CVE-2025-39455: IP2Location Variables CSRF Vulnerability

CVE-2025-39455 Overview

CVE-2025-39455 is a Cross-Site Request Forgery (CSRF) vulnerability [CWE-352] in the IP2Location Variables plugin for WordPress. The flaw chains CSRF with reflected Cross-Site Scripting (XSS), enabling attackers to execute arbitrary JavaScript in an authenticated user's browser. The vulnerability affects all versions of ip2location-variables up to and including 2.9.5. Exploitation requires a logged-in WordPress user to click a crafted link or visit a malicious page. Successful attacks can lead to session theft, administrative action abuse, and content injection within the WordPress admin context.

Critical Impact

Attackers can hijack authenticated WordPress sessions and execute arbitrary JavaScript by tricking logged-in users into visiting a malicious URL.

Affected Products

• IP2Location Variables WordPress plugin (ip2location-variables)
• All versions from n/a through 2.9.5
• WordPress installations using the vulnerable plugin

Discovery Timeline

• 2025-04-17 - CVE-2025-39455 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-39455

Vulnerability Analysis

The vulnerability combines two weaknesses into a single exploit chain. The plugin lacks proper CSRF protection on a state-changing or rendering endpoint, and the same endpoint reflects user-controlled input back into the response without adequate sanitization or output encoding. An attacker hosts a page or sends a link that triggers a request to the vulnerable endpoint while the victim holds an active WordPress session.

Because the request originates from the victim's browser, it carries the victim's authentication cookies. The reflected input contains attacker-controlled JavaScript that executes in the WordPress origin. This grants the attacker the same privileges as the targeted user, including administrative actions if an administrator is targeted.

The attack requires user interaction, which limits opportunistic exploitation but remains effective against targeted phishing campaigns. The scope change indicated by the CVSS vector reflects the cross-origin nature of the payload delivery and the impact on the WordPress trust boundary.

Root Cause

The plugin fails to validate WordPress nonces (wp_nonce) on requests reaching the vulnerable handler. It also fails to apply contextual output escaping using functions such as esc_html(), esc_attr(), or wp_kses() before reflecting request parameters into rendered HTML. The combination of missing CSRF tokens and missing output encoding turns a benign reflection into a stored-impact XSS via forced browsing.

Attack Vector

The attacker crafts a URL targeting the vulnerable plugin endpoint with a malicious payload embedded in a request parameter. The attacker delivers the URL through phishing, malicious advertising, or an attacker-controlled site that auto-submits a form. When a logged-in WordPress user follows the link, the browser submits the request with valid session cookies. The server processes the request and reflects the payload, which the victim's browser executes within the WordPress origin.

No verified proof-of-concept code is publicly available. Refer to the Patchstack Vulnerability Report for additional technical details.

Detection Methods for CVE-2025-39455

Indicators of Compromise

• Unexpected outbound HTTP requests from WordPress administrator browsers to unknown external domains immediately after visiting plugin pages
• New or modified WordPress administrator accounts without a corresponding audit trail
• Suspicious entries in web server access logs containing script tags, javascript: URIs, or HTML entities in query parameters for ip2location-variables endpoints
• Referer headers pointing to external attacker-controlled domains preceding requests to the plugin

Detection Strategies

• Monitor WordPress access logs for requests to plugin endpoints containing encoded <script> tags, onerror=, or onload= payloads in query strings
• Deploy a Web Application Firewall (WAF) with rules that block reflected XSS payloads and enforce same-origin Referer validation for state-changing requests
• Inspect HTTP request bodies and parameters for known XSS signatures targeting the ip2location-variables plugin path

Monitoring Recommendations

• Enable verbose WordPress audit logging to capture user actions, plugin requests, and administrative changes
• Forward web server and WordPress logs to a centralized analytics platform for correlation and anomaly detection
• Track plugin inventory and version data across WordPress fleets to identify hosts running ip2location-variables 2.9.5 or earlier

How to Mitigate CVE-2025-39455

Immediate Actions Required

• Update the IP2Location Variables plugin to a version newer than 2.9.5 once a patched release becomes available
• Deactivate and remove the plugin from production WordPress sites if a patch is not yet available
• Audit WordPress administrator accounts and active sessions for unauthorized changes
• Force password resets for privileged WordPress users who may have visited untrusted links

Patch Information

Review the Patchstack Vulnerability Report for vendor patch status and remediation guidance. Apply the vendor-supplied update as soon as it is published.

Workarounds

• Restrict access to the WordPress admin interface using IP allowlists or VPN-only access
• Enforce a strict Content Security Policy (CSP) that disallows inline scripts and limits script sources to trusted origins
• Configure WAF rules to block requests to ip2location-variables endpoints containing HTML or script payloads in parameters
• Train administrators to avoid clicking untrusted links while logged into WordPress

# Example WAF rule to block reflected XSS payloads targeting the plugin
# ModSecurity rule
SecRule REQUEST_URI "@contains ip2location-variables" \
    "chain,id:1003955,phase:2,deny,status:403,msg:'Block CVE-2025-39455 XSS attempt'"
    SecRule ARGS "@rx (?i)(<script|javascript:|onerror=|onload=)" "t:none,t:urlDecodeUni"