MediumGHSA-x7hc-x7fm-f7qhBIT-typo3-2021-21370CVE-2021-21370

Cross-Site Scripting in Content Preview (CType menu)

Published 23 Mar 2021 · Updated 8 Jul 2026

Affected packages

typo3/cms-backendComposer

Affected: >=7.0.0 <7.6.51
Fixed in: 7.6.51

Update to the fixed version for your release line, for example:composer require typo3/cms-backend:^7.6.51

typo3/cms-backendComposer

Affected: >=8.0.0 <8.7.40
Fixed in: 8.7.40

Update to the fixed version for your release line, for example:composer require typo3/cms-backend:^8.7.40

typo3/cms-backendComposer

Affected: >=9.0.0 <9.5.25
Fixed in: 9.5.25

Update to the fixed version for your release line, for example:composer require typo3/cms-backend:^9.5.25

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/cms-coreComposer

Affected: >=9.0.0 <9.5.25
Fixed in: 9.5.25

Update to the fixed version for your release line, for example:composer require typo3/cms-core:^9.5.25

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

typo3/cmsComposer

Affected: >=9.0.0 <9.5.25
Fixed in: 9.5.25

Update to the fixed version for your release line, for example:composer require typo3/cms:^9.5.25

Details

Problem

It has been discovered that content elements of type _menu_ are vulnerable to cross-site scripting when their referenced items get previewed in the page module. A valid backend user account is needed to exploit this vulnerability.

Solution

Update to TYPO3 versions 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1 that fix the problem described.

Credits

Thanks to TYPO3 contributor Oliver Bartsch who reported and fixed the issue.

References

TYPO3-CORE-SA-2021-008

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References

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