What’s Vulnerable › Vulnerabilities

CVE-2021-37626: PHP file inclusion via insert tags

• Severity: high (CVSS 7.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-08-11 · updated 2026-06-17
• Weakness: CWE-94

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.

Affected products

• contao: from 4.4.0 before 4.4.56; from 4.9.0 before 4.9.18; from 4.11.0 before 4.11.7; 4.0.0, 4.1.0, 4.2.0, 4.3.0, 4.5.0, 4.6.0 (+3) — fixed in 4.11.7, 4.4.56, 4.9.18

How to fix

Upgrade to a fixed version: contao 4.11.7, 4.4.56, 4.9.18. Check the vendor advisory for mitigations.

References

• https://contao.org/en/security-advisories/php-file-inclusion-via-insert-tags.html
• https://github.com/contao/contao/security/advisories/GHSA-r6mv-ppjc-4hgr
• https://contao.org/en/security-advisories/php-file-inclusion-via-insert-tags.html
• https://github.com/contao/contao/security/advisories/GHSA-r6mv-ppjc-4hgr

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