CVE-2026-55871: GYM One: Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') in admin/users/index.php
GYM One is open-source gym management software for fitness centers, personal trainers, and sports clubs. Prior to 1.4.1, GYM One's admin/users/index.php concatenates the searchname and searchemail GET parameters into both the user-list query and the COUNT query used for pagination without prepared statements. An authenticated administrator can inject SQL through either search field to read data from arbitrary tables, including user information and password hashes. Depending on database permissions, the same injection may also permit filesystem writes. This issue is fixed in version 1.4.1.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
GYM Oneto a version that resolves this vulnerability.Fixed in 1.4.1
Event History
Frequently Asked Questions
Who can exploit this issue?
An authenticated GYM One administrator can exploit it remotely. The vulnerable inputs are the search_name and search_email GET parameters in the administrative user-list page.
What can an attacker do with successful exploitation?
An attacker can inject SQL to read data from arbitrary database tables, including user information and password hashes. If the database account has sufficient permissions, the injection may also allow filesystem writes.
Which deployments are affected and how is the issue fixed?
GYM One versions prior to 1.4.1 are affected. Upgrade to version 1.4.1, which fixes the vulnerable query handling.