CVE-2021-37626 PHP file inclusion via insert tags

What is CVE-2021-37626?

CVE-2021-37626 is a high-severity code injection vulnerability in contao, published on 11 Aug 2021. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

Contao is an open source CMS that allows you to create websites and scalable web applications. In affected versions it is possible to load PHP files by entering insert tags in the Contao back end. Installations are only affected if they have untrusted back end users who have the rights to modify fields that are shown in the front end. Update to Contao 4.4.56, 4.9.18 or 4.11.7 to resolve. If you cannot update then disable the login for untrusted back end users.

Weakness: CWE-94

Which versions are affected by CVE-2021-37626?

12 open source packages ship an affected version, including contao/contao and contao/core-bundle. It affects 1 product.

Products include Contao Contao.

How do I fix CVE-2021-37626?

Upgrade contao/contao to a fixed version for your release line: 4.4.56, 4.11.7 or 4.9.18.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2021-37626 being exploited?

There is no known exploitation of CVE-2021-37626 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-r6mv-ppjc-4hgr.