Medium severity5.4NVD Advisory· Published Mar 23, 2021· Updated Jun 17, 2026
CVE-2021-21370
CVE-2021-21370
Description
TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1 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. This is fixed in versions 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
typo3/cms-backendPackagist | >= 7.0.0, < 7.6.51 | 7.6.51 |
typo3/cms-backendPackagist | >= 8.0.0, < 8.7.40 | 8.7.40 |
typo3/cms-backendPackagist | >= 9.0.0, < 9.5.25 | 9.5.25 |
typo3/cms-backendPackagist | >= 10.0.0, < 10.4.14 | 10.4.14 |
typo3/cms-backendPackagist | >= 11.0.0, < 11.1.1 | 11.1.1 |
typo3/cms-corePackagist | >= 10.0.0, < 10.4.14 | 10.4.14 |
typo3/cms-corePackagist | >= 11.0.0, < 11.1.1 | 11.1.1 |
typo3/cms-corePackagist | >= 9.0.0, < 9.5.25 | 9.5.25 |
typo3/cmsPackagist | >= 10.0.0, < 10.4.14 | 10.4.14 |
typo3/cmsPackagist | >= 11.0.0, < 11.1.1 | 11.1.1 |
typo3/cmsPackagist | >= 9.0.0, < 9.5.25 | 9.5.25 |
Affected products
6- osv-coords4 versions
>= 7.0.0, < 7.6.51+ 3 more
- (no CPE)range: >= 7.0.0, < 7.6.51
- (no CPE)range: >= 10.0.0, < 10.4.14
- (no CPE)range: >= 7.0.0, < 7.6.51
- (no CPE)range: >= 10.0.0, < 10.4.14
Patches
Vulnerability mechanics
References
7- github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-x7hc-x7fm-f7qhnvdThird Party AdvisoryWEB
- github.com/advisories/GHSA-x7hc-x7fm-f7qhghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2021-21370ghsaADVISORY
- packagist.org/packages/typo3/cms-backendnvdRelease NotesThird Party AdvisoryWEB
- typo3.org/security/advisory/typo3-core-sa-2021-008nvdVendor AdvisoryWEB
- github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2021-21370.yamlghsaWEB
- github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2021-21370.yamlghsaWEB
News mentions
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