MediumGHSA-fjh3-g8gq-9q92BIT-typo3-2021-21340CVE-2021-21340

Cross-Site Scripting in Content Preview

Published 23 Mar 2021 · Updated 8 Jul 2026

Affected packages

typo3/cms-backendComposer
Affected
>=10.0.0 <10.4.14
Fixed in
10.4.14
Update to the fixed version for your release line, for example:composer require typo3/cms-backend:^10.4.14
typo3/cms-backendComposer
Affected
>=11.0.0 <11.1.1
Fixed in
11.1.1
Update to the fixed version for your release line, for example:composer require typo3/cms-backend:^11.1.1
typo3/cms-coreComposer
Affected
>=10.0.0 <10.4.14
Fixed in
10.4.14
Update to the fixed version for your release line, for example:composer require typo3/cms-core:^10.4.14
typo3/cms-coreComposer
Affected
>=11.0.0 <11.1.1
Fixed in
11.1.1
Update to the fixed version for your release line, for example:composer require typo3/cms-core:^11.1.1
typo3/cmsComposer
Affected
>=10.0.0 <10.4.14
Fixed in
10.4.14
Update to the fixed version for your release line, for example:composer require typo3/cms:^10.4.14
typo3/cmsComposer
Affected
>=11.0.0 <11.1.1
Fixed in
11.1.1
Update to the fixed version for your release line, for example:composer require typo3/cms:^11.1.1

Details

Problem

It has been discovered that database fields used as _descriptionColumn_ are vulnerable to cross-site scripting when their content gets previewed in the page module. A valid backend user account is needed to exploit this vulnerability.

Solution

Update to TYPO3 versions 10.4.14, 11.1.1 that fix the problem described.

Credits

Thanks to Richie Lee who reported this issue and to TYPO3 framework merger Andreas Fernandez who fixed the issue.

References

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References

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