CVE-2026-55872
GYM One is open-source gym management software for fitness centers, personal trainers, and sports…
- Risk score
- 55/100
- CVSS
- 8.7 v3.1
- Exploit chance (30 days)
- 0.2%
- Published
- 15 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it 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 renders the stored firstname, lastname, and email profile fields into the administrator user list without HTML output encoding. An attacker who can store values in th…
- Affected
- See advisory
- Fix
- Upgrade the product to 1.4.1 or later.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 8.7 high
References
- https://github.com/mayerbalintdev/GYM-One/commit/d3a0cf134f0ab3ac12aee7dca283b93c4290dcc4
- https://github.com/mayerbalintdev/GYM-One/releases/tag/V1.4.1
- https://github.com/mayerbalintdev/GYM-One/security/advisories/GHSA-75g9-vp9w-5388
- https://github.com/mayerbalintdev/GYM-One/security/advisories/GHSA-75g9-vp9w-5388
Original description
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 renders the stored firstname, lastname, and email profile fields into the administrator user list without HTML output encoding. An attacker who can store values in those fields can cause content to execute in an administrator's browser when the administrator visits /admin/users/. The persistent script can access administrator-session data or perform actions with the administrator's privileges until the stored record is removed. This issue is fixed in version 1.4.1.
Last activity 15 Oct 2026. Patch Forecast updates every hour.