CVE-2017-7725: Concretecms Concrete CMS

Medium severity, CVSS 6.1. EPSS: 2.8% chance of exploitation in the next 30 days.

concrete5 8.1.0 places incorrect trust in the HTTP Host header during caching, if the administrator did not define a "canonical" URL on installation of concrete5 using the "Advanced Options" settings. Remote attackers can make a GET request with any domain name in the Host header; this is stored and allows for arbitrary domains to be set for certain links displayed to subsequent visitors, potentially an XSS vector.

Affected products

Published 2017-04-13. Last modified 2026-06-17.