CVE-2025-39417: WordPress Redirect Plugin CSRF Vulnerability

CVE-2025-39417 Overview

CVE-2025-39417 is a Cross-Site Request Forgery (CSRF) vulnerability in the "Redirect wordpress to welcome or landing page" WordPress plugin that can be chained with Stored Cross-Site Scripting (XSS). This vulnerability allows attackers to trick authenticated administrators into performing unintended actions, ultimately leading to persistent XSS payload injection within the WordPress administrative context.

Critical Impact

Attackers can exploit CSRF to inject malicious scripts that persist in the WordPress database, potentially compromising administrator sessions, stealing credentials, or performing unauthorized administrative actions.

Affected Products

• Redirect wordpress to welcome or landing page plugin version 2.0 and earlier
• WordPress installations running the vulnerable plugin versions

Discovery Timeline

• 2025-04-17 - CVE-2025-39417 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-39417

Vulnerability Analysis

This vulnerability combines two distinct attack vectors into a potent exploitation chain. The primary weakness lies in insufficient CSRF token validation within the plugin's settings update functionality. When an authenticated administrator visits a malicious page crafted by an attacker, the plugin fails to verify the legitimacy of the incoming request, allowing the attacker to modify plugin settings on behalf of the administrator.

The secondary component involves improper input sanitization of user-supplied data stored in the plugin's configuration. Because the plugin does not adequately sanitize or escape output, attackers can inject JavaScript code that executes whenever the stored content is rendered in the administrative interface. This combination of CSRF and Stored XSS significantly amplifies the potential damage, as the injected scripts persist and execute repeatedly for any administrator accessing the affected pages.

Root Cause

The root cause is classified under CWE-352 (Cross-Site Request Forgery). The plugin fails to implement proper CSRF protection mechanisms such as nonce verification for state-changing operations. WordPress provides built-in functions like wp_nonce_field() and wp_verify_nonce() specifically to prevent CSRF attacks, but the vulnerable plugin does not properly utilize these security controls. Additionally, the lack of output encoding when rendering stored configuration values enables the Stored XSS component of this vulnerability chain.

Attack Vector

The attack is executed over the network and requires user interaction. An attacker must craft a malicious webpage containing a hidden form that targets the vulnerable plugin's settings endpoint. When an authenticated WordPress administrator visits this attacker-controlled page (through phishing or other social engineering techniques), the form automatically submits, modifying the plugin settings to include malicious JavaScript.

The attacker's payload typically includes JavaScript that steals session cookies, creates backdoor administrator accounts, modifies site content, or redirects users to malicious sites. Because the XSS payload is stored in the database, it executes every time an administrator accesses the plugin settings page, creating a persistent compromise vector.

Since no verified proof-of-concept code is available, the vulnerability mechanism can be understood through the Patchstack Vulnerability Advisory which provides technical details on the exploitation methodology.

Detection Methods for CVE-2025-39417

Indicators of Compromise

• Unexpected modifications to the "Redirect wordpress to welcome or landing page" plugin settings
• Presence of JavaScript code or HTML tags within plugin configuration fields
• Unauthorized administrator accounts created on the WordPress site
• Unusual outbound network requests from the administrative interface
• Browser console errors indicating script execution from unknown origins

Detection Strategies

• Review WordPress plugin settings for unexpected or suspicious content containing <script> tags or JavaScript event handlers
• Monitor HTTP POST requests to the plugin's settings update endpoint for requests originating from external referrers
• Implement Content Security Policy (CSP) headers to detect and block inline script execution attempts
• Audit WordPress user account creation logs for unauthorized administrator accounts

Monitoring Recommendations

• Enable WordPress debug logging to capture unusual plugin activity
• Deploy Web Application Firewall (WAF) rules to detect CSRF attack patterns targeting WordPress administrative endpoints
• Configure alerts for changes to plugin settings outside of normal administrative workflows
• Monitor for requests to the WordPress admin area with external HTTP referrer headers

How to Mitigate CVE-2025-39417

Immediate Actions Required

• Deactivate and remove the "Redirect wordpress to welcome or landing page" plugin until a patched version is available
• Audit existing plugin settings for any injected malicious content and sanitize as needed
• Review WordPress user accounts and remove any unauthorized administrator accounts
• Invalidate all active administrator sessions to terminate any potentially compromised sessions
• Implement SentinelOne Singularity XDR for real-time detection of web application attacks and exploitation attempts

Patch Information

At the time of publication, no official patch has been released by the plugin developer. Organizations should monitor the Patchstack Vulnerability Advisory for updates regarding a security fix. Until a patch is available, removing the plugin is the recommended mitigation approach.

Workarounds

• Remove the vulnerable plugin entirely from WordPress installations
• If the plugin functionality is required, implement a Web Application Firewall (WAF) with rules to block CSRF attacks and XSS payloads
• Restrict administrative access to trusted IP addresses only using .htaccess or security plugins
• Educate administrators about phishing attacks and the risks of clicking links while logged into WordPress

# WordPress CLI command to deactivate the vulnerable plugin
wp plugin deactivate redirect-to-welcome-or-landing-page --path=/var/www/html/wordpress

# Remove the plugin entirely
wp plugin delete redirect-to-welcome-or-landing-page --path=/var/www/html/wordpress

# List all administrator accounts for audit
wp user list --role=administrator --path=/var/www/html/wordpress