CVE-2026-57380 Overview
CVE-2026-57380 is a DOM-based Cross-Site Scripting (XSS) vulnerability in the hupe13 Extensions for Leaflet Map WordPress plugin. The flaw affects all versions of extensions-leaflet-map up to and including 5.1. It stems from improper neutralization of input during web page generation, classified under [CWE-79]. Attackers can execute arbitrary JavaScript in a victim's browser when the user visits a crafted page or link. Exploitation requires user interaction but does not require authentication. The vulnerability was published to the National Vulnerability Database (NVD) on July 13, 2026.
Critical Impact
Successful exploitation allows attackers to execute arbitrary scripts in the context of the victim's browser session, potentially leading to session hijacking, credential theft, and unauthorized actions on the affected WordPress site.
Affected Products
- hupe13 Extensions for Leaflet Map (extensions-leaflet-map) plugin for WordPress
- All versions from initial release through 5.1
- WordPress sites with the vulnerable plugin activated
Discovery Timeline
- 2026-07-13 - CVE-2026-57380 published to NVD
- 2026-07-13 - Last updated in NVD database
Technical Details for CVE-2026-57380
Vulnerability Analysis
The vulnerability is a DOM-based Cross-Site Scripting flaw in the Extensions for Leaflet Map plugin. The plugin fails to properly neutralize user-controllable input before it is written to the Document Object Model (DOM). When a victim loads a page containing attacker-crafted data, client-side JavaScript processes that input and injects it into the DOM without sanitization. The browser then interprets the injected content as executable script.
Because exploitation occurs entirely on the client side, malicious payloads may not appear in server-side logs. The scope is marked as changed, meaning the compromised component can affect resources beyond its own security authority. This allows the injected script to interact with the broader WordPress page context, including cookies and DOM elements owned by other components.
Root Cause
The root cause is missing or insufficient output encoding of user-supplied input rendered by the plugin's client-side JavaScript. Input flowing from sources such as URL parameters, location.hash, or attacker-influenced page data reaches a DOM sink without being escaped or sanitized. This maps directly to [CWE-79]: Improper Neutralization of Input During Web Page Generation.
Attack Vector
An attacker crafts a URL or page containing a malicious JavaScript payload targeting the vulnerable Leaflet map component. The attacker delivers this link through phishing, social media, or a compromised page. When a victim clicks the link and the plugin's script processes the input, the payload executes in the victim's browser. No authentication is required, but user interaction is necessary to trigger the flaw.
No verified exploit code is publicly available. See the Patchstack Vulnerability Report for advisory details.
Detection Methods for CVE-2026-57380
Indicators of Compromise
- Unexpected <script> tags, event handlers, or javascript: URIs appearing in Leaflet map DOM elements.
- Outbound browser requests to unfamiliar domains originating from pages that render the plugin.
- Suspicious query strings or URL fragments containing HTML or JavaScript payloads targeting map-related parameters.
Detection Strategies
- Inventory WordPress installations to identify sites running extensions-leaflet-map version 5.1 or earlier.
- Review web server access logs for requests with encoded script fragments (%3Cscript, onerror=, javascript:) directed at pages containing the plugin.
- Deploy a Content Security Policy (CSP) in report-only mode to surface unexpected inline script execution on map-enabled pages.
Monitoring Recommendations
- Alert on anomalous JavaScript execution or DOM modifications on pages that embed Leaflet maps.
- Monitor for authenticated administrator sessions initiating unusual actions shortly after visiting front-end map pages.
- Track WordPress plugin version drift centrally to identify hosts that remain unpatched.
How to Mitigate CVE-2026-57380
Immediate Actions Required
- Identify all WordPress instances running Extensions for Leaflet Map version 5.1 or earlier.
- Update the plugin to a fixed version once released by the vendor, or deactivate and remove it until a patch is available.
- Rotate administrator credentials and invalidate active sessions on sites where exploitation is suspected.
Patch Information
The vulnerability affects extensions-leaflet-map through version 5.1. Consult the Patchstack Vulnerability Report for the latest fixed version and vendor guidance. Apply the update through the WordPress plugin management console or via automated update tooling.
Workarounds
- Deactivate the Extensions for Leaflet Map plugin until a patched version is installed.
- Deploy a Web Application Firewall (WAF) rule that blocks requests containing script tags or common XSS payloads targeting plugin endpoints.
- Enforce a strict Content Security Policy that disallows inline scripts and restricts script sources to trusted origins.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
