HIGH

GHSA-9v2g-37mp-qpxf

Concrete CMS has Stored XSS through its height parameter

Quick fix

GHSA-9v2g-37mp-qpxf — concrete5/concrete5: upgrade to the fixed version with the command below.

composer require concrete5/concrete5:^9.5.1

Details

Concrete CMS 9.5.0 and below has Stored XSS on the height parameter. The controller does not validate or sanitize $height. Any user with editor privileges can inject malicious JavaScript that executes in the context of any visitor's browser, potentially leading to session hijacking, credential theft, or other malicious actions.

Are you affected?

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Affected packages

Packagist/concrete5/concrete5

Introduced in: 0Fixed in: 9.5.1

Fixcomposer require concrete5/concrete5:^9.5.1

References

https://nvd.nist.gov/vuln/detail/CVE-2026-8203[ADVISORY]
https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes[WEB]
https://github.com/concretecms/concretecms[PACKAGE]