CVE-2026-57771 Overview
CVE-2026-57771 is a Blind SQL Injection vulnerability in the Milan Petrovic GD Rating System WordPress plugin (gd-rating-system). The flaw affects all versions from initial release through version 3.7. Authenticated attackers with low privileges can inject malicious SQL statements through improperly sanitized input parameters. Successful exploitation lets attackers extract sensitive data from the WordPress database using time-based or boolean-based inference techniques. The issue is tracked under CWE-89: Improper Neutralization of Special Elements used in an SQL Command.
Critical Impact
Authenticated attackers can execute arbitrary SQL queries against the WordPress database, leading to disclosure of user credentials, session tokens, and other confidential data across the entire site.
Affected Products
- Milan Petrovic GD Rating System plugin for WordPress
- All plugin versions up to and including 3.7
- WordPress sites with the gd-rating-system plugin activated
Discovery Timeline
- 2026-07-13 - CVE-2026-57771 published to the National Vulnerability Database (NVD)
- 2026-07-13 - Last updated in NVD database
Technical Details for CVE-2026-57771
Vulnerability Analysis
The vulnerability resides in the GD Rating System plugin's handling of user-supplied input passed into SQL queries. The plugin fails to properly neutralize special SQL characters before concatenating request parameters into database queries. This exposes the plugin to Blind SQL Injection, where attackers infer data by observing conditional responses or query execution timing rather than receiving direct query output.
Exploitation requires low-privilege authentication, meaning any user with an active WordPress account, including a subscriber, can attempt the attack. Because the vulnerability has a changed scope, a successful injection impacts resources beyond the plugin itself, including the entire WordPress database.
Root Cause
The root cause is the absence of parameterized queries or proper input escaping when constructing SQL statements. The plugin passes tainted request data directly into query strings rather than using $wpdb->prepare() with placeholders. WordPress provides the $wpdb abstraction specifically to prevent this class of flaw, but the plugin bypasses these safeguards in one or more code paths through version 3.7.
Attack Vector
The attack vector is network-based and requires no user interaction. An authenticated attacker sends a crafted HTTP request to a vulnerable plugin endpoint. The injected payload uses boolean or time-based techniques to force the database to reveal information one character at a time. Refer to the Patchstack Vulnerability Report for technical details on the affected parameters.
Because the injection is blind, attackers typically automate exploitation with tools such as sqlmap, iterating through characters using conditional payloads that produce different response times or HTTP status codes.
Detection Methods for CVE-2026-57771
Indicators of Compromise
- HTTP requests to gd-rating-system plugin endpoints containing SQL metacharacters such as ', ", UNION, SLEEP(, BENCHMARK(, or CASE WHEN
- Anomalously long response times from WordPress requests targeting rating-related URLs, indicating time-based injection attempts
- Repeated authenticated requests from a single account iterating query parameter values in rapid succession
- Unexpected database errors in PHP or MySQL logs referencing plugin query paths
Detection Strategies
- Deploy WordPress-aware web application firewall (WAF) rules that inspect authenticated requests to plugin endpoints for SQL injection signatures
- Monitor MySQL slow query logs for queries containing sleep(), benchmark(), or unusually complex boolean logic originating from the plugin
- Correlate authenticated user sessions with high volumes of parameterized requests to rating endpoints
Monitoring Recommendations
- Enable WordPress query logging and forward events to a centralized logging platform for retention and analysis
- Alert on subscriber or low-privilege accounts generating high request volumes to admin-ajax or plugin REST endpoints
- Review wp_users and wp_usermeta tables for unauthorized changes following any suspicious activity
How to Mitigate CVE-2026-57771
Immediate Actions Required
- Deactivate the GD Rating System plugin on any site running version 3.7 or earlier until a patched release is applied
- Audit all WordPress user accounts and revoke unnecessary low-privilege access
- Rotate WordPress salts, administrator passwords, and API keys if exploitation is suspected
- Review database contents for signs of unauthorized reads or modifications
Patch Information
At the time of publication, the advisory covers versions up to and including 3.7. Site administrators should monitor the Patchstack Vulnerability Report and the plugin's official channels for a fixed release, and upgrade immediately once available.
Workarounds
- Remove the gd-rating-system plugin directory if a patch is not yet available and the functionality is not business-critical
- Restrict access to WordPress registration to prevent unauthenticated adversaries from acquiring low-privilege accounts
- Deploy WAF rules that block SQL injection payloads targeting plugin request parameters
- Enforce least privilege on the database user configured in wp-config.php so that plugin queries cannot access unrelated schemas
# Disable the vulnerable plugin via WP-CLI
wp plugin deactivate gd-rating-system
wp plugin delete gd-rating-system
# Verify removal
wp plugin list --status=active | grep gd-rating-system
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
