CVE-2026-39637: SpabRice Mogi Auth Bypass Vulnerability

CVE-2026-39637 Overview

CVE-2026-39637 is a Missing Authorization vulnerability in the SpabRice Mogi WordPress theme that allows attackers to exploit incorrectly configured access control security levels. This vulnerability enables arbitrary shortcode execution due to improper authorization checks, potentially allowing unauthenticated users to execute functionality that should be restricted.

Critical Impact

Unauthenticated attackers can exploit misconfigured access controls to execute arbitrary shortcodes, potentially leading to information disclosure and further compromise of WordPress installations.

Affected Products

• SpabRice Mogi WordPress Theme versions through 1.2.3

Discovery Timeline

• April 8, 2026 - CVE-2026-39637 published to NVD
• April 9, 2026 - Last updated in NVD database

Technical Details for CVE-2026-39637

Vulnerability Analysis

This vulnerability is classified as CWE-862 (Missing Authorization), which occurs when a software component does not perform an authorization check when an actor attempts to access a resource or perform an action. In the context of the Mogi WordPress theme, the vulnerability allows attackers to execute arbitrary shortcodes without proper authentication or authorization verification.

The attack can be performed remotely over the network without requiring any privileges or user interaction. While the impact is limited to confidentiality exposure rather than full system compromise, unauthorized shortcode execution can lead to sensitive information disclosure depending on which shortcodes are available within the WordPress installation.

Root Cause

The root cause of this vulnerability lies in the failure to implement proper authorization checks before processing shortcode execution requests. The Mogi theme does not adequately verify whether the requesting user has the appropriate permissions to execute specific shortcodes, allowing unauthenticated or low-privileged users to access functionality intended only for authenticated administrators.

Attack Vector

The vulnerability is exploitable remotely over the network. An attacker can send crafted requests to the vulnerable WordPress installation running the Mogi theme to trigger arbitrary shortcode execution. Since no authentication is required and the attack complexity is low, this vulnerability is accessible to a wide range of threat actors.

The attack does not require user interaction, meaning victims do not need to click malicious links or perform any actions for the exploit to succeed. This network-based attack vector combined with the lack of authentication requirements makes the vulnerability particularly accessible for opportunistic exploitation.

Detection Methods for CVE-2026-39637

Indicators of Compromise

• Unusual HTTP requests targeting shortcode-related endpoints in the Mogi theme
• Unexpected shortcode execution logged in WordPress activity logs
• Authentication bypass attempts in web server access logs
• Anomalous database queries related to shortcode processing

Detection Strategies

• Monitor WordPress access logs for requests to Mogi theme endpoints from unauthenticated sessions
• Implement web application firewall (WAF) rules to detect shortcode injection patterns
• Review server logs for suspicious patterns indicating access control bypass attempts
• Use WordPress security plugins to monitor for unauthorized shortcode execution

Monitoring Recommendations

• Enable detailed logging for WordPress theme activities and shortcode processing
• Configure alerts for unusual patterns in theme-related HTTP requests
• Implement file integrity monitoring for Mogi theme files
• Regularly audit WordPress user sessions and access patterns

How to Mitigate CVE-2026-39637

Immediate Actions Required

• Update the Mogi WordPress theme to a patched version when available from SpabRice
• Consider temporarily disabling or replacing the Mogi theme until a security patch is released
• Implement web application firewall rules to block unauthorized shortcode execution attempts
• Review WordPress user permissions and restrict shortcode capabilities to trusted roles only

Patch Information

For detailed vulnerability information and remediation guidance, consult the Patchstack WordPress Vulnerability Report. Users should monitor SpabRice for official security updates to the Mogi theme that address this missing authorization vulnerability.

Workarounds

• Implement server-level access controls to restrict access to theme endpoints from untrusted sources
• Use a security plugin to enforce additional authorization checks on shortcode execution
• Consider using .htaccess rules or server configuration to limit access to vulnerable theme components
• Deploy a WAF with custom rules to filter malicious shortcode execution requests

# Example .htaccess restriction for WordPress theme protection
# Add to your WordPress .htaccess file to limit theme endpoint access
<IfModule mod_rewrite.c>
  RewriteEngine On
  RewriteCond %{REQUEST_URI} ^/wp-content/themes/mogi/
  RewriteCond %{HTTP_COOKIE} !wordpress_logged_in
  RewriteRule .* - [F,L]
</IfModule>