Here you will find a list of vulnerabilities that have already been found and fixed in Contao.
Invalidating opt-in tokens
CVE ID: CVE-2019-10643
Security researcher Ali Razzaq has discovered that confirming an opt-in token does not invalidate previous opt-in tokens in Contao 4.7.
Contao 4.7 up to 4.7.2
Update to Contao 4.7.3.
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If you think that you have found a security issue in Contao, please report it according to our security policy.