MediumGHSA-vqqx-jw6p-q3rfBIT-typo3-2020-26227CVE-2020-26227

Cross-Site Scripting in Fluid view helpers

Published 21 Dec 2020 · Updated 10 Sept 2026

Affected packages

typo3/cms-coreComposer
Affected
>=9.0.0 <9.5.23
Fixed in
9.5.23
Update to the fixed version for your release line, for example:composer require typo3/cms-core:^9.5.23
typo3/cms-coreComposer
Affected
>=10.0.0 <10.4.10
Fixed in
10.4.10
Update to the fixed version for your release line, for example:composer require typo3/cms-core:^10.4.10
typo3/cms-coreComposer
Affected
>=8.7.0 <8.7.38
Fixed in
8.7.38
Update to the fixed version for your release line, for example:composer require typo3/cms-core:^8.7.38
typo3/cmsComposer
Affected
>=10.0.0 <10.4.10
Fixed in
10.4.10
Update to the fixed version for your release line, for example:composer require typo3/cms:^10.4.10
typo3/cmsComposer
Affected
>=9.0.0 <9.5.23
Fixed in
9.5.23
Update to the fixed version for your release line, for example:composer require typo3/cms:^9.5.23
typo3/cmsComposer
Affected
>=8.7.0 <8.7.38
Fixed in
8.7.38
Update to the fixed version for your release line, for example:composer require typo3/cms:^8.7.38

Details

> ### Meta > * CVSS: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:F/RL:O/RC:C (5.7) > * CWE-79

Problem

It has been discovered that system extension Fluid (typo3/cms-fluid) of the TYPO3 core is vulnerable to cross-site scripting passing user-controlled data as argument to Fluid view helpers.

<f:form ... fieldNamePrefix="{payload}" />
<f:be.labels.csh ... label="{payload}" />
<f:be.menus.actionMenu ... label="{payload}" />

Solution

Update to TYPO3 versions 9.5.23 or 10.4.10 that fix the problem described.

Credits

Thanks to TYPO3 security team member Oliver Hader who reported this issue and to TYPO3 security team members Helmut Hummel & Oliver Hader who fixed the issue.

References

Is GHSA-vqqx-jw6p-q3rf in any of your client repos?

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References

Advisory data from OSV.dev (opens OSV.dev in a new tab), refreshed daily.