CVE-2026-1390: Redirect Countdown Plugin CSRF Vulnerability

CVE-2026-1390 Overview

The Redirect countdown plugin for WordPress is vulnerable to Cross-Site Request Forgery (CSRF) in all versions up to, and including, 1.0. This vulnerability exists due to missing nonce validation on the countdown_settings_content() function. As a result, unauthenticated attackers can update the plugin settings—including the countdown timeout, redirect URL, and custom text—via a forged request, provided they can trick a site administrator into performing an action such as clicking on a malicious link.

Critical Impact

Attackers can manipulate plugin settings to redirect site visitors to malicious destinations or inject harmful content without authentication, requiring only social engineering of an administrator.

Affected Products

• Redirect countdown plugin for WordPress version 1.0 and earlier

Discovery Timeline

• 2026-03-21 - CVE CVE-2026-1390 published to NVD
• 2026-03-23 - Last updated in NVD database

Technical Details for CVE-2026-1390

Vulnerability Analysis

This Cross-Site Request Forgery vulnerability stems from the plugin's failure to implement proper CSRF protection mechanisms in the administrative settings interface. WordPress plugins that handle configuration changes should validate request authenticity using nonces—cryptographic tokens that verify requests originate from legitimate admin sessions.

The countdown_settings_content() function processes settings updates without verifying a nonce token. This architectural flaw allows attackers to craft malicious HTML pages or links that, when visited by an authenticated administrator, silently submit forged requests to modify plugin settings.

The attack surface includes the ability to alter the countdown timeout duration, change the redirect URL (potentially directing visitors to phishing or malware sites), and modify custom display text. While the integrity impact is limited to plugin configuration, the consequences can cascade to affect all site visitors through malicious redirects.

Root Cause

The root cause is CWE-352 (Cross-Site Request Forgery)—specifically, the absence of nonce validation in the countdown_settings_content() function. WordPress provides built-in functions like wp_nonce_field() and wp_verify_nonce() to protect against CSRF attacks, but these were not implemented in the vulnerable code path. The vulnerable code can be examined at the WordPress Plugin Code repository.

Attack Vector

The attack requires network access and user interaction. An attacker must:

1. Craft a malicious webpage or email containing a forged form submission or JavaScript that targets the plugin's settings endpoint
2. Trick an authenticated WordPress administrator into visiting the malicious page or clicking a link
3. The forged request executes in the context of the administrator's session, modifying plugin settings without their knowledge

The attacker does not require any prior authentication to the target WordPress site. Once successful, the modified redirect URL could send site visitors to attacker-controlled domains for phishing, malware distribution, or credential harvesting.

Detection Methods for CVE-2026-1390

Indicators of Compromise

• Unexpected changes to Redirect countdown plugin settings, particularly the redirect URL pointing to external or suspicious domains
• Administrator accounts showing access patterns inconsistent with normal usage, such as settings modifications without corresponding admin panel login activity
• Web server logs containing POST requests to the plugin settings endpoint from unexpected referrer URLs
• Site visitors reporting being redirected to unfamiliar or malicious websites

Detection Strategies

• Monitor WordPress plugin settings for unauthorized modifications using file integrity monitoring or configuration change detection
• Implement web application firewall rules to detect and block requests with suspicious referrer headers or missing expected parameters
• Review admin action logs for settings changes that lack corresponding authenticated session activity
• Deploy browser-based protections to warn administrators about potentially malicious external links

Monitoring Recommendations

• Enable WordPress audit logging to capture all plugin configuration changes with timestamp and source IP information
• Configure alerts for any modifications to the Redirect countdown plugin settings outside normal maintenance windows
• Implement egress monitoring to detect if site visitors are being redirected to newly added or suspicious external domains
• Regularly review the redirect URL configuration against an approved whitelist of legitimate destinations

How to Mitigate CVE-2026-1390

Immediate Actions Required

• Verify current Redirect countdown plugin settings have not been tampered with, especially the redirect URL field
• Temporarily deactivate the Redirect countdown plugin until a patched version is available if redirect functionality is not critical
• Educate WordPress administrators to avoid clicking links in unsolicited emails or messages while logged into the admin panel
• Implement additional browser-based CSRF protections such as SameSite cookie attributes on WordPress session cookies

Patch Information

Check for updates to the Redirect countdown plugin through the WordPress plugin repository. The vulnerability affects all versions up to and including 1.0. A patched version should implement proper nonce validation in the countdown_settings_content() function. Monitor the Wordfence Vulnerability Report for remediation guidance and the WordPress Plugin trunk code for patch availability.

Workarounds

• Restrict WordPress admin panel access to trusted IP addresses using .htaccess rules or web server configuration to limit the attack surface
• Use a web application firewall (WAF) with CSRF protection rules that validate request origin and referrer headers
• Implement Content Security Policy (CSP) headers on the WordPress site to reduce the effectiveness of external page-based CSRF attacks
• Consider using alternative redirect plugins that implement proper CSRF protections until this plugin is patched

# Example: Restrict WordPress admin access by IP in .htaccess
<Files wp-admin>
    Order Deny,Allow
    Deny from all
    Allow from 192.168.1.0/24
    Allow from 10.0.0.0/8
</Files>