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CVE-2021-37626

PHP file inclusion via insert tags

7.2 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
High
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

1.25%Up 0.6 points since Aug 12, 2021
90%50%10%1%

What each source reports

CVE List Score used 7.2

PHP file inclusion via insert tags

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.

Record
CVE-2021-37626
CVSS 3.1
7.2 HighCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-94
Updated
2026-11-02
EUVDEUVD-2021-1860 7.2

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.

Record
EUVD-2021-1860
CVSS 3.1
7.2 HighCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-03
GitHub AdvisoriesGHSA-r6mv-ppjc-4hgr 6.7

PHP file inclusion via insert tags

Impact

It is possible for untrusted users to load arbitrary PHP files via insert tags.

Installations are only affected if there are untrusted back end users.

Patches

Update to Contao 4.4.56, 4.9.18 or 4.11.7.

Workarounds

Disable the login for untrusted back end users.

References

https://contao.org/en/security-advisories/php-file-inclusion-via-insert-tags

For more information

If you have any questions or comments about this advisory, open an issue in contao/contao.

Record
GHSA-r6mv-ppjc-4hgr
CVSS 3.1
6.7 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L
Weakness
CWE-94
Updated
2026-11-02
NVD 7.2

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.

Record
CVE-2021-37626
CVSS 3.1
7.2 HighCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0
6.5 MediumAV:N/AC:L/Au:S/C:P/I:P/A:P
Weakness
CWE-94
Updated
2026-11-02
OSV 7.2

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.

Record
CVE-2021-37626
CVSS 3.1
7.2 HighCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVGHSA-r6mv-ppjc-4hgr 6.7

PHP file inclusion via insert tags

Impact

It is possible for untrusted users to load arbitrary PHP files via insert tags.

Installations are only affected if there are untrusted back end users.

Patches

Update to Contao 4.4.56, 4.9.18 or 4.11.7.

Workarounds

Disable the login for untrusted back end users.

References

https://contao.org/en/security-advisories/php-file-inclusion-via-insert-tags

For more information

If you have any questions or comments about this advisory, open an issue in contao/contao.

Record
GHSA-r6mv-ppjc-4hgr
CVSS 3.1
6.7 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L
Weakness
CWE-94
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
contao/core-bundle
Packagist
 4.0.0 up to 4.4.56
4.4.56
contao/core-bundle
Packagist
 4.5.0 up to 4.9.18
4.9.18
contao/core-bundle
Packagist
 4.10.0 up to 4.11.7
4.11.7
contao/contao
Packagist
 4.0.0 up to 4.4.56
4.4.56
contao/contao
Packagist
 4.5.0 up to 4.9.18
4.9.18
contao/contao
Packagist
 4.10.0 up to 4.11.7
4.11.7
contao/core-bundle
Packagist
 4.0.0 up to 4.4.56, plus listed versions
4.0.14.0.24.0.34.0.44.1.0
Show 45 moreShow less
4.1.0-RC14.1.0-beta14.1.14.1.24.1.34.2.04.2.0-RC14.2.0-beta14.2.14.2.24.2.34.2.44.2.54.3.04.3.0-RC14.3.14.3.104.3.114.3.24.3.34.3.44.3.54.3.64.3.74.3.84.3.94.4.04.4.0-RC14.4.0-RC24.4.0-beta14.4.14.4.104.4.114.4.124.4.134.4.144.4.154.4.164.4.174.4.184.4.194.4.24.4.204.4.214.4.22
4.4.56
contao/core-bundle
Packagist
 4.5.0 up to 4.9.18, plus listed versions
4.5.14.5.104.5.114.5.124.5.13
Show 45 moreShow less
4.5.144.5.24.5.34.5.44.5.54.5.64.5.74.5.84.5.94.6.04.6.0-RC14.6.0-RC24.6.0-RC34.6.14.6.104.6.114.6.124.6.134.6.144.6.24.6.34.6.44.6.54.6.64.6.74.6.84.6.94.7.04.7.0-RC14.7.0-RC24.7.0-RC34.7.0-RC44.7.14.7.24.7.34.7.44.7.54.7.64.7.74.8.04.8.0-RC14.8.0-RC24.8.14.8.24.8.3
4.9.18
contao/core-bundle
Packagist
 4.10.0 up to 4.11.7, plus listed versions
4.10.14.10.24.10.34.10.44.10.5
Show 11 moreShow less
4.10.64.10.74.11.04.11.0-RC14.11.0-RC24.11.14.11.24.11.34.11.44.11.54.11.6
4.11.7
contao/contao
Packagist
 4.0.0 up to 4.4.56, plus listed versions
4.4.224.4.234.4.244.4.254.4.26
Show 29 moreShow less
4.4.274.4.284.4.294.4.304.4.314.4.324.4.334.4.344.4.354.4.364.4.374.4.384.4.394.4.404.4.414.4.424.4.434.4.444.4.454.4.464.4.474.4.484.4.494.4.504.4.514.4.524.4.534.4.544.4.55
4.4.56
contao/contao
Packagist
 4.5.0 up to 4.9.18, plus listed versions
4.5.134.5.144.6.04.6.14.6.10
Show 45 moreShow less
4.6.114.6.124.6.134.6.144.6.24.6.34.6.44.6.54.6.64.6.74.6.84.6.94.7.04.7.0-RC14.7.0-RC24.7.0-RC34.7.0-RC44.7.14.7.24.7.34.7.44.7.54.7.64.7.74.8.04.8.0-RC14.8.0-RC24.8.14.8.24.8.34.8.44.8.54.8.64.8.74.8.84.9.04.9.0-RC14.9.0-RC24.9.14.9.104.9.114.9.124.9.134.9.144.9.15
4.9.18
contao/contao
Packagist
 4.10.0 up to 4.11.7, plus listed versions
4.10.14.10.24.10.34.10.44.10.5
Show 11 moreShow less
4.10.64.10.74.11.04.11.0-RC14.11.0-RC24.11.14.11.24.11.34.11.44.11.54.11.6
4.11.7

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-37626 is a high vulnerability (CVSS 7.2) in Contao, published August 11, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.25%, the 69th percentile. Fixed in contao/core-bundle 4.4.56.

References

This page doesn't list everything

Left out here: 75 versions. The JSON record has them.

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