Package Instance

Cross site scripting via HTML attributes in the back end
It is possible for untrusted users to inject malicious code into HTML attributes in the back end, which will be executed both in the element preview (back end) and on the website (front end).

Installations are only affected if there are untrusted back end users who have the rights to modify HTML fields (e.g. TinyMCE).

Cross site scripting in the system log
It is possible to inject code into the `tl_log` table that will be executed in the browser when the system log is called in the back end.

Duplicate Advisory: Contao allows admin an account to upload SVG file containing malicious JavaScript
## Duplicate Advisory

This advisory has been withdrawn because it is a duplicate of GHSA-vqqr-fgmh-f626. This link is maintained to preserve external references.

## Original Description

Contao 5.4.1 allows an authenticated admin account to upload a SVG file containing malicious javascript code into the target system. If the file is accessed through the website, it could lead to a Cross-Site Scripting (XSS) attack or execute arbitrary code via a crafted javascript to the target.

Improper Privilege Management
Contao is an open source CMS that allows creation of websites and scalable web applications.All users are advised to update to Contao As a workaround users may disable the form generator or disable the login for untrusted back end users.

Code Injection
Contao is an open source CMS that allows you to create websites and scalable web applications.Update to Contao to resolve. If you cannot update then disable the login for untrusted back end users.

Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
Contao before 4.4.52, 4.9.x before 4.9.6, and 4.10.x before 4.10.1 have Improper Input Validation. It is possible to inject insert tags in front end forms which will be replaced when the page is rendered.