CVE-2021-21340: Cross-Site Scripting in Content Preview
First published: Tue Mar 16 2021(Updated: )
### 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)
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| composer/typo3/cms-core | >=10.0.0<10.4.14>=11.0.0<11.1.1 | |
| composer/typo3/cms | >=10.0.0<10.4.14>=11.0.0<11.1.1 | |
| Typo3 Typo3 | >=10.0.0<10.4.14 | |
| Typo3 Typo3 | >=11.0.0<11.1.1 | |
| composer/typo3/cms | >=11.0.0<11.1.1 | 11.1.1 |
| composer/typo3/cms | >=10.0.0<10.4.14 | 10.4.14 |
| composer/typo3/cms-core | >=11.0.0<11.1.1 | 11.1.1 |
| composer/typo3/cms-core | >=10.0.0<10.4.14 | 10.4.14 |
| composer/typo3/cms-backend | >=11.0.0<=11.1.0 | 11.1.1 |
| composer/typo3/cms-backend | >=10.0.0<=10.4.13 | 10.4.14 |
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Reference Links
- https://typo3.org/security/advisory/typo3-core-sa-2021-007
- https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-fjh3-g8gq-9q92
- https://packagist.org/packages/typo3/cms-backend
- https://nvd.nist.gov/vuln/detail/CVE-2021-21340
- https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2021-21340.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2021-21340.yaml
- https://github.com/advisories/GHSA-fjh3-g8gq-9q92 (Advisory)
Frequently Asked Questions
What is TYPO3-CORE-SA-2021-007?
TYPO3-CORE-SA-2021-007 is a vulnerability related to Cross-Site Scripting (XSS) in the Content Preview feature of TYPO3 CMS.
Which versions of TYPO3 CMS are affected by TYPO3-CORE-SA-2021-007?
TYPO3 CMS versions 10.0.0 to 10.4.14 and versions 11.0.0 to 11.1.1 are affected by TYPO3-CORE-SA-2021-007.
What is the severity of TYPO3-CORE-SA-2021-007?
The severity of TYPO3-CORE-SA-2021-007 is medium.
How can I fix TYPO3-CORE-SA-2021-007?
To fix TYPO3-CORE-SA-2021-007, you should update TYPO3 CMS to a version that includes the necessary security patches.
Where can I find more information about TYPO3-CORE-SA-2021-007?
You can find more information about TYPO3-CORE-SA-2021-007 on the TYPO3 security advisory page: https://typo3.org/security/advisory/typo3-core-sa-2021-007.
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