A host header attack vulnerability exists in FUEL CMS 1.5.0 through fuel/modules/fuel/config/fuel_constants.php and fuel/modules/fuel/libraries/Asset.php. An attacker can use a man in the middle attack such as phishing.
In FUEL CMS 11.4.12 and before, the page preview feature allows an anonymous user to take complete ownership of any account including an administrator one.
FUEL CMS 1.4.4 has XSS in the Create Blocks section of the Admin console. This could lead to cookie stealing and other malicious actions. This vulnerability can be exploited with an authenticated account but can also impact unauthenticated visitors.
FUEL CMS 1.4.4 has CSRF in the blocks/create/ Create Blocks section of the Admin console. This could lead to an attacker tricking the administrator into executing arbitrary code via a specially crafted HTML page.
XSS exists in FUEL CMS 1.4.3 via the Header or Body in the Layout Variables during new-page creation, as demonstrated by the pages/edit/1?lang=english URI.
XSS exists in FUEL CMS 1.4.3 via the Page title, Meta description, or Meta keywords during page data management, as demonstrated by the pages/edit/1?lang=english URI.