mayerbalintdev GYM-One up to 1.4.0 admin/users/index.php search_name/search_email sql injection

Summaryinfo

A vulnerability, which was classified as problematic, has been found in mayerbalintdev GYM-One up to 1.4.0. This affects an unknown part of the file admin/users/index.php. The manipulation of the argument search_name/search_email leads to sql injection. This vulnerability is referenced as CVE-2026-55871. Remote exploitation of the attack is possible. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in mayerbalintdev GYM-One up to 1.4.0. It has been rated as problematic. This issue affects an unknown functionality of the file admin/users/index.php. The manipulation of the argument search_name/search_email with an unknown input leads to a sql injection vulnerability. Using CWE to declare the problem leads to CWE-89. The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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 search_name and search_email 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.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-55871 since 06/17/2026. The exploitation is known to be easy. The attack may be initiated remotely. The exploitation requires an enhanced level of successful authentication. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1505 for this issue.

By approaching the search of inurl:admin/users/index.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 1.4.1 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• mayerbalintdev

Name

• GYM-One

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4.0

Website

• Product: https://github.com/mayerbalintdev/GYM-One/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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