Security advisories

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.

Insert tag injection in forms

by Leo Feyer

Date: 2020-09-24
CVE ID: CVE-2020-25768


It is possible to inject insert tags in front end forms which will be replaced when the page is rendered.

Affected versions

Contao 4.0
Contao 4.1
Contao 4.2
Contao 4.3
Contao 4.4 up to 4.4.51
Contao 4.5
Contao 4.6
Contao 4.7
Contao 4.8
Contao 4.9 up to 4.9.5
Contao 4.10 up to 4.10.0

Suggested solution

Update to Contao 4.4.52, 4.9.6 or 4.10.1.


Disable the front end login form and do not use form fields with array keys such as fieldname[].

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