CVE-2025-39481: Imithemes Eventer SQL Injection Flaw

CVE-2025-39481 Overview

CVE-2025-39481 is a critical Blind SQL Injection vulnerability affecting the imithemes Eventer WordPress plugin, a popular event booking management solution. The vulnerability stems from improper neutralization of special elements used in SQL commands, allowing unauthenticated attackers to execute arbitrary SQL queries against the underlying database. This flaw affects all versions of the Eventer plugin prior to version 3.11.4.

Critical Impact

Unauthenticated attackers can exploit this Blind SQL Injection vulnerability to extract sensitive data, modify database contents, or potentially achieve full database compromise on affected WordPress installations.

Affected Products

• imithemes Eventer WordPress Plugin (versions prior to 3.11.4)
• WordPress installations running vulnerable Eventer plugin versions
• Any website using Eventer for event booking management

Discovery Timeline

• 2025-05-16 - CVE-2025-39481 published to NVD
• 2026-01-22 - Last updated in NVD database

Technical Details for CVE-2025-39481

Vulnerability Analysis

This vulnerability is classified under CWE-89 (Improper Neutralization of Special Elements used in an SQL Command). The Eventer plugin fails to properly sanitize user-supplied input before incorporating it into SQL queries, creating an exploitable Blind SQL Injection condition.

In a Blind SQL Injection scenario, attackers cannot directly see the results of their injected queries in the application's response. Instead, they infer information by observing differences in application behavior—such as response times or conditional responses—based on whether injected SQL conditions evaluate to true or false. This technique allows attackers to systematically extract sensitive database contents character by character.

The network-accessible nature of this vulnerability, combined with no authentication requirements, makes it particularly dangerous. Attackers can remotely target any WordPress site running the vulnerable plugin without needing valid credentials or user interaction.

Root Cause

The root cause of this vulnerability lies in insufficient input validation and sanitization within the Eventer plugin's data processing logic. User-controlled parameters are directly concatenated into SQL queries without proper escaping, parameterization, or use of prepared statements. This allows malicious SQL syntax to be interpreted and executed by the database engine.

WordPress provides built-in functions like $wpdb->prepare() for safe database queries, but the vulnerable code paths in Eventer failed to implement these protections properly. This oversight enables attackers to inject arbitrary SQL fragments that alter the intended query logic.

Attack Vector

The attack vector for CVE-2025-39481 is network-based, requiring no authentication or user interaction. An attacker can craft malicious HTTP requests containing SQL injection payloads targeting vulnerable parameters within the Eventer plugin.

Using time-based or boolean-based blind injection techniques, the attacker can:

1. Enumerate database structure (tables, columns)
2. Extract sensitive data including user credentials and personal information
3. Modify or delete database records
4. Potentially escalate to remote code execution if database permissions allow file operations

The blind nature of the injection requires attackers to use inference techniques, but automated tools like SQLMap can efficiently exploit such vulnerabilities. For detailed technical analysis, refer to the Patchstack Security Advisory.

Detection Methods for CVE-2025-39481

Indicators of Compromise

• Unusual database query patterns in MySQL/MariaDB logs showing SQL injection syntax
• HTTP requests containing SQL keywords like UNION, SELECT, SLEEP(), BENCHMARK(), or boolean operators in unusual parameters
• Abnormal database response times potentially indicating time-based injection attempts
• Web application firewall logs showing blocked SQL injection attempts targeting Eventer endpoints

Detection Strategies

• Deploy web application firewall (WAF) rules specifically targeting SQL injection patterns in requests to Eventer plugin endpoints
• Enable and monitor WordPress debug logging for database errors and anomalous queries
• Implement database activity monitoring to detect unusual query patterns or data exfiltration attempts
• Configure intrusion detection systems (IDS) with signatures for common SQL injection attack patterns

Monitoring Recommendations

• Review access logs for requests containing encoded or obfuscated SQL injection payloads
• Monitor database server performance metrics for unexplained spikes that could indicate time-based injection
• Set up alerts for multiple failed or unusual database queries originating from web application connections
• Audit database user accounts for unauthorized privilege escalation or new administrative accounts

How to Mitigate CVE-2025-39481

Immediate Actions Required

• Update the Eventer WordPress plugin to version 3.11.4 or later immediately
• Audit WordPress installations to identify all instances running vulnerable Eventer versions
• Review database logs for any evidence of prior exploitation attempts
• Consider temporarily disabling the Eventer plugin if immediate patching is not possible

Patch Information

imithemes has addressed this vulnerability in Eventer version 3.11.4. Administrators should update through the WordPress plugin management interface or by downloading the patched version directly from the WordPress plugin repository. After updating, verify the installed version matches 3.11.4 or higher.

For additional context and vulnerability details, see the Patchstack vulnerability database entry.

Workarounds

• Implement a Web Application Firewall (WAF) with SQL injection protection rules as a temporary mitigation layer
• Restrict database user privileges to minimize potential damage from successful exploitation
• Use WordPress security plugins that provide real-time SQL injection blocking capabilities
• Consider blocking direct access to vulnerable Eventer endpoints via .htaccess rules if plugin functionality can be temporarily disabled

# Example WAF rule to block common SQL injection patterns
# Add to .htaccess or WAF configuration
<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteCond %{QUERY_STRING} (\%27)|(\')|(\-\-)|(\%23)|(#) [NC,OR]
    RewriteCond %{QUERY_STRING} (union|select|insert|drop|delete|update|benchmark|sleep) [NC]
    RewriteRule ^(.*)$ - [F,L]
</IfModule>