CVE-2026-55872— GYM One admin user list is vulnerable to stored cross-site scripting
Quick assessment
Affected
mayerbalintdev GYM-One
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
GYM One 是一款面向健身中心、私人教练和体育俱乐部的开源健身房管理软件。在版本 1.4.1 之前，GYM One 的 admin/users/index.php 页面在渲染存储的用户个人资料字段（包括名字、姓氏和电子邮件）时，未进行 HTML 输出编码。攻击者若能在这些字段中存储恶意值，当管理员访问 /admin/users/ 页面时，即可导致恶意内容在管理员浏览器中执行。该持久化脚本可在被存储的恶意记录被删除前，访问管理员会话数据或以管理员权限执行操作。此问题已在版本 1.4.1 中得到修复。
Possible ATT&CK Techniques 2 AI
T1059 · Command and Scripting Interpreter T1189 · Drive-by CompromiseAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| mayerbalintdev | GYM-One | < 1.4.1 |
affected |
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I. Basic Information for CVE-2026-55872
Vulnerability Information
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Vulnerability Title
GYM One admin user list is vulnerable to stored cross-site scripting
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| mayerbalintdev | GYM-One | < 1.4.1 | - |
|
II. Public POCs for CVE-2026-55872
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-55872 (1)
Proof of Concept for CVE-2026-55872 (1)
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🔗 Release V1.4.1 · mayerbalintdev/GYM-One · GitHub x_refsource_MISC
IV. Related Vulnerabilities
Same weakness: CWE-79
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SiteOrigin CSS <= 1.6.7 - Unauthenticated Stored DOM-Based C -
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V. Comments for CVE-2026-55872
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