CVE-2021-21340
MEDIUM5.4EPSS 0.38%Cross-Site Scripting in Content Preview
Published: 3/23/2021Modified: 3/13/2026
Description
### 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 * [TYPO3-CORE-SA-2021-007](https://typo3.org/security/advisory/typo3-core-sa-2021-007)
Affected packages (4)
- Bitnami/typo3>= 10.0.0, < 10.4.14, >= 11.0.0, < 11.1.1
- Packagist/typo3/cms>= 10.0.0, < 10.4.14
- Packagist/typo3/cms-backend>= 10.0.0, < 10.4.14
- Packagist/typo3/cms-core>= 10.0.0, < 10.4.14
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
References (6)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2021-21340
- WEBhttps://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2021-21340.yaml
- WEBhttps://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2021-21340.yaml
- WEBhttps://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-fjh3-g8gq-9q92
- WEBhttps://packagist.org/packages/typo3/cms-backend
- WEBhttps://typo3.org/security/advisory/typo3-core-sa-2021-007