CVE-2025-23870: Copyright Safeguard CSRF Vulnerability

CVE-2025-23870 Overview

CVE-2025-23870 is a Cross-Site Request Forgery (CSRF) vulnerability in the WordPress plugin "Copyright Safeguard Footer Notice" developed by wygk. This vulnerability allows attackers to chain CSRF with Stored Cross-Site Scripting (XSS), potentially leading to persistent malicious script injection within affected WordPress installations.

The vulnerability exists in all versions of the Copyright Safeguard Footer Notice plugin through version 3.0. An attacker can craft a malicious request that, when executed by an authenticated administrator, injects persistent JavaScript code into the footer notice settings. This stored XSS payload would then execute in the browsers of all site visitors, creating a significant security risk.

Critical Impact

Attackers can leverage CSRF to inject persistent malicious scripts that execute in the context of every visitor's browser session, potentially leading to credential theft, session hijacking, or malware distribution.

Affected Products

• Copyright Safeguard Footer Notice WordPress Plugin versions through 3.0
• WordPress installations running vulnerable plugin versions
• All site visitors exposed to injected XSS payloads

Discovery Timeline

• 2025-01-16 - CVE-2025-23870 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-23870

Vulnerability Analysis

This vulnerability represents a chained attack scenario combining two distinct web application security flaws. The plugin fails to implement proper anti-CSRF token validation on its administrative settings forms, allowing attackers to forge requests that modify plugin 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 HTML page containing a hidden form that submits to the plugin's settings endpoint. When an authenticated WordPress administrator visits this malicious page, the form automatically submits, injecting attacker-controlled JavaScript into the footer notice content. Since the plugin does not properly sanitize or encode the stored content before rendering it on the frontend, the malicious script executes for every subsequent visitor.

Root Cause

The root cause of this vulnerability is twofold:

1. Missing CSRF Protection: The plugin's settings update functionality does not verify WordPress nonce tokens, allowing cross-origin requests to modify plugin settings without proper authorization validation.

2. Insufficient Output Encoding: User-supplied input stored in the footer notice field is not properly sanitized or escaped before being rendered in the HTML output, enabling the execution of injected JavaScript code.

Attack Vector

The attack requires social engineering to lure a WordPress administrator to a malicious webpage. The attacker's page contains an auto-submitting form targeting the plugin's settings endpoint. Once the administrator's browser submits this forged request, the malicious payload is stored in the database and served to all site visitors.

The exploitation does not require authentication from the attacker's perspective—they only need to trick an already-authenticated administrator into visiting their crafted page. The stored nature of the XSS means the payload persists and affects all subsequent visitors until manually removed.

Detection Methods for CVE-2025-23870

Indicators of Compromise

• Unexpected JavaScript code present in the Copyright Safeguard Footer Notice plugin settings
• Suspicious <script> tags or event handlers (e.g., onerror, onload) in footer content
• Database entries in WordPress options table containing encoded or obfuscated JavaScript
• User reports of browser warnings or unexpected redirects when visiting the site

Detection Strategies

• Review WordPress options table for entries related to the Copyright Safeguard Footer Notice plugin containing script tags or JavaScript event handlers
• Monitor web server access logs for POST requests to plugin settings endpoints from external referrers
• Implement Content Security Policy (CSP) headers to detect and block unauthorized inline script execution
• Use WordPress security plugins that scan for known malicious patterns in stored content

Monitoring Recommendations

• Enable WordPress audit logging to track changes to plugin settings and identify unauthorized modifications
• Configure web application firewall (WAF) rules to alert on XSS patterns in POST request bodies targeting WordPress admin endpoints
• Regularly audit the footer notice content through the WordPress admin panel for unexpected modifications
• Monitor for unusual traffic patterns that may indicate CSRF attacks, such as settings changes originating from external referrers

How to Mitigate CVE-2025-23870

Immediate Actions Required

• Disable or remove the Copyright Safeguard Footer Notice plugin until a patched version is available
• Review current footer notice content for any injected malicious scripts and remove them
• Consider implementing additional CSRF protection at the server or WAF level
• Audit user accounts for any signs of compromise resulting from potential XSS exploitation

Patch Information

As of the published CVE data, versions through 3.0 are affected. Site administrators should check the Patchstack Vulnerability Report for the latest information on patches and updates from the plugin developer.

Workarounds

• Temporarily deactivate the Copyright Safeguard Footer Notice plugin until a security patch is released
• Implement strict Content Security Policy headers to mitigate the impact of stored XSS by blocking inline script execution
• Use a Web Application Firewall (WAF) with rules to block CSRF attempts targeting WordPress plugin settings
• Restrict administrator access to trusted networks and implement additional authentication controls to reduce CSRF attack surface