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Vulnerability record · CVE-2021-37626 · published 11 August 2021

CVE-2021-37626: Contao code injection vulnerability

Contao · Contao

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.

7.2 CVSS 3.1 High EPSS 1.3% · top 31.7% CWE-94 · Code injection
7.2CVSS 3.1 base score, v2 6.5
1.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-37626), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.