CVE-2025-31382: Language Field CSRF Vulnerability

CVE-2025-31382 Overview

CVE-2025-31382 is a Cross-Site Request Forgery (CSRF) vulnerability affecting the Language Field WordPress plugin by theode. This vulnerability allows attackers to chain CSRF with Stored Cross-Site Scripting (XSS), potentially enabling malicious actors to execute arbitrary JavaScript code in the context of authenticated users who visit affected pages.

Critical Impact

Attackers can exploit this CSRF vulnerability to inject persistent malicious scripts that execute whenever users view affected content, potentially leading to session hijacking, credential theft, and further compromise of the WordPress installation.

Affected Products

• Language Field WordPress plugin versions through 0.9
• WordPress installations using the vulnerable plugin versions

Discovery Timeline

• 2025-04-09 - CVE-2025-31382 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-31382

Vulnerability Analysis

This vulnerability combines two distinct attack vectors: Cross-Site Request Forgery (CSRF) and Stored Cross-Site Scripting (XSS). The Language Field plugin fails to implement proper CSRF token validation on sensitive operations, allowing attackers to craft malicious requests that authenticated administrators might unknowingly execute. When combined with insufficient input sanitization, this enables the injection of persistent JavaScript payloads into the WordPress database.

The attack requires user interaction—specifically, an authenticated administrator must be tricked into visiting an attacker-controlled page or clicking a malicious link while logged into their WordPress dashboard. Once the CSRF attack succeeds, the injected XSS payload persists in the database and executes whenever the affected content is rendered.

Root Cause

The root cause is the absence of CSRF protection mechanisms (such as nonce verification) on administrative actions within the Language Field plugin. WordPress provides built-in nonce functions (wp_nonce_field(), wp_verify_nonce()) for CSRF protection, but these were not properly implemented. Additionally, user-supplied input is not adequately sanitized or escaped before being stored, enabling the Stored XSS component of the attack chain.

Attack Vector

The attack is network-based and requires user interaction. An attacker crafts a malicious HTML page containing a hidden form that submits data to the vulnerable WordPress plugin endpoint. When an authenticated administrator visits this page (often through social engineering or embedded in seemingly legitimate content), the form automatically submits, bypassing authentication because the victim's browser includes their session cookies.

The submitted payload contains malicious JavaScript that gets stored in the WordPress database. Subsequently, when any user (including administrators) views pages that render this stored data, the malicious script executes in their browser context, potentially stealing session tokens, performing actions on behalf of the user, or redirecting to phishing sites.

Detection Methods for CVE-2025-31382

Indicators of Compromise

• Unexpected or suspicious JavaScript code in WordPress database fields related to language settings
• Unusual administrative actions in WordPress audit logs that the administrator did not perform
• Reports of browser-based attacks or redirects from users viewing affected pages
• Presence of obfuscated or encoded script tags in language field configuration data

Detection Strategies

• Enable and review WordPress audit logs for unauthorized configuration changes to the Language Field plugin
• Implement Content Security Policy (CSP) headers to detect and block unauthorized script execution
• Deploy web application firewalls (WAF) with rules to detect CSRF and XSS attack patterns
• Regularly scan the WordPress database for suspicious script tags or JavaScript code in unexpected fields

Monitoring Recommendations

• Monitor HTTP POST requests to Language Field plugin endpoints from external referrers
• Set up alerts for changes to plugin configuration outside of normal administrative workflows
• Review browser console errors and CSP violation reports for signs of blocked malicious scripts
• Implement real-time monitoring of WordPress database modifications to sensitive configuration tables

How to Mitigate CVE-2025-31382

Immediate Actions Required

• Update the Language Field plugin to a patched version if available from the vendor
• If no patch is available, consider disabling or removing the Language Field plugin until a fix is released
• Review WordPress database for any signs of injected malicious content and sanitize affected records
• Implement web application firewall rules to block CSRF and XSS attack patterns targeting the plugin

Patch Information

At the time of publication, users should check the Patchstack WordPress Plugin Vulnerability database for the latest patch status and remediation guidance. Monitor the plugin's official repository for security updates addressing this vulnerability.

Workarounds

• Disable the Language Field plugin until an official patch is available
• Implement strict Content Security Policy headers to mitigate XSS impact: Content-Security-Policy: script-src 'self';
• Restrict administrative access to trusted IP addresses to reduce CSRF attack surface
• Use security plugins that provide additional CSRF protection and input validation for WordPress

# Add CSP headers to WordPress .htaccess for XSS mitigation
<IfModule mod_headers.c>
    Header set Content-Security-Policy "script-src 'self'; object-src 'none';"
    Header set X-Content-Type-Options "nosniff"
    Header set X-XSS-Protection "1; mode=block"
</IfModule>