitting form that targets the vulnerable plugin endpoint. The form includes malicious JavaScript payloads in input fields that the plugin saves without validation.

Once the administrator unknowingly visits the attacker's page while logged into their WordPress site, the browser automatically sends the forged request with the admin's session cookies. The plugin processes the request as legitimate, storing the malicious script in the widget configuration. From that point forward, any visitor viewing pages with the compromised widget will have the malicious JavaScript executed in their browser context.

Detection Methods for CVE-2025-48359

Indicators of Compromise

• Unexpected JavaScript code in ATT YouTube Widget configuration settings
• Widget settings containing <script> tags or event handlers like onerror, onload
• Suspicious HTTP POST requests to widget settings endpoints without proper referrer headers
• User reports of unexpected browser behavior or redirects on pages containing the widget

Detection Strategies

• Review WordPress database for the att-youtube widget options containing HTML or JavaScript content
• Monitor web server logs for POST requests to plugin settings endpoints with external referrers
• Implement Content Security Policy (CSP) headers to detect and block inline script execution
• Use WordPress security plugins to scan for stored XSS patterns in plugin configuration data

Monitoring Recommendations

• Enable WordPress audit logging to track widget configuration changes
• Configure web application firewall (WAF) rules to detect CSRF attack patterns
• Monitor for unusual administrator activity following visits to external sites
• Implement browser-side XSS detection through CSP violation reporting

How to Mitigate CVE-2025-48359

Immediate Actions Required

• Deactivate and remove the ATT YouTube Widget (att-youtube) plugin from all WordPress installations
• Audit current widget configurations for any injected malicious code
• Review WordPress user accounts for any unauthorized changes made during potential compromise
• Implement a Web Application Firewall (WAF) with CSRF and XSS protection rules

Patch Information

No official patch has been released for this vulnerability. The affected plugin version 1.0 and all prior versions remain vulnerable. Organizations should consider replacing this plugin with a maintained alternative that implements proper security controls.

For additional technical details, refer to the Patchstack Vulnerability Report.

Workarounds

• Remove the ATT YouTube Widget plugin entirely until a patched version is available
• If removal is not immediately possible, restrict administrative access to trusted networks only
• Implement Content Security Policy headers to mitigate the impact of any stored XSS payloads
• Use WordPress security plugins that add CSRF protection layers to plugin forms
• Train administrators to avoid clicking links or visiting untrusted sites while logged into WordPress

# WordPress plugin removal via WP-CLI
wp plugin deactivate att-youtube --allow-root
wp plugin delete att-youtube --allow-root

# Verify removal
wp plugin list --status=active | grep att-youtube