Here you will find a list of vulnerabilities that have already been found and fixed in Contao. If you think that you have found a security issue in Contao, please report it according to our security policy.
Cross site scripting via canonical URL
by Leo Feyer
CVE ID: CVE-2022-24899
Untrusted users can inject malicious code into the canonical tag, which is then executed on the web page (front end).
Contao 4.13 up to 4.13.2
Update to Contao 4.13.3.
Disable canonical tags in the root page settings.