CVE-2025-25117 Overview
CVE-2025-25117 is a stored Cross-Site Scripting (XSS) vulnerability in the Smart Countdown FX WordPress plugin developed by Alex Polonski. The flaw stems from improper neutralization of user-supplied input during web page generation [CWE-79]. Attackers with authenticated low-privileged access can inject persistent JavaScript payloads that execute in the browsers of users who view the affected pages. The vulnerability affects all versions of Smart Countdown FX up to and including 1.5.5. Because the scripting context crosses a security boundary, the impact extends beyond the vulnerable component to other browser resources.
Critical Impact
Authenticated attackers can store malicious JavaScript that executes in visitor browsers, enabling session theft, credential harvesting, and unauthorized administrative actions.
Affected Products
- Alex Polonski Smart Countdown FX plugin for WordPress
- Smart Countdown FX versions from n/a through 1.5.5
- WordPress sites with the smart-countdown-fx plugin installed and activated
Discovery Timeline
- 2025-02-07 - CVE-2025-25117 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-25117
Vulnerability Analysis
The Smart Countdown FX plugin fails to sanitize and escape user-controlled input before rendering it inside generated HTML. An authenticated user with low privileges, such as a contributor, can inject arbitrary JavaScript into plugin-managed fields. The payload persists in the WordPress database and executes when a victim loads an affected page. Because the vulnerability changes the security scope, injected scripts can access resources outside the initial vulnerable component, including cookies and DOM elements belonging to the WordPress administrative interface. Exploitation requires user interaction, typically consisting of an administrator or editor visiting a page rendered with the malicious content.
Root Cause
The plugin performs insufficient input validation and output encoding on parameters supplied through countdown configuration fields. Input containing HTML or script tags is stored verbatim and rendered without HTML entity encoding or context-aware escaping. WordPress capability checks alone do not prevent contributor-level accounts from submitting the tainted values.
Attack Vector
Exploitation proceeds over the network against an authenticated session. An attacker with contributor or higher privileges submits a countdown configuration containing a JavaScript payload. The payload is stored in the WordPress database. When a higher-privileged user renders or previews the affected content, the browser executes the script under the site origin, enabling session token theft, forced administrative actions through the WordPress REST API, or drive-by malware delivery to public visitors. See the Patchstack Vulnerability Report for additional technical detail.
Detection Methods for CVE-2025-25117
Indicators of Compromise
- Unexpected <script>, onerror, or onload attributes stored in wp_postmeta or wp_options rows associated with Smart Countdown FX shortcodes.
- Outbound requests from browsers viewing WordPress pages to unfamiliar third-party domains hosting JavaScript payloads.
- New or modified WordPress administrator accounts created shortly after a contributor edits a countdown widget.
Detection Strategies
- Scan plugin configuration fields and post content for HTML event handlers, javascript: URIs, and encoded script tags.
- Enable web application firewall rules that block reflected and stored XSS patterns targeting WordPress plugin endpoints.
- Correlate low-privileged user edits of countdown widgets with subsequent administrator session anomalies.
Monitoring Recommendations
- Monitor WordPress audit logs for edit_post and update_option actions performed by contributor-level accounts on smart-countdown-fx content.
- Alert on Content Security Policy violation reports referencing inline scripts on pages using the plugin.
- Track anomalous administrative REST API calls originating from browsers with active editor or administrator sessions.
How to Mitigate CVE-2025-25117
Immediate Actions Required
- Deactivate the Smart Countdown FX plugin on any WordPress instance running version 1.5.5 or earlier until a patched release is confirmed.
- Audit contributor, author, and editor accounts and revoke access for users that do not require it.
- Review all existing countdown widgets and posts for injected script content and remove tainted entries.
Patch Information
As of the last NVD update, no fixed version is listed in the enriched data. Site operators should consult the Patchstack Vulnerability Report and the plugin author's release notes for a patched build superseding 1.5.5. Apply the update through the WordPress plugin dashboard once available and verify the installed version.
Workarounds
- Replace Smart Countdown FX with a maintained countdown plugin that performs proper output escaping.
- Deploy a Content Security Policy that disallows inline scripts and restricts script sources to trusted origins.
- Restrict the unfiltered_html capability and require administrator review of contributor submissions before publication.
# Configuration example: enforce a strict Content Security Policy in Apache
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'self'"
# Disable the plugin from WP-CLI as an interim mitigation
wp plugin deactivate smart-countdown-fx
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
