CVE-2025-48153: Import CDN-Remote Images CSRF Vulnerability

CVE-2025-48153 Overview

CVE-2025-48153 is a Cross-Site Request Forgery (CSRF) vulnerability in the Import CDN-Remote Images WordPress plugin developed by Atakan Au. This vulnerability allows attackers to exploit the lack of proper CSRF token validation to inject malicious scripts that are stored persistently, resulting in Stored Cross-Site Scripting (XSS) attacks against site administrators and users.

Critical Impact

Attackers can chain CSRF with Stored XSS to execute arbitrary JavaScript in the context of authenticated users, potentially leading to session hijacking, administrative account compromise, or full site takeover.

Affected Products

• Import CDN-Remote Images WordPress plugin versions up to and including 2.1.2
• WordPress installations utilizing the import-cdn-remote-images plugin

Discovery Timeline

• 2025-07-16 - CVE-2025-48153 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-48153

Vulnerability Analysis

This vulnerability represents a dangerous combination of two distinct web application security flaws: Cross-Site Request Forgery (CSRF) and Stored Cross-Site Scripting (XSS). The Import CDN-Remote Images plugin fails to implement proper CSRF protection mechanisms, allowing attackers to craft malicious requests that execute actions on behalf of authenticated administrators without their knowledge.

When an authenticated administrator visits a malicious page or clicks a specially crafted link, the attacker can trigger plugin functionality that stores user-controlled data without proper sanitization. This stored payload is then rendered without adequate output encoding, resulting in persistent script execution whenever the affected page is viewed.

The chained nature of this vulnerability significantly amplifies its impact. While a standalone CSRF vulnerability might be limited to performing unwanted actions, combining it with Stored XSS enables persistent compromise of any user who subsequently views the affected content.

Root Cause

The vulnerability stems from two primary implementation failures in the Import CDN-Remote Images plugin:

1. Missing CSRF Token Validation: The plugin does not verify WordPress nonces or implement equivalent anti-CSRF mechanisms for state-changing operations, allowing cross-origin requests to be processed as legitimate.

2. Insufficient Input Sanitization and Output Encoding: User-supplied data is stored and rendered without proper sanitization using functions like sanitize_text_field() or proper escaping with esc_html() or esc_attr() during output.

Attack Vector

The attack requires user interaction where an authenticated WordPress administrator must be tricked into visiting an attacker-controlled website or clicking a malicious link. The attacker's page contains a hidden form or JavaScript that automatically submits a request to the vulnerable WordPress plugin endpoint.

The malicious request contains XSS payloads that are stored in the WordPress database. Once stored, these payloads execute in the browser of any user who views the affected content, including administrators with elevated privileges.

The attack flow typically involves:

1. Attacker crafts a malicious HTML page containing auto-submitting forms targeting the vulnerable plugin endpoint
2. Administrator is lured to visit the attacker's page while authenticated to WordPress
3. The CSRF request is submitted, storing malicious JavaScript in the database
4. When any user views the affected area, the stored XSS payload executes

Detection Methods for CVE-2025-48153

Indicators of Compromise

• Unexpected or unfamiliar entries in plugin-related database tables containing HTML or JavaScript code
• Browser console errors or unexpected script execution when accessing WordPress admin pages
• Suspicious outbound network connections from user browsers when viewing WordPress content
• Unusual plugin configuration changes that administrators do not recall making

Detection Strategies

• Monitor WordPress database tables associated with the Import CDN-Remote Images plugin for entries containing <script>, javascript:, onerror=, or similar XSS indicators
• Implement Web Application Firewall (WAF) rules to detect and block requests containing XSS payloads targeting known vulnerable endpoints
• Review server access logs for POST requests to plugin endpoints originating from external referrers
• Deploy Content Security Policy (CSP) headers to detect and report unauthorized script execution

Monitoring Recommendations

• Enable WordPress audit logging to track all plugin configuration changes and administrative actions
• Configure browser-based security monitoring to detect anomalous JavaScript execution patterns
• Implement real-time alerting for database modifications to plugin-specific tables
• Monitor for external domain references in stored content that could indicate XSS payload injection

How to Mitigate CVE-2025-48153

Immediate Actions Required

• Update the Import CDN-Remote Images plugin to a patched version if available from the vendor
• If no patch is available, deactivate and remove the import-cdn-remote-images plugin immediately
• Audit the WordPress database for any potentially injected malicious content
• Review user accounts for unauthorized privilege escalations or suspicious activity
• Clear browser caches and invalidate all active sessions for WordPress administrators

Patch Information

Security researchers at Patchstack have documented this vulnerability. For the latest patch status and remediation guidance, refer to the Patchstack Vulnerability Report.

Organizations should monitor for vendor updates to version 2.1.3 or later that address both the CSRF and Stored XSS components of this vulnerability.

Workarounds

• Disable or uninstall the Import CDN-Remote Images plugin until an official patch is released
• Implement a Web Application Firewall with rules to block CSRF and XSS attack patterns targeting WordPress plugins
• Restrict access to WordPress administrative areas using IP allowlisting or VPN requirements
• Deploy Content Security Policy headers to mitigate the impact of XSS payloads by restricting script sources
• Educate administrators about the risks of clicking links or visiting untrusted sites while authenticated to WordPress

# WordPress security hardening configuration
# Add to wp-config.php to enhance security posture

# Force SSL for admin area
define('FORCE_SSL_ADMIN', true);

# Disable plugin and theme file editing
define('DISALLOW_FILE_EDIT', true);

# Limit login attempts (requires additional plugin or custom implementation)
# Consider implementing IP-based access restrictions for wp-admin