CVE-2026-55872High· 8.7▾ MidnightPoC availableGYM 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 administra…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 47.8 · likelihood 0.1 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.2%
Exploit / PoC code exists
0.2% → 0.3%
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.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-55871Medium· 6.5GYM One is open-source gym management software for fitness centers, personal trainers, and sports clubs
CVE-2021-41184Medium· 6.5jQuery-UI is the official jQuery user interface library
CVE-2021-41182Medium· 6.5jQuery-UI is the official jQuery user interface library
CVE-2020-3580Medium· 6.1Multiple vulnerabilities in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to conduct cross-site scripting …
CVE-2015-20116Medium· 6.1RealtyScript 4.0.2 Stored Cross-Site Scripting via CSV File Upload Filename
CVE-2015-20119Medium· 6.4RealtyScript 4.0.2 Stored Cross-Site Scripting via text Parameter in pages.php