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How the mentioned CVE works:
This vulnerability arises from insufficient output encoding in specific Contao templates. When user-controllable data is rendered using an affected template, the application fails to properly escape or sanitize the input before incorporating it into the final HTML page. This allows an attacker to craft a malicious payload containing JavaScript code. If a victim views a page containing this injected payload, the attacker’s script is executed in the victim’s browser within the context of the Contao application, potentially leading to session hijacking, defacement, or actions performed on behalf of the user.
Platform: Contao
Version: 4.0.0-4.13.56
Vulnerability: XSS
Severity: Low
date: 2025-11-25
Prediction: 2025-12-02
What Undercode Say:
`grep -r “unsafeHtml\\|html_.raw” templates/`
`./vendor/contao/core-bundle/contao/templates/twig/core/deprecated.html.twig: {{ content|raw }}`
`curl -s “http://target/page” | grep -o ‘‘`
How Exploit:
`http://target.com/page?input=`
`http://target.com/page?input=`
Protection from this CVE:
Update Contao version
Sanitize template outputs
Use Content Security Policy
Impact:
Session hijacking
Website defacement
Client-side attacks
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Sources:
Reported By: github.com
Extra Source Hub:
Undercode
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Free5GC, Denial of Service, CVE-2025-53032 (Moderate)