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CVE-2024-28191

Contao may have unencoded insert tags in the frontend

3.1 LowFix available

Contao is an open source content management system. Starting in version 4.0.0 and prior to version 4.13.40 and 5.3.4, it is possible to inject insert tags in frontend forms if the output is structured in a very specific way. Contao versions 4.13.40 and 5.3.4 have a patch for this issue. As a workaround, do not output user data from frontend forms next to each other, always separate them by at least one character.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
None
Availability
None

Exploit likelihood

0.50%Up 0.5 points since Apr 10, 2024
90%50%10%1%

What each source reports

CVE List Score used 3.1

Contao may have unencoded insert tags in the frontend

Contao is an open source content management system. Starting in version 4.0.0 and prior to version 4.13.40 and 5.3.4, it is possible to inject insert tags in frontend forms if the output is structured in a very specific way. Contao versions 4.13.40 and 5.3.4 have a patch for this issue. As a workaround, do not output user data from frontend forms next to each other, always separate them by at least one character.

Record
CVE-2024-28191
CVSS 3.1
3.1 LowCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness
CWE-74
Updated
2026-11-02
EUVDEUVD-2024-1135 3.1

Contao is an open source content management system. Starting in version 4.0.0 and prior to version 4.13.40 and 5.3.4, it is possible to inject insert tags in frontend forms if the output is structured in a very specific way. Contao versions 4.13.40 and 5.3.4 have a patch for this issue. As a workaround, do not output user data from frontend forms next to each other, always separate them by at least one character.

Record
EUVD-2024-1135
CVSS 3.1
3.1 LowCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
Updated
2026-11-03
GitHub AdvisoriesGHSA-747v-52c4-8vj8 3.1

Contao: Unencoded insert tags in the frontend

Impact

It is possible to inject insert tags via the form generator if the submitted form data is output on the page in a specific way.

Patches

Update to Contao 4.13.40 or 5.3.4.

Workarounds

Do not output the submitted form data on the website.

References

https://contao.org/en/security-advisories/insert-tag-injection-via-the-form-generator

For more information

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

Record
GHSA-747v-52c4-8vj8
CVSS 3.1
3.1 LowCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness
CWE-74
Updated
2026-11-02
NVD 3.1

Contao is an open source content management system. Starting in version 4.0.0 and prior to version 4.13.40 and 5.3.4, it is possible to inject insert tags in frontend forms if the output is structured in a very specific way. Contao versions 4.13.40 and 5.3.4 have a patch for this issue. As a workaround, do not output user data from frontend forms next to each other, always separate them by at least one character.

Record
CVE-2024-28191
CVSS 3.1
3.1 LowCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-74
Updated
2026-11-02
OSV 3.1

Contao may have unencoded insert tags in the frontend

Contao is an open source content management system. Starting in version 4.0.0 and prior to version 4.13.40 and 5.3.4, it is possible to inject insert tags in frontend forms if the output is structured in a very specific way. Contao versions 4.13.40 and 5.3.4 have a patch for this issue. As a workaround, do not output user data from frontend forms next to each other, always separate them by at least one character.

Record
CVE-2024-28191
CVSS 3.1
3.1 LowCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness
CWE-74
Updated
2026-11-02
OSVGHSA-747v-52c4-8vj8 3.1

Contao: Unencoded insert tags in the frontend

Impact

It is possible to inject insert tags via the form generator if the submitted form data is output on the page in a specific way.

Patches

Update to Contao 4.13.40 or 5.3.4.

Workarounds

Do not output the submitted form data on the website.

References

https://contao.org/en/security-advisories/insert-tag-injection-via-the-form-generator

For more information

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

Record
GHSA-747v-52c4-8vj8
CVSS 3.1
3.1 LowCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness
CWE-74
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
contao/core-bundle
Packagist
 4.0.0 up to 4.13.40
4.13.40
contao/core-bundle
Packagist
 5.0.0-RC1 up to 5.3.4
5.3.4
contao/core-bundle
Packagist
 4.0.0 up to 4.13.40, plus listed versions
4.0.14.0.24.0.34.0.44.1.0
Show 45 moreShow less
4.1.0-RC14.1.0-beta14.1.14.1.24.1.34.10.04.10.0-RC14.10.0-RC24.10.0-RC34.10.0-RC44.10.14.10.24.10.34.10.44.10.54.10.64.10.74.11.04.11.0-RC14.11.0-RC24.11.14.11.24.11.34.11.44.11.54.11.64.11.74.11.84.11.94.12.04.12.0-RC14.12.0-RC24.12.0-RC34.12.14.12.24.12.34.12.44.12.54.12.64.12.74.13.04.13.0-RC14.13.0-RC24.13.0-RC34.13.1
4.13.40
contao/core-bundle
Packagist
 5.0.0-RC1 up to 5.3.4, plus listed versions
5.0.05.0.0-RC25.0.0-RC35.0.0-RC45.0.1
Show 45 moreShow less
5.0.105.0.25.0.35.0.45.0.55.0.65.0.75.0.85.0.95.1.05.1.0-RC15.1.0-RC25.1.0-RC35.1.15.1.105.1.115.1.25.1.35.1.45.1.55.1.65.1.75.1.85.1.95.2.05.2.0-RC15.2.0-RC25.2.0-RC35.2.0-RC45.2.0-RC55.2.0-RC65.2.15.2.105.2.25.2.35.2.45.2.55.2.65.2.75.2.85.2.95.3.05.3.0-RC15.3.0-RC25.3.0-RC3
5.3.4

History

History
RecordedChangedSources
aliases, publishedEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

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

In short

CVE-2024-28191 is a low vulnerability (CVSS 3.1) in Contao, published April 9, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.50%, the 42nd percentile. Fixed in contao/core-bundle 4.13.40.

References

This page doesn't list everything

Left out here: 230 versions. The JSON record has them.

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