CVE-2024-28234 Contao has insufficient BBCode sanitizer

What is CVE-2024-28234?

CVE-2024-28234 is a medium-severity cross-site scripting vulnerability in contao, published on 9 Apr 2024. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Contao is an open source content management system. Starting in version 2.0.0 and prior to versions 4.13.40 and 5.3.4, it is possible to inject CSS styles via BBCode in comments. Installations are only affected if BBCode is enabled. Contao versions 4.13.40 and 5.3.4 have a patch for this issue. As a workaround, disable BBCode for comments.

Weakness: CWE-74

Which versions are affected by CVE-2024-28234?

4 open source packages ship an affected version, including contao/comments-bundle. It affects 1 product.

Products include Contao Contao.

How do I fix CVE-2024-28234?

Upgrade contao/comments-bundle to a fixed version for your release line: 4.13.40 or 5.3.4.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2024-28234 being exploited?

There is no known exploitation of CVE-2024-28234 in the wild and no public exploit code.

Other vulnerabilities in contao

• CVE-2022-26265 Remote Code Execution in Contao Managed Edition Critical 9.8
• CVE-2019-11512 Contao SQL injection in the file manager Critical 9.8
• CVE-2012-4383 Contao core SQL Injection Vulnerability High 8.8
• CVE-2019-19745 Unrestricted file uploads in Contao High 8.8
• CVE-2024-28235 Contao possible cookie sharing with external domains while checking protected pages for broken links High 8.4

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-j55w-hjpj-825g.