CVE-2021-21340
Cross-Site Scripting in Content Preview
5.4
MEDIUM
CVSS 3.1
EPSS 0.87%
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 .
How to fix CVE-2021-21340
To remediate CVE-2021-21340, upgrade the affected package to a fixed version below.
- —upgrade to 10.4.14 or later
- —upgrade to 10.4.14 or later
- —upgrade to 10.4.14 or later
Is CVE-2021-21340 being exploited?
Low — EPSS is 0.9%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- >= 10.0.0, < 10.4.14
- >= 10.0.0, < 10.4.14
- >= 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 |