CVE-2025-14555: WordPress Countdown Timer XSS Vulnerability

CVE-2025-14555 Overview

The Countdown Timer – Widget Countdown plugin for WordPress contains a Stored Cross-Site Scripting (XSS) vulnerability in the wpdevart_countdown shortcode. All versions up to and including 2.7.7 are affected due to insufficient input sanitization and output escaping on user-supplied attributes. This vulnerability allows authenticated attackers with contributor-level access or above to inject arbitrary web scripts into pages that execute whenever a user accesses the compromised page.

Critical Impact

Authenticated attackers can inject persistent malicious scripts that execute in victims' browsers, potentially leading to session hijacking, credential theft, defacement, or further attack propagation across the WordPress site.

Affected Products

• Countdown Timer – Widget Countdown plugin for WordPress versions ≤ 2.7.7

Discovery Timeline

• January 10, 2026 - CVE-2025-14555 published to NVD
• January 13, 2026 - Last updated in NVD database

Technical Details for CVE-2025-14555

Vulnerability Analysis

This Stored XSS vulnerability exists within the plugin's shortcode processing functionality. When the wpdevart_countdown shortcode is rendered, user-supplied attributes are not properly sanitized before being output to the page. The vulnerable code paths have been identified in the front_end.php file at multiple locations, specifically around lines 30, 48, and 167 according to the WordPress plugin repository references.

The attack requires contributor-level authentication, which represents a significant subset of WordPress users who can create and edit posts. Once malicious script content is injected through the shortcode attributes, it persists in the database and executes every time any user (including administrators) views the affected page.

Root Cause

The root cause is insufficient input sanitization and output escaping in the shortcode attribute handling. WordPress provides several escaping functions such as esc_attr(), esc_html(), and wp_kses() that should be applied to user-controlled data before rendering. The Countdown Timer plugin failed to properly implement these security measures on attributes passed to the wpdevart_countdown shortcode, allowing arbitrary script injection.

Attack Vector

The attack is network-based and requires low-privilege authenticated access. An attacker with contributor-level permissions can craft a malicious countdown widget using the shortcode with script-injected attributes. When saved, this payload persists in the WordPress database. Any visitor or administrator viewing the page containing the malicious shortcode will have the injected script execute in their browser context, potentially exposing session cookies, enabling phishing attacks, or facilitating further compromise of the WordPress installation.

The vulnerability mechanism involves improper handling of shortcode attributes in the front_end.php file. When the shortcode is processed, attacker-controlled values are rendered directly into the HTML output without proper escaping, allowing JavaScript execution. For technical implementation details, see the vulnerable code references in the WordPress plugin repository.

Detection Methods for CVE-2025-14555

Indicators of Compromise

• Presence of unexpected JavaScript or HTML tags within wpdevart_countdown shortcode attributes in post content
• Unusual script execution or browser behavior when viewing pages containing countdown widgets
• Database entries in wp_posts containing shortcode attributes with encoded or obfuscated script content
• Unexpected network requests to external domains originating from countdown widget pages

Detection Strategies

• Review WordPress posts and pages containing [wpdevart_countdown] shortcodes for suspicious attribute values
• Monitor for JavaScript content embedded within shortcode parameters using database queries
• Implement Content Security Policy (CSP) headers to detect and block inline script execution
• Deploy web application firewall (WAF) rules to identify XSS payloads in POST requests to WordPress editor endpoints

Monitoring Recommendations

• Enable detailed logging for post creation and modification by contributor-level users
• Configure alerts for posts containing script tags or event handlers within shortcode content
• Monitor browser console errors and CSP violation reports for signs of blocked XSS attempts
• Review WordPress audit logs for unusual shortcode usage patterns

How to Mitigate CVE-2025-14555

Immediate Actions Required

• Update the Countdown Timer – Widget Countdown plugin to the patched version immediately
• Audit existing posts and pages for malicious content within wpdevart_countdown shortcodes
• Review user accounts with contributor-level access and above for any unauthorized or suspicious accounts
• Consider temporarily disabling the plugin until the update can be applied

Patch Information

A security patch has been released to address this vulnerability. The fix can be found in WordPress Changeset #3425959. Update the Countdown Timer – Widget Countdown plugin through the WordPress admin dashboard or by downloading the latest version from the WordPress plugin repository. For detailed vulnerability information, refer to the Wordfence Vulnerability Report.

Workarounds

• Restrict contributor-level access to trusted users only until the plugin is updated
• Temporarily disable the Countdown Timer – Widget Countdown plugin if immediate patching is not possible
• Implement a Web Application Firewall (WAF) with XSS filtering rules to block malicious payloads
• Use Content Security Policy headers to prevent inline script execution as an additional defense layer

To implement CSP headers as a temporary mitigation, add the following to your server configuration or WordPress security plugin:

# Apache .htaccess configuration
Header set Content-Security-Policy "script-src 'self'; object-src 'none';"