CVE-2026-24572: Nelio Content SQLi Vulnerability

CVE-2026-24572 Overview

CVE-2026-24572 is a Blind SQL Injection vulnerability affecting the Nelio Content WordPress plugin developed by Nelio Software. This vulnerability arises from improper neutralization of special elements used in SQL commands, allowing authenticated attackers to inject malicious SQL queries and potentially compromise the underlying database.

The vulnerability enables attackers with low-privilege authenticated access to perform blind SQL injection attacks against WordPress installations running vulnerable versions of the Nelio Content plugin. Blind SQL injection is particularly dangerous because it allows attackers to extract sensitive data from the database without direct error feedback, using time-based or boolean-based inference techniques.

Critical Impact

Authenticated attackers can exploit this SQL injection vulnerability to extract sensitive data, modify database contents, or potentially escalate privileges within WordPress installations using Nelio Content plugin version 4.1.0 and earlier.

Affected Products

• Nelio Content WordPress Plugin version 4.1.0 and earlier
• WordPress installations with vulnerable Nelio Content plugin versions
• All previous versions through 4.1.0

Discovery Timeline

• 2026-01-23 - CVE-2026-24572 published to NVD
• 2026-01-26 - Last updated in NVD database

Technical Details for CVE-2026-24572

Vulnerability Analysis

This vulnerability is classified under CWE-89 (Improper Neutralization of Special Elements used in an SQL Command), which describes the classic SQL injection weakness pattern. The Nelio Content plugin fails to properly sanitize user-supplied input before incorporating it into SQL queries, creating an avenue for blind SQL injection attacks.

In blind SQL injection scenarios, the application does not return SQL error messages or query results directly to the attacker. Instead, attackers must infer information about the database structure and contents by observing the application's behavior—such as response times (time-based blind injection) or differences in page content (boolean-based blind injection).

The attack requires network access and low-privilege authentication (such as a subscriber or contributor WordPress role), but does not require user interaction to execute. Successful exploitation can result in complete compromise of database confidentiality, integrity, and availability.

Root Cause

The root cause of this vulnerability is insufficient input validation and sanitization within the Nelio Content plugin's database query handling. User-controlled input is concatenated directly into SQL statements without proper parameterization or escaping, allowing specially crafted input to modify the intended query logic.

WordPress provides several secure methods for database interactions, including the $wpdb->prepare() function for parameterized queries. The vulnerable code path in Nelio Content fails to utilize these protective mechanisms, leaving the SQL construction vulnerable to injection attacks.

Attack Vector

The attack vector is network-based, requiring authenticated access to the WordPress installation. An attacker with valid credentials (even low-privilege accounts) can send specially crafted requests to the vulnerable plugin endpoint. The malicious SQL payload is processed by the backend database, allowing the attacker to:

1. Extract sensitive data - User credentials, personal information, and other database contents
2. Modify data - Alter, insert, or delete database records
3. Bypass authentication - Potentially escalate privileges or access administrator accounts
4. Database enumeration - Map database structure, tables, and columns

The blind nature of the injection requires the attacker to use inference techniques. For time-based attacks, the attacker includes SQL commands like SLEEP() or BENCHMARK() to cause measurable delays. For boolean-based attacks, the attacker observes differences in application responses based on true/false conditions in the injected query.

For technical details on this vulnerability, refer to the Patchstack Security Advisory.

Detection Methods for CVE-2026-24572

Indicators of Compromise

• Unusual database query patterns in WordPress database logs
• Abnormal response times on pages utilizing Nelio Content functionality
• Unexpected database connection spikes or errors
• Evidence of data exfiltration or unauthorized database modifications

Detection Strategies

• Monitor web application firewall (WAF) logs for SQL injection attempt patterns targeting nelio-content plugin endpoints
• Implement database activity monitoring to detect anomalous query patterns
• Review WordPress access logs for suspicious authenticated requests with SQL metacharacters
• Deploy intrusion detection signatures for common blind SQL injection payloads

Monitoring Recommendations

• Enable WordPress debug logging to capture database query errors
• Configure database slow query logging to detect time-based injection attempts
• Implement real-time alerting on WAF SQL injection rule triggers
• Regularly audit WordPress user accounts for unauthorized privilege changes

How to Mitigate CVE-2026-24572

Immediate Actions Required

• Update Nelio Content plugin to the latest patched version immediately
• Review database logs for evidence of exploitation attempts
• Audit WordPress user accounts and reset passwords for administrative users
• Consider temporarily deactivating the Nelio Content plugin until patching is complete

Patch Information

Organizations should update the Nelio Content WordPress plugin to a version newer than 4.1.0. Check the official WordPress plugin repository or the Patchstack Advisory for the latest security update information.

Workarounds

• Deploy a Web Application Firewall (WAF) with SQL injection protection rules
• Restrict plugin access to trusted administrator accounts only
• Implement additional input validation at the server level
• Consider using WordPress security plugins that provide SQL injection protection

# WordPress CLI command to check and update Nelio Content plugin
wp plugin status nelio-content
wp plugin update nelio-content

# Verify plugin version after update
wp plugin get nelio-content --field=version