CVE-2026-4316 PUBLISHED

Reflected Cross-Site Scripting in software IsMyGym by Zuinq Studio

Assigner: INCIBE
Reserved: 17.03.2026 Published: 26.10.2026 Updated: 26.10.2026

Reflected Cross-Site Scripting (XSS) in Gym Management Software IsMyGym by Zuinq Studio affecting the reservation endpoint where the 'ret' parameter is reflected in the HTTP response without any proper sanitization. Successfull explotation of this vulnerability could allow an attacker to inject arbitrary JavaScript code executed in the context of the victim’s browser.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
CVSS Score: 5.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	Low	Confidentiality	None
Attack Complexity	Low	Integrity	Low	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	None
User Interaction	Active

CVSS 4.0

Product Status

Vendor	Zuinq Studio
Product	IsMyGym
Versions	Default: unaffected Version versions prior to v6.0.85 is affected

Solutions

The vulnerability has been fixed by Zuinq Studio team in version v6.0.85.

Credits

Gonzalo Aguilar García (6h4ack) finder

References

https://www.incibe.es/en/incibe-cert/notices/aviso/reflected-cross-site-scripting-software-ismygym-zuinq-studio

Problem Types

CWE-79 Improper neutralization of input during web page generation ('cross-site scripting') CWE

Impacts

CAPEC-591 Reflected XSS