CVE-2021-21340

Cross-Site Scripting in Content Preview

Description

TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 10.4.14, 11.1.1 it has been discovered that database fields used as _descriptionColumn_ are vulnerable to cross-site scripting when their content gets previewed. A valid backend user account is needed to exploit this vulnerability. This is fixed in versions 10.4.14, 11.1.1 .

Category

5.4
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.45%
Vendor Advisory typo3.org
Affected: TYPO3 TYPO3.CMS
Published at:
Updated at:

References

Link Tags
https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-fjh3-g8gq-9q92 third party advisory
https://packagist.org/packages/typo3/cms-backend third party advisory release notes
https://typo3.org/security/advisory/typo3-core-sa-2021-007 vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-21340?
CVE-2021-21340 has been scored as a medium severity vulnerability.
How to fix CVE-2021-21340?
To fix CVE-2021-21340, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-21340 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-21340 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-21340?
CVE-2021-21340 affects TYPO3 TYPO3.CMS.
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