High 8.7Published Oct 15, 2026

CVE-2026-55872GYM One admin user list is vulnerable to stored cross-site scripting

Updated under an hour ago (2026-10-19 10:10 UTC)

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It affects mayerbalintdev GYM-One. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.23%, higher than 13% of scored CVEs.

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Every CVE for mayerbalintdev GYM-One

Exploited in the last 30 days

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.

CVSS: 8.7 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.23% (percentile 13)
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 15, 2026

Affected products

Affected products

mayerbalintdev GYM-One mayerbalintdev:gym_one (from the name)	before 1.4.1	CNA record

References

https://github.com/mayerbalintdev/GYM-One/security/advisories/GHSA-75g9-vp9w-5388x-refsource-confirm
https://github.com/mayerbalintdev/GYM-One/commit/d3a0cf134f0ab3ac12aee7dca283b93c4290dcc4x-refsource-misc
https://github.com/mayerbalintdev/GYM-One/releases/tag/V1.4.1x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.