Reflected Cross-Site Scripting in IsMyGym by Zuinq Studio
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Active
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
Reflected Cross-Site Scripting (CWE-79) in the IsMyGym gym management software by Zuinq Studio, tracked as CVE-2026-4316 and GHSA-c9jm-46h6-xj8j. The reservation endpoint reflects the 'ret' parameter into the HTTP response without proper sanitization, so an attacker can inject arbitrary JavaScript that runs in the victim's browser. CVSS 4.0 scores it 5.1 (MEDIUM). The vulnerability is not in CISA's KEV catalog, and CISA's SSVC rates its exploitation as none.
Written with Claude Haiku 5.5 from the sources below · 2026-10-28
Description from the CNA
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Zuinq Studio | IsMyGym | before v6.0.85 | v6.0.85 | Patch available | CNA |
- IsMyGym VendorZuinq Studio Affected before v6.0.85 Fixed in v6.0.85 Patch available CNA
Remediation
Update IsMyGym to v6.0.85 or later. Versions prior to v6.0.85 are affected.
Written with Claude Haiku 5.5 from the sources below · 2026-10-28
- Fix · CNA IsMyGym (Zuinq Studio) Fixed in v6.0.85
Timeline
- 2026-10-26 Threatist record created from CVE-2026-4316
- 2026-10-26 CISA SSVC decision points changed
- 2026-10-27 Alias added: GHSA-c9jm-46h6-xj8j
References
More Zuinq Studio vulnerabilities
- TI-2025-27431 Reflected Cross-Site Scripting (XSS) in IsMyGym CVSS 4.0MEDIUM 5.1
Sources
- CVE-2026-4316 · CVE Program
- CVE-2026-4316 · NVD
- FIRST EPSS
- GHSA-c9jm-46h6-xj8j · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences