CVE-2025-54026: GymBase Theme Classes SQLi Vulnerability

CVE-2025-54026 Overview

CVE-2025-54026 is a SQL Injection vulnerability in the QuanticaLabs GymBase Theme Classes plugin (gymbase_classes) for WordPress. The flaw stems from improper neutralization of special elements in SQL commands [CWE-89]. All versions up to and including 1.4 are affected. An authenticated attacker with low privileges can inject malicious SQL statements through vulnerable input parameters. The vulnerability operates over the network and can impact data residing outside the plugin's immediate security scope due to its scope-changed nature.

Critical Impact
Authenticated attackers can extract sensitive WordPress database contents, including user credentials and configuration data, by injecting crafted SQL payloads through the GymBase Theme Classes plugin.

Affected Products

QuanticaLabs GymBase Theme Classes plugin (gymbase_classes)
All versions from n/a through 1.4
WordPress installations using the affected plugin

Discovery Timeline

2025-07-16 - CVE-2025-54026 published to NVD
2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-54026

Vulnerability Analysis

CVE-2025-54026 is a SQL Injection flaw classified under [CWE-89]. The GymBase Theme Classes plugin fails to properly sanitize user-supplied input before incorporating it into SQL queries. Attackers can manipulate query logic by injecting SQL syntax through parameters processed by the plugin.

Exploitation requires low-level authenticated access but does not require user interaction. The scope-changed classification indicates impact can extend beyond the plugin into the broader WordPress database. Successful exploitation enables high-impact data confidentiality breaches and limited availability disruption.

The plugin operates within WordPress as an extension for gym and fitness business websites, managing class schedules and related data. Database queries handling these schedules appear to lack proper parameterization or input filtering.

Root Cause

The root cause is the absence of proper input sanitization and parameterized queries within the gymbase_classes plugin code. User-controlled input flows directly into SQL statements without escaping, validation, or use of prepared statements such as $wpdb->prepare(). This allows special SQL characters to alter the structure and semantics of database queries.

Attack Vector

An authenticated attacker with low privileges sends crafted HTTP requests containing malicious SQL fragments to plugin endpoints. The plugin concatenates these values into SQL queries executed against the WordPress database. Attackers can use UNION-based, boolean-based, or time-based blind SQL injection techniques to extract data from tables including wp_users, wp_options, and wp_usermeta. Detailed technical analysis is available in the Patchstack Vulnerability Report.

Detection Methods for CVE-2025-54026

Indicators of Compromise

Anomalous database queries containing SQL keywords such as UNION SELECT, SLEEP(, INFORMATION_SCHEMA, or -- originating from GymBase plugin endpoints
HTTP requests with encoded SQL metacharacters (%27, %22, 0x) targeting gymbase_classes parameters
Unexpected outbound data transfers following requests to plugin URLs
Unusual authenticated user activity accessing class management functions

Detection Strategies

Deploy a web application firewall (WAF) with rules tuned for SQL injection patterns targeting WordPress plugin endpoints
Enable MySQL general query log or slow query log to identify malformed queries originating from the plugin
Monitor WordPress access logs for repeated requests to GymBase plugin URLs containing suspicious query strings
Correlate authenticated session activity with database error responses indicating injection attempts

Monitoring Recommendations

Alert on HTTP 500 responses from plugin endpoints, which often indicate failed injection attempts
Track query patterns against wp_users and wp_usermeta tables outside normal application flow
Review WordPress user role assignments for unauthorized privilege changes
Baseline normal request volumes to GymBase plugin endpoints and alert on deviations

How to Mitigate CVE-2025-54026

Immediate Actions Required

Identify all WordPress sites running the QuanticaLabs GymBase Theme Classes plugin version 1.4 or earlier
Disable the plugin until a patched version becomes available from the vendor
Restrict access to authenticated user accounts and audit recent low-privilege user activity
Review database logs and WordPress audit trails for signs of exploitation

Patch Information

At the time of publication, the vendor advisory indicates the vulnerability affects versions up to and including 1.4. Administrators should consult the Patchstack Vulnerability Report for current patch status and apply any released update immediately.

Workarounds

Deploy WAF rules that block SQL injection payloads targeting the plugin's query parameters
Restrict plugin functionality to trusted administrative users only by enforcing role-based access
Place the WordPress site behind a reverse proxy with input filtering for known injection patterns
Rotate database credentials and WordPress secret keys if compromise is suspected

bash

# Example WAF rule (ModSecurity) blocking SQL keywords on plugin paths
SecRule REQUEST_URI "@contains /wp-content/plugins/gymbase_classes/" \
    "chain,deny,status:403,id:1054026,msg:'Possible SQLi on GymBase plugin'"
SecRule ARGS "@rx (?i)(union\s+select|sleep\s*\(|information_schema|--\s|/\*)"