{"id":"CVE-2026-55872","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-55872","generatedAt":"2026-10-27T23:57:03.981Z","title":"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/.","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.","published":"2026-10-15T19:17:41.000Z","lastModified":"2026-10-21T01:17:39.000Z","status":"Deferred","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":8.7,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N"},"cwe":["CWE-79"],"affected":[],"epss":{"score":0.0029,"percentile":0.21402,"date":"2026-10-26","history":[{"date":"2026-10-16","score":0.00229,"percentile":0.12709}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.29%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-15T19:17:41.000Z","detail":{"score":"8.7","severity":"HIGH","publishedAt":"2026-10-15T19:17:41.303Z"},"summary":"New CVE, high severity (CVSS 8.7)."}],"references":[{"url":"https://github.com/mayerbalintdev/GYM-One/commit/d3a0cf134f0ab3ac12aee7dca283b93c4290dcc4","source":"security-advisories@github.com"},{"url":"https://github.com/mayerbalintdev/GYM-One/releases/tag/V1.4.1","source":"security-advisories@github.com"},{"url":"https://github.com/mayerbalintdev/GYM-One/security/advisories/GHSA-75g9-vp9w-5388","source":"security-advisories@github.com"},{"url":"https://github.com/mayerbalintdev/GYM-One/security/advisories/GHSA-75g9-vp9w-5388","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-55872","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}