CVE-2025-63018: Bard Authorization Bypass Vulnerability

CVE-2025-63018 Overview

CVE-2025-63018 is a Missing Authorization vulnerability (CWE-862) discovered in the wproyal Bard WordPress theme. This vulnerability allows attackers to exploit incorrectly configured access control security levels, potentially enabling unauthorized users to perform privileged actions that should be restricted.

The vulnerability exists due to insufficient authorization checks within the Bard theme's functionality, allowing attackers to bypass intended access controls and interact with protected resources or functionality without proper authentication or authorization validation.

Critical Impact

Unauthorized users may be able to access and modify theme settings or other protected functionality, potentially leading to website defacement, data exposure, or further compromise of the WordPress installation.

Affected Products

• wproyal Bard WordPress Theme versions through 2.229
• WordPress installations running vulnerable Bard theme versions

Discovery Timeline

• 2026-01-22 - CVE CVE-2025-63018 published to NVD
• 2026-01-22 - Last updated in NVD database

Technical Details for CVE-2025-63018

Vulnerability Analysis

This vulnerability falls under the category of Broken Access Control, specifically a Missing Authorization flaw. In WordPress themes, authorization mechanisms are critical for ensuring that only authenticated users with appropriate privileges can execute sensitive operations such as modifying theme options, accessing administrative features, or performing configuration changes.

The Bard theme fails to implement adequate authorization checks on certain functionality, creating a security gap that can be exploited by attackers. Without proper current_user_can() checks or nonce verification on sensitive operations, the theme exposes functionality that should be restricted to administrators or other privileged roles.

Root Cause

The root cause of CVE-2025-63018 is the absence of proper capability checks before executing privileged functionality within the Bard WordPress theme. WordPress provides built-in functions like current_user_can() to verify user capabilities and nonce verification to prevent CSRF attacks. When themes fail to implement these checks, unauthorized users—including unauthenticated visitors—may be able to trigger actions intended only for administrators.

This type of vulnerability typically occurs in AJAX handlers, REST API endpoints, or form processing functions where developers assume the WordPress admin interface provides sufficient protection without implementing explicit authorization checks.

Attack Vector

An attacker can exploit this vulnerability by directly accessing vulnerable endpoints or functions within the Bard theme without proper authentication. The attack typically involves:

1. Identifying AJAX actions or endpoints registered by the theme that lack proper authorization
2. Crafting requests to these endpoints that bypass normal administrative workflows
3. Executing privileged operations such as modifying theme settings or accessing sensitive data

Since this is a missing authorization vulnerability, the attacker does not need valid credentials to exploit it. They only need to identify and target the unprotected functionality within the theme. For detailed technical information about this vulnerability, refer to the Patchstack WordPress Vulnerability Report.

Detection Methods for CVE-2025-63018

Indicators of Compromise

• Unexpected changes to theme settings or options without corresponding administrator activity
• Suspicious HTTP requests targeting Bard theme AJAX endpoints from unauthenticated sessions
• Unusual modifications to WordPress options related to the Bard theme
• Log entries showing access to theme-specific endpoints without prior admin authentication

Detection Strategies

• Monitor WordPress wp_options table for unauthorized changes to Bard theme settings
• Implement web application firewall (WAF) rules to detect and block requests to vulnerable theme endpoints from unauthenticated users
• Review server access logs for patterns of requests targeting /wp-admin/admin-ajax.php with Bard theme-specific action parameters
• Deploy file integrity monitoring to detect unexpected modifications to theme files or database records

Monitoring Recommendations

• Enable detailed logging for WordPress AJAX requests and REST API calls
• Configure alerts for theme option changes that occur outside normal administrative sessions
• Implement real-time monitoring of user capability checks and authorization failures
• Review audit logs regularly for suspicious activity patterns related to theme functionality

How to Mitigate CVE-2025-63018

Immediate Actions Required

• Update the Bard WordPress theme to a patched version as soon as one becomes available from wproyal
• Review and audit current theme settings for any unauthorized modifications
• Implement a Web Application Firewall (WAF) to filter malicious requests targeting the theme
• Consider temporarily switching to a different theme if business-critical until a patch is released
• Restrict access to the WordPress admin panel using IP whitelisting or additional authentication layers

Patch Information

Users should monitor the wproyal vendor for security updates to the Bard theme. Check the WordPress theme repository or the vendor's official website for updated versions addressing this vulnerability. The Patchstack WordPress Vulnerability Report provides additional details about the vulnerability and remediation guidance.

Workarounds

• Implement additional access controls at the web server level using .htaccess rules or nginx configurations
• Deploy a WordPress security plugin that provides virtual patching capabilities for known vulnerabilities
• Restrict theme functionality by disabling or commenting out affected AJAX handlers if identifiable
• Use a Web Application Firewall with WordPress-specific rulesets to block exploitation attempts
• Consider implementing additional authentication requirements for sensitive theme operations using security plugins

# Example: Add basic protection in .htaccess to restrict admin-ajax.php access
# Place in WordPress root directory
<IfModule mod_rewrite.c>
    RewriteEngine On
    # Block direct POST requests to admin-ajax.php from non-authenticated sources
    # Note: This is a temporary mitigation - proper patching is required
    RewriteCond %{REQUEST_URI} ^/wp-admin/admin-ajax\.php$ [NC]
    RewriteCond %{HTTP_REFERER} !^https?://(www\.)?yourdomain\.com [NC]
    RewriteCond %{REQUEST_METHOD} POST
    RewriteRule .* - [F,L]
</IfModule>