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CVE-2026-55872

8.7 · HIGH

GYM One is open-source gym management software for fitness centers, personal trainers, and sports clubs.

Published Oct 15, 2026CWE-79EPSS 0.29%

Overview

CVE-2026-55872 is a high-severity vulnerability. It was published on October 15, 2026 and has a CVSS 3.1 base score of 8.7 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.7, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/mayerbalintdev/GYM-One/commit/d3a0cf134f0ab3ac12aee7dca283b93c4290dcc4GitHubgithub.com/mayerbalintdev/GYM-One/releases/tag/V1.4.1GitHubgithub.com/mayerbalintdev/GYM-One/security/advisories/GHSA-75g9-vp9w-5388GitHubgithub.com/mayerbalintdev/GYM-One/security/advisories/GHSA-75g9-vp9w-5388

How CyberStrike helps

Frequently asked questions

What is CVE-2026-55872?

CVE-2026-55872 is a high-severity vulnerability. It was published on October 15, 2026 and has a CVSS 3.1 base score of 8.7 (HIGH).

How severe is CVE-2026-55872?

This vulnerability has a CVSS 3.1 base score of 8.7, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-55872?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-55872?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-55872 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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