CVE-2025-30826: IP Locator DOM-Based XSS Vulnerability

CVE-2025-30826 Overview

CVE-2025-30826 is a DOM-based Cross-Site Scripting (XSS) vulnerability in the Pierre Lannoy IP Locator WordPress plugin. The flaw stems from improper neutralization of input during web page generation [CWE-79]. All versions of IP Locator up to and including 4.1.0 are affected. An attacker with low privileges can inject malicious script content that executes in a victim's browser after user interaction. Successful exploitation impacts confidentiality, integrity, and availability at limited scope, and can cross security boundaries because the vulnerability changes scope during exploitation.

Critical Impact
Attackers can execute arbitrary JavaScript in the context of a WordPress site visitor, enabling session theft, defacement, and forced actions on behalf of the victim.

Affected Products

Pierre Lannoy IP Locator WordPress plugin, all versions through 4.1.0
WordPress installations with the ip-locator plugin enabled
Any site relying on unpatched IP Locator releases prior to a fixed version

Discovery Timeline

2025-03-27 - CVE-2025-30826 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-30826

Vulnerability Analysis

The vulnerability is a DOM-based XSS issue in the IP Locator plugin's client-side handling of user-controllable input. The plugin writes untrusted data into the Document Object Model (DOM) without proper output encoding or sanitization. When a victim visits a crafted URL or interacts with a manipulated element, the browser parses attacker-supplied content as executable JavaScript. Because the injection occurs entirely in the browser, server-side WAF (Web Application Firewall) rules that inspect request bodies may not observe the malicious payload in the response.

Exploitation requires user interaction, and the attacker must hold at least low-level authenticated privileges on the WordPress site. The scope change indicates that the executed script can affect resources beyond the vulnerable component, such as cookies or tokens belonging to other users of the site.

Root Cause

The root cause is missing or insufficient sanitization of input rendered into the DOM by the plugin's front-end code. The plugin trusts data that flows from URL fragments, query parameters, or other client-controllable sources and reflects it into HTML sinks without escaping. This pattern maps directly to CWE-79, Improper Neutralization of Input During Web Page Generation.

Attack Vector

An attacker crafts a URL or content payload that embeds JavaScript targeting a DOM sink exposed by the plugin. The attacker then lures an authenticated WordPress user, typically through phishing or a malicious link, to trigger the payload. Upon rendering, the browser executes the attacker's script in the origin of the WordPress site. See the Patchstack Vulnerability Report for advisory details.

Detection Methods for CVE-2025-30826

Indicators of Compromise

Unexpected <script> tags, javascript: URIs, or event handler attributes appearing in pages rendered by the ip-locator plugin
Outbound requests from browsers to unknown domains immediately after loading pages that embed IP Locator functionality
Newly created administrator accounts or modified user roles following visits by privileged users

Detection Strategies

Review WordPress access logs for requests to pages using the IP Locator plugin containing suspicious query strings, fragments, or encoded payloads such as %3Cscript%3E
Deploy Content Security Policy (CSP) reporting to capture violations from inline script execution originating on plugin-rendered pages
Scan installed plugin versions across WordPress estates and flag ip-locator at version 4.1.0 or earlier

Monitoring Recommendations

Monitor authenticated user sessions for anomalous privilege changes or content edits following link clicks
Alert on browser console errors or CSP violations tied to the plugin's JavaScript assets
Ingest WordPress and web server telemetry into a centralized platform to correlate suspicious URLs with subsequent account activity

How to Mitigate CVE-2025-30826

Immediate Actions Required

Identify all WordPress sites running the Pierre Lannoy IP Locator plugin and inventory installed versions
Update IP Locator to a version later than 4.1.0 once the vendor publishes a fixed release
Restrict low-privileged account creation and enforce phishing-resistant authentication for editors and administrators

Patch Information

The advisory identifies all versions through 4.1.0 as vulnerable. Administrators should consult the Patchstack Vulnerability Report and the plugin's WordPress.org listing for the latest fixed release and upgrade guidance.

Workarounds

Deactivate and remove the IP Locator plugin until a patched version is available
Enforce a strict Content Security Policy that disallows inline scripts and untrusted origins on pages using the plugin
Configure a WAF rule to block requests containing common XSS payload patterns targeting plugin endpoints

bash

# Configuration example: identify vulnerable plugin installations via WP-CLI
wp plugin list --name=ip-locator --fields=name,status,version
wp plugin deactivate ip-locator
wp plugin delete ip-locator