CVE-2026-1581: wpForo Forum Plugin SQLi Vulnerability

CVE-2026-1581 Overview

The wpForo Forum plugin for WordPress contains a time-based SQL Injection vulnerability in the wpfob parameter affecting all versions up to and including 2.4.14. This vulnerability stems from insufficient escaping of user-supplied input and inadequate preparation of SQL queries. Unauthenticated attackers can exploit this flaw to append malicious SQL queries to existing database operations, potentially extracting sensitive information from the WordPress database.

Critical Impact

Unauthenticated attackers can extract sensitive data from WordPress databases including user credentials, email addresses, and other confidential information stored by the wpForo Forum plugin.

Affected Products

• wpForo Forum plugin for WordPress versions up to and including 2.4.14

Discovery Timeline

• February 19, 2026 - CVE-2026-1581 published to NVD
• February 19, 2026 - Last updated in NVD database

Technical Details for CVE-2026-1581

Vulnerability Analysis

This SQL Injection vulnerability (CWE-89) exists in the wpForo Forum plugin's handling of the wpfob parameter. The vulnerability is classified as a time-based blind SQL injection, which means attackers can infer database contents by observing response timing differences when injecting SQL queries that cause deliberate delays.

The attack is network-accessible and requires no authentication or user interaction, making it particularly dangerous for public-facing WordPress installations. While the vulnerability allows unauthorized read access to database contents, it does not directly enable data modification or system availability impact.

Root Cause

The vulnerability originates from two interrelated issues in the wpForo plugin's codebase. The plugin fails to properly escape user-supplied input passed through the wpfob parameter, and the existing SQL queries lack sufficient prepared statement implementation. This combination allows raw user input to be concatenated directly into SQL queries, enabling injection attacks.

The vulnerable code paths can be found in the Topics.php class and the main wpforo.php file.

Attack Vector

The attack vector is network-based, requiring an attacker to craft malicious HTTP requests containing SQL injection payloads in the wpfob parameter. Since the vulnerability is time-based, attackers use conditional SQL statements with time delays (such as SLEEP() in MySQL) to extract data bit by bit. When the injected condition evaluates to true, the database delays its response, allowing the attacker to infer information about the database structure and contents.

This technique, while slower than error-based or union-based SQL injection, is highly reliable and can be automated using tools like SQLMap to systematically extract entire database tables.

Detection Methods for CVE-2026-1581

Indicators of Compromise

• Unusual HTTP requests containing SQL syntax in the wpfob parameter
• Database query logs showing unexpected SLEEP(), BENCHMARK(), or WAITFOR DELAY commands
• Abnormally slow response times from wpForo-related endpoints indicating time-based injection attempts
• Web server access logs with encoded SQL injection patterns targeting forum functionality

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block SQL injection patterns in the wpfob parameter
• Enable WordPress database query logging and monitor for suspicious query patterns
• Implement rate limiting on wpForo endpoints to slow down automated extraction attempts
• Use intrusion detection systems (IDS) with signatures for time-based SQL injection techniques

Monitoring Recommendations

• Monitor web application logs for requests with unusually long response times to wpForo endpoints
• Set up alerts for database connections that remain open longer than expected
• Track failed login attempts and unusual data access patterns that may indicate credential extraction
• Review WordPress security audit logs for anomalous forum activity

How to Mitigate CVE-2026-1581

Immediate Actions Required

• Update the wpForo Forum plugin to the latest patched version immediately
• Review database access logs for signs of prior exploitation
• Consider temporarily disabling the wpForo plugin if immediate patching is not possible
• Reset database credentials and WordPress user passwords if compromise is suspected

Patch Information

The wpForo development team has released a security patch addressing this vulnerability. The fix is available in the WordPress plugin changeset 3459801. Site administrators should update to the latest version of wpForo Forum through the WordPress plugin management interface or by manually downloading the patched version from the WordPress plugin repository.

For detailed vulnerability information, refer to the Wordfence Vulnerability Report.

Workarounds

• Implement Web Application Firewall rules to filter SQL injection patterns in all wpForo-related parameters
• Use WordPress security plugins with SQL injection protection capabilities
• Restrict database user permissions to limit the impact of potential SQL injection attacks
• Consider placing the WordPress site behind a reverse proxy with request inspection capabilities

# Example WAF rule for ModSecurity to block SQL injection in wpfob parameter
SecRule ARGS:wpfob "@detectSQLi" \
    "id:100001,\
    phase:2,\
    deny,\
    status:403,\
    log,\
    msg:'SQL Injection attempt detected in wpfob parameter - CVE-2026-1581'"