CVE-2021-21370: XSS
First published: Tue Mar 16 2021(Updated: )
### 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](https://typo3.org/security/advisory/typo3-core-sa-2021-008)
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| composer/typo3/cms | >=10.0.0<10.4.14>=11.0.0<11.1.1>=9.0.0<9.5.25 | |
| composer/typo3/cms-core | >=10.0.0<10.4.14>=11.0.0<11.1.1>=9.0.0<9.5.25 | |
| Typo3 Typo3 | >=7.0.0<7.6.51 | |
| Typo3 Typo3 | >=8.0.0<8.7.40 | |
| Typo3 Typo3 | >=9.0.0<9.5.25 | |
| Typo3 Typo3 | >=10.0.0<10.4.14 | |
| Typo3 Typo3 | >=11.0.0<11.1.1 | |
| composer/typo3/cms | >=9.0.0<9.5.25 | 9.5.25 |
| 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 | >=9.0.0<9.5.25 | 9.5.25 |
| 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 |
| composer/typo3/cms-backend | >=9.0.0<=9.5.24 | 9.5.25 |
| composer/typo3/cms-backend | >=8.0.0<=8.7.39 | 8.7.40 |
| composer/typo3/cms-backend | >=7.0.0<=7.6.50 | 7.6.51 |
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Reference Links
- https://typo3.org/security/advisory/typo3-core-sa-2021-008
- https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-x7hc-x7fm-f7qh
- https://packagist.org/packages/typo3/cms-backend
- https://nvd.nist.gov/vuln/detail/CVE-2021-21370
- https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2021-21370.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2021-21370.yaml
- https://github.com/advisories/GHSA-x7hc-x7fm-f7qh (Advisory)
Frequently Asked Questions
What is CVE-2021-21370?
CVE-2021-21370 is a vulnerability in TYPO3 CMS that allows for cross-site scripting (XSS) attacks in the content preview feature.
How does CVE-2021-21370 impact TYPO3 CMS?
CVE-2021-21370 can potentially allow an attacker to execute arbitrary JavaScript code in the context of a victim's web browser, leading to potential information theft or unauthorized actions.
Which versions of TYPO3 CMS are affected by CVE-2021-21370?
TYPO3 CMS versions 10.0.0 to 10.4.14, 11.0.0 to 11.1.1, and 9.0.0 to 9.5.25 are affected by CVE-2021-21370.
How can I fix CVE-2021-21370 in TYPO3 CMS?
To fix CVE-2021-21370, update TYPO3 CMS to versions 10.4.15, 11.1.2, or 9.5.26 or later, as these versions contain the necessary security patches.
Where can I find more information about CVE-2021-21370?
More information about CVE-2021-21370 can be found in the TYPO3 security advisory TYPO3-CORE-SA-2021-008 (https://typo3.org/security/advisory/typo3-core-sa-2021-008).
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