CVE-2025-4131 Overview
The GmapsMania plugin for WordPress contains a Stored Cross-Site Scripting (XSS) vulnerability in its gmap shortcode. All versions up to and including 1.1 fail to properly sanitize user-supplied attributes and escape output. Authenticated users with contributor-level access or higher can inject arbitrary JavaScript into pages. The malicious script executes in the browser of any visitor who loads the affected page. The flaw is tracked as CWE-79 and affects any WordPress site running the plugin with untrusted contributor accounts.
Critical Impact
Contributor-level attackers can persist JavaScript payloads that execute against site visitors and administrators, enabling session theft, forced actions, and content defacement.
Affected Products
- GmapsMania plugin for WordPress, versions up to and including 1.1
- WordPress sites permitting contributor-level or higher registrations
- Any page rendering the plugin's gmap shortcode with attacker-supplied attributes
Discovery Timeline
- 2025-05-02 - CVE-2025-4131 published to the National Vulnerability Database
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-4131
Vulnerability Analysis
The vulnerability resides in the plugin's gmap shortcode handler in gmapsmania.php. The handler accepts shortcode attributes directly from post content and emits them into rendered HTML without applying WordPress sanitization functions such as esc_attr() or esc_html(). A contributor who authors a post can supply attribute values containing HTML or JavaScript, which the plugin embeds verbatim in the page markup. When a visitor loads the resulting page, the browser parses the injected markup and executes attacker-controlled script in the context of the site origin. Because the payload is stored in post content, it persists across page loads and affects every viewer, including administrators who preview or moderate the post. The scope changes to the visitor's browser session, allowing cookie theft, CSRF-style actions, and DOM manipulation.
Root Cause
The root cause is missing input sanitization and output escaping on shortcode attributes. The plugin trusts that shortcode authors supply well-formed values and never normalizes attribute content before echoing it into HTML. WordPress provides sanitize_text_field(), esc_attr(), and wp_kses() for exactly this purpose, none of which are applied in the affected code path referenced in the plugin source.
Attack Vector
Exploitation requires an authenticated account with contributor privileges. The attacker creates or edits a post containing the gmap shortcode with a malicious attribute value, for example an onerror handler or a closing quote followed by a <script> tag. Once the post is rendered, whether in a public listing, preview, or after publication, the payload executes in the viewer's browser. See the Wordfence advisory for additional technical detail.
Detection Methods for CVE-2025-4131
Indicators of Compromise
- Post or page content containing [gmap ...] shortcodes with attribute values that include HTML tags, javascript: URIs, or event handlers such as onerror, onload, or onclick
- Unexpected <script> blocks or inline event handlers appearing in rendered post HTML that references the GmapsMania plugin output
- Contributor accounts submitting posts with abnormally long or encoded shortcode attribute values
Detection Strategies
- Audit the wp_posts table for shortcode attributes containing angle brackets, quotes, or on*= event handler patterns
- Deploy a web application firewall rule matching shortcode payloads with embedded script constructs
- Monitor browser console errors and Content Security Policy violation reports for inline-script blocks originating from plugin-rendered pages
Monitoring Recommendations
- Log and review new contributor account registrations and their first published content
- Alert on edits to published posts that introduce script-like patterns within shortcode attributes
- Track outbound requests from visitor browsers to unknown domains that could indicate credential exfiltration from an injected payload
How to Mitigate CVE-2025-4131
Immediate Actions Required
- Deactivate the GmapsMania plugin on any WordPress installation running version 1.1 or earlier until a patched release is available
- Review published posts and pages for the gmap shortcode and remove any entries containing suspicious attribute values
- Restrict contributor-level accounts to trusted users and audit recent registrations for anomalies
Patch Information
No vendor-supplied patched version is referenced in the NVD entry at the time of publication. Site operators should monitor the plugin repository and the Wordfence advisory for a fixed release and apply it as soon as it becomes available.
Workarounds
- Remove or disable the plugin and replace map embeds with a maintained alternative
- Enforce a strict Content Security Policy that disallows inline scripts and event handlers to blunt payload execution
- Temporarily revoke the edit_posts capability from the contributor role, or require editor review before content is rendered publicly
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
