CVE-2026-1320 in Secure Copy Content Protection and Content Locking Plugin
Summary
by MITRE • 02/12/2026
The Secure Copy Content Protection and Content Locking plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'X-Forwarded-For' HTTP header in all versions up to, and including, 4.9.8 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
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Analysis
by VulDB Data Team • 02/13/2026
The Secure Copy Content Protection and Content Locking plugin for WordPress represents a critical security vulnerability classified as CVE-2026-1320, affecting all versions up to and including 4.9.8. This vulnerability stems from inadequate input sanitization and output escaping mechanisms within the plugin's handling of HTTP headers, specifically the X-Forwarded-For header that is commonly used in web server configurations to identify the original IP address of a client connecting through a proxy or load balancer. The flaw creates a persistent cross-site scripting vector that allows attackers to inject malicious scripts into the application's response handling, enabling them to execute arbitrary code within the context of any user's browser session. The vulnerability's classification aligns with CWE-79, which addresses cross-site scripting flaws, and demonstrates how improper handling of untrusted input data can lead to severe security implications in web applications.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious X-Forwarded-For header containing script payloads and submits it to a vulnerable WordPress installation. The plugin fails to properly sanitize this input before incorporating it into the application's output, creating a stored XSS condition where the malicious code persists within the application's data storage. When administrators or other authenticated users access pages that display this tainted data, the injected scripts execute in their browsers, potentially leading to session hijacking, credential theft, or further exploitation of the compromised user's privileges. This attack vector operates without requiring authentication, making it particularly dangerous as it can be exploited by anyone with access to the vulnerable WordPress site. The vulnerability's impact extends beyond simple script execution, as it can enable attackers to establish persistent access through techniques such as cookie stealing or redirecting users to malicious sites.
The operational impact of this vulnerability creates significant risks for WordPress administrators and end users alike, as it provides attackers with a method to compromise user sessions and potentially gain unauthorized access to sensitive content protection features. The stored nature of the vulnerability means that once exploited, malicious scripts remain embedded within the application until manually removed or the plugin is updated, creating a persistent threat that can affect multiple users over time. Security practitioners must consider this vulnerability in the context of the ATT&CK framework's T1566 technique, which covers social engineering through malicious content, and the T1071.004 sub-technique related to application layer protocol traffic. The vulnerability also demonstrates the importance of proper input validation and output encoding practices, as outlined in OWASP's top ten security risks, where inadequate sanitization of user inputs leads to various injection attacks. Organizations running affected versions of the plugin face potential data breaches, unauthorized content modification, and loss of user trust, particularly since the plugin's purpose is to provide content protection and locking functionality.
Mitigation strategies for CVE-2026-1320 require immediate action from WordPress administrators to update to the latest available version of the Secure Copy Content Protection and Content Locking plugin, which should contain proper input sanitization and output escaping mechanisms. Security teams should implement network-level protections such as web application firewalls that can detect and block malicious X-Forwarded-For headers containing script payloads, while also monitoring for unusual traffic patterns that might indicate exploitation attempts. Additionally, administrators should consider implementing Content Security Policy headers to limit the execution of inline scripts and restrict the sources from which scripts can be loaded, providing an additional layer of defense against XSS attacks. Regular security audits and penetration testing should include verification of input handling within all installed plugins, particularly those that process HTTP headers or user-provided data. The vulnerability highlights the critical importance of maintaining up-to-date software components and implementing proper security controls around HTTP header processing, as outlined in industry best practices for WordPress security hardening and secure coding standards.