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Vulnerability record · CVE-2021-37627 · published 11 August 2021

CVE-2021-37627: Contao improper privilege management vulnerability

Contao · Contao

Contao is an open source CMS that allows creation of websites and scalable web applications. In affected versions it is possible to gain privileged rights in the Contao back end. Installations are only affected if they have untrusted back end users who have access to the form generator. All users are advised to update to Contao 4.4.56, 4.9.18 or 4.11.7. As a workaround users may disable the form generator or disable the login for untrusted back end users.

7.2 CVSS 3.1 High EPSS 1.0% · top 37.9% CWE-269 · Improper privilege management
7.2CVSS 3.1 base score, v2 6.5
1.0%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 creation of websites and scalable web applications. In affected versions it is possible to gain privileged rights in the Contao back end. Installations are only affected if they have untrusted back end users who have access to the form generator. All users are advised to update to Contao 4.4.56, 4.9.18 or 4.11.7. As a workaround users may disable the form generator or 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/privilege-escalation-with-the-form-generator.html Vendor Advisory
https://github.com/contao/contao/security/advisories/GHSA-hq5m-mqmx-fw6m Third Party Advisory
https://contao.org/en/security-advisories/privilege-escalation-with-the-form-generator.html Vendor Advisory
https://github.com/contao/contao/security/advisories/GHSA-hq5m-mqmx-fw6m Third Party Advisory

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

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Source: NIST National Vulnerability Database (record CVE-2021-37627), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.