Concrete CMS (formerly concrete5) below 8.5.10 and between 9.0.0 and 9.1.2 is vulnerable to Reflected XSS in the multilingual report due to un-sanitized output. Remediate by updating to Concrete CMS 9.1.3+ or 8.5.10+.
https://github.com/advisories/GHSA-vq39-q549-g786
https://www.concretecms.org/about/project-news/security/concrete-cms-security-advisory-2022-10-31
https://documentation.concretecms.org/developers/introduction/version-history/913-release-notes
https://documentation.concretecms.org/developers/introduction/version-history/8510-release-notes