CVE-2026-3781: WordPress Attendance Manager SQLi Flaw

CVE-2026-3781 Overview

The Attendance Manager plugin for WordPress is vulnerable to SQL Injection via the attmgr_off parameter in all versions up to, and including, 0.6.2. This vulnerability stems from insufficient escaping on user-supplied parameters and a lack of sufficient preparation on existing SQL queries. Authenticated attackers with Subscriber-level access and above can append additional SQL queries into already existing queries, enabling extraction of sensitive information from the database.

Critical Impact

Authenticated attackers with low-privilege Subscriber accounts can exploit this SQL injection vulnerability to extract sensitive database information, potentially compromising user credentials, personal data, and other confidential information stored in the WordPress database.

Affected Products

• WordPress Attendance Manager Plugin versions up to and including 0.6.2
• WordPress installations using vulnerable versions of Attendance Manager

Discovery Timeline

• 2026-04-08 - CVE-2026-3781 published to NVD
• 2026-04-08 - Last updated in NVD database

Technical Details for CVE-2026-3781

Vulnerability Analysis

This SQL injection vulnerability (CWE-89) exists in the Attendance Manager plugin's form handling functionality. The vulnerable code is located in the class-form.php file, specifically around lines 142-148. The plugin fails to properly sanitize user input passed through the attmgr_off parameter before incorporating it into database queries.

The vulnerability allows attackers with authenticated access (Subscriber-level or above) to manipulate SQL queries by injecting malicious SQL code through the vulnerable parameter. Since the plugin does not use parameterized queries or proper input escaping, attacker-controlled input is directly concatenated into SQL statements, enabling database manipulation.

Root Cause

The root cause of this vulnerability is improper input validation and the absence of prepared statements in the SQL query construction. The attmgr_off parameter is directly incorporated into SQL queries without adequate sanitization or escaping. WordPress provides built-in functions like $wpdb->prepare() for safely constructing SQL queries with user-supplied data, but these security measures were not implemented in the vulnerable code paths.

Attack Vector

The attack is network-accessible and requires low-privilege authenticated access to the WordPress site. An attacker with at least Subscriber-level permissions can craft malicious requests containing SQL injection payloads in the attmgr_off parameter. The injected SQL code is then executed against the WordPress database, allowing the attacker to:

• Extract sensitive user data including usernames, email addresses, and password hashes
• Access plugin configuration and site settings
• Enumerate database structure and table contents
• Potentially escalate privileges by modifying user roles in the database

The vulnerability exploits the form handling mechanism in the Attendance Manager plugin. When a request containing the malicious attmgr_off parameter is processed, the unsanitized input is appended to an existing SQL query. Technical details of the vulnerable code can be found in the WordPress Plugin Source Code repository.

Detection Methods for CVE-2026-3781

Indicators of Compromise

• Unusual database queries containing UNION SELECT, OR 1=1, or other SQL injection patterns in web server logs
• Requests to WordPress endpoints with suspicious attmgr_off parameter values containing SQL syntax
• Database access logs showing queries accessing tables outside normal plugin operations
• Unexpected data extraction or changes to user records in the WordPress database

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect SQL injection patterns in the attmgr_off parameter
• Monitor web server access logs for requests containing common SQL injection payloads targeting the Attendance Manager plugin endpoints
• Enable WordPress database query logging to identify anomalous query patterns
• Deploy intrusion detection systems with signatures for SQL injection attacks targeting WordPress plugins

Monitoring Recommendations

• Configure alerts for failed or unusual database authentication attempts following web requests to the Attendance Manager plugin
• Monitor for bulk data extraction patterns that may indicate successful exploitation
• Review WordPress user account changes, especially privilege escalations, that may result from database manipulation
• Implement regular integrity checks on critical database tables to detect unauthorized modifications

How to Mitigate CVE-2026-3781

Immediate Actions Required

• Update the Attendance Manager plugin to a patched version when available from the WordPress plugin repository
• If no patch is available, consider temporarily deactivating the Attendance Manager plugin until a fix is released
• Review WordPress user accounts and remove or restrict unnecessary Subscriber-level accounts
• Implement a Web Application Firewall (WAF) with SQL injection protection rules

Patch Information

At the time of publication, administrators should check the WordPress plugin repository for updates to the Attendance Manager plugin. The vulnerability affects all versions up to and including 0.6.2. For detailed vulnerability analysis, refer to the Wordfence Vulnerability Analysis.

Workarounds

• Implement server-level input filtering to block requests containing SQL injection patterns in the attmgr_off parameter
• Use a security plugin with virtual patching capabilities to filter malicious input before it reaches the vulnerable code
• Restrict access to the plugin's functionality to only trusted administrator accounts by modifying user capabilities
• Consider using database-level query restrictions to limit the scope of potential SQL injection attacks

# Example: Apache .htaccess rule to block suspicious requests
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{QUERY_STRING} attmgr_off=.*(\%27|\'|union|select|insert|drop|delete|update|concat|char|0x) [NC]
RewriteRule .* - [F,L]
</IfModule>