CVE-2025-68857: Paid Downloads Plugin SQLi Vulnerability

CVE-2025-68857 Overview

CVE-2025-68857 is a SQL Injection vulnerability affecting the WordPress Paid Downloads plugin developed by ichurakov. This vulnerability allows attackers to perform Blind SQL Injection attacks against WordPress installations running vulnerable versions of the plugin. SQL Injection flaws enable malicious actors to manipulate database queries, potentially leading to unauthorized data access, data modification, or complete database compromise.

Critical Impact

Attackers can exploit this Blind SQL Injection vulnerability to extract sensitive information from the WordPress database, including user credentials, payment information, and other confidential data stored by the Paid Downloads plugin.

Affected Products

• WordPress Paid Downloads plugin versions up to and including 3.15
• WordPress sites using the paid-downloads plugin by ichurakov

Discovery Timeline

• 2026-01-22 - CVE CVE-2025-68857 published to NVD
• 2026-01-22 - Last updated in NVD database

Technical Details for CVE-2025-68857

Vulnerability Analysis

This vulnerability is classified as CWE-89: Improper Neutralization of Special Elements used in an SQL Command, commonly known as SQL Injection. The Paid Downloads plugin fails to properly sanitize user-supplied input before incorporating it into SQL queries executed against the WordPress database.

Blind SQL Injection is particularly dangerous because it allows attackers to extract data from the database even when error messages are suppressed. Attackers can use time-based or boolean-based techniques to infer information about the database structure and contents one character at a time.

Root Cause

The root cause of this vulnerability lies in insufficient input validation and the absence of parameterized queries or prepared statements within the Paid Downloads plugin. User-controlled input is concatenated directly into SQL query strings without proper escaping or sanitization, allowing attackers to inject malicious SQL syntax that alters the intended query logic.

Attack Vector

The attack vector for this vulnerability involves crafting specially formatted input that, when processed by the vulnerable plugin, modifies the underlying SQL query structure. In a Blind SQL Injection scenario, the attacker submits payloads designed to produce observable differences in application behavior based on true or false conditions within the injected SQL.

The vulnerability can be exploited through time-based blind techniques where the attacker injects SQL commands that cause deliberate time delays (such as SLEEP() functions), or through boolean-based techniques that produce different page responses depending on the injected condition's truth value. For detailed technical information about exploitation mechanics, refer to the Patchstack security advisory.

Detection Methods for CVE-2025-68857

Indicators of Compromise

• Unusual database query patterns or slow query logs showing SQL injection payloads
• Web server access logs containing SQL syntax characters such as single quotes, UNION, SELECT, or SLEEP() in request parameters
• Abnormal database load or response times indicating time-based SQL injection attempts
• Unexpected database errors or application behavior anomalies

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block SQL injection patterns targeting the Paid Downloads plugin
• Enable WordPress database query logging and monitor for suspicious query structures
• Deploy intrusion detection systems (IDS) with signatures for common SQL injection payloads
• Review application logs for repeated requests with varying SQL injection test patterns

Monitoring Recommendations

• Monitor for unusual database activity including unexpected SELECT queries against sensitive tables
• Set up alerts for requests containing SQL injection indicators such as UNION SELECT, OR 1=1, SLEEP(), or BENCHMARK()
• Track authentication and authorization events for signs of privilege escalation following potential database compromise
• Implement real-time log correlation to identify SQL injection attack campaigns

How to Mitigate CVE-2025-68857

Immediate Actions Required

• Update the Paid Downloads plugin immediately when a patched version becomes available
• Temporarily disable the Paid Downloads plugin if it is not critical to site operations
• Implement a Web Application Firewall (WAF) with SQL injection protection rules
• Audit database access logs for signs of prior exploitation
• Consider restricting database user privileges used by WordPress to minimum required permissions

Patch Information

At the time of publication, users should check the WordPress plugin repository and the Patchstack vulnerability database for the latest patched version of the Paid Downloads plugin. Users running version 3.15 or earlier are affected and should update as soon as a fix is released.

Workarounds

• Deploy a WAF with rules specifically blocking SQL injection attempts targeting the plugin's vulnerable endpoints
• Use WordPress security plugins that provide SQL injection protection and request filtering
• Restrict access to the WordPress admin area and plugin functionality to trusted IP addresses only
• Implement database-level monitoring and query auditing to detect exploitation attempts
• Consider using database user accounts with read-only permissions where write access is not required

# Example: WordPress .htaccess rules to block common SQL injection patterns
# Add to your WordPress .htaccess file

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{QUERY_STRING} [a-zA-Z0-9_]=http:// [OR]
RewriteCond %{QUERY_STRING} [a-zA-Z0-9_]=(\.\.//?)+ [OR]
RewriteCond %{QUERY_STRING} [a-zA-Z0-9_]=/([a-z0-9_.]//?)+ [NC,OR]
RewriteCond %{QUERY_STRING} \=PHP[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12} [NC,OR]
RewriteCond %{QUERY_STRING} (\.\./|\.\.) [OR]
RewriteCond %{QUERY_STRING} ftp\: [NC,OR]
RewriteCond %{QUERY_STRING} http\: [NC,OR]
RewriteCond %{QUERY_STRING} https\: [NC,OR]
RewriteCond %{QUERY_STRING} \=\|w\| [NC,OR]
RewriteCond %{QUERY_STRING} ^.*(\[|\]|\(|\)|<|>|'|"|;|\?|\*|=$).* [NC,OR]
RewriteCond %{QUERY_STRING} ^.*("|'|<|>|\|{||).* [NC,OR]
RewriteCond %{QUERY_STRING} (union)(.*)(select) [NC,OR]
RewriteCond %{QUERY_STRING} (concat)(.*)(\() [NC]
RewriteRule ^(.*)$ - [F,L]
</IfModule>