CVE-2026-24392: HurryTimer Stored XSS Vulnerability

CVE-2026-24392 Overview

CVE-2026-24392 is a Stored Cross-Site Scripting (XSS) vulnerability in the HurryTimer WordPress plugin developed by Nabil Lemsieh. The vulnerability stems from improper neutralization of input during web page generation, allowing attackers with high privileges to inject malicious scripts that persist in the application and execute in victims' browsers when they view affected pages.

Critical Impact

Attackers with administrative access can inject persistent malicious scripts that execute in the context of other users' sessions, potentially leading to session hijacking, credential theft, or further compromise of the WordPress installation.

Affected Products

• HurryTimer WordPress Plugin versions up to and including 2.14.2
• WordPress installations with vulnerable HurryTimer plugin active

Discovery Timeline

• 2026-02-19 - CVE-2026-24392 published to NVD
• 2026-02-19 - Last updated in NVD database

Technical Details for CVE-2026-24392

Vulnerability Analysis

This Stored XSS vulnerability (CWE-79) exists within the HurryTimer WordPress plugin, which is commonly used to create countdown timers and urgency elements on WordPress sites. The vulnerability requires high privileges to exploit, meaning an attacker would need administrative or editor-level access to inject the malicious payload. However, once injected, the stored script executes whenever a user views the affected page, making this a persistent threat with cross-scope impact affecting confidentiality, integrity, and availability.

The attack requires user interaction, as victims must navigate to pages containing the injected malicious content. The changed scope indicator means the vulnerable component (HurryTimer) can impact resources beyond its security scope, potentially affecting the broader WordPress installation and its users.

Root Cause

The root cause of this vulnerability is insufficient input sanitization and output encoding within the HurryTimer plugin. When processing user-supplied input for timer configurations or display elements, the plugin fails to properly neutralize special characters and script content before storing them in the database and rendering them in HTML output. This allows crafted input containing JavaScript payloads to be stored persistently and executed in users' browsers.

Attack Vector

The attack vector for CVE-2026-24392 is network-based, targeting WordPress installations with the vulnerable HurryTimer plugin. An attacker with elevated privileges (such as an administrator or compromised admin account) can access the plugin's configuration interface and inject malicious JavaScript code into timer configuration fields or other input areas that are later rendered on the frontend.

When legitimate users or administrators visit pages containing the injected content, the malicious script executes in their browser context. This can lead to session token theft, keylogging, phishing attacks displayed within the trusted domain, or chained attacks to escalate privileges or compromise additional user accounts.

The vulnerability mechanism involves injecting script tags or event handlers through improperly sanitized input fields within the HurryTimer plugin settings. These payloads are stored in the WordPress database and rendered without proper encoding when the timer elements are displayed. For detailed technical analysis, refer to the Patchstack security advisory.

Detection Methods for CVE-2026-24392

Indicators of Compromise

• Unusual JavaScript code within HurryTimer plugin database entries or configuration options
• Unexpected script tags or event handlers (such as onerror, onload, onclick) in timer HTML output
• Browser security console warnings about inline script execution on pages with countdown timers
• User reports of suspicious pop-ups or redirects when viewing pages with HurryTimer elements

Detection Strategies

• Review HurryTimer plugin configuration fields and database entries for embedded script content
• Implement Content Security Policy (CSP) headers to detect and block unauthorized inline script execution
• Monitor WordPress admin activity logs for suspicious changes to HurryTimer settings
• Use WordPress security plugins to scan for known XSS patterns in plugin data

Monitoring Recommendations

• Enable WordPress audit logging to track all changes to plugin configurations
• Implement real-time alerting for database modifications affecting HurryTimer-related tables
• Deploy endpoint protection solutions that can detect malicious script injection attempts
• Regularly review administrator account access and audit for compromised credentials

How to Mitigate CVE-2026-24392

Immediate Actions Required

• Update HurryTimer plugin to the latest patched version when available from the developer
• Review all HurryTimer timer configurations for suspicious or unexpected script content
• Audit WordPress administrator accounts and remove any unauthorized access
• Implement Web Application Firewall (WAF) rules to filter XSS payloads targeting HurryTimer inputs

Patch Information

Organizations should monitor the HurryTimer plugin's official WordPress repository and the developer's release notes for security updates addressing this vulnerability. The Patchstack vulnerability database provides additional details and patch status information. Until an official patch is available, consider temporarily disabling the plugin if countdown timer functionality is not critical.

Workarounds

• Temporarily deactivate the HurryTimer plugin until a patched version is released
• Implement strict Content Security Policy headers to prevent inline script execution
• Restrict administrative access to trusted users only and enable two-factor authentication
• Use a WordPress security plugin with XSS filtering capabilities to add an additional layer of protection

# Example Content Security Policy header configuration for Apache
# Add to .htaccess or Apache configuration
Header set Content-Security-Policy "script-src 'self'; object-src 'none';"

# For Nginx, add to server block
# add_header Content-Security-Policy "script-src 'self'; object-src 'none';";