CVE-2021-21358

Description

### Problem It has been discovered that the Form Designer backend module of the Form Framework is vulnerable to cross-site scripting. A valid backend user account with access to the form module is needed to exploit this vulnerability. ### Solution Update to TYPO3 versions 10.4.14 or 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-2021-004](https://typo3.org/security/advisory/typo3-core-sa-2021-004)

How to fix CVE-2021-21358

To remediate CVE-2021-21358, 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
• —upgrade to 10.4.14 or later

Is CVE-2021-21358 being exploited?

Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.

Affected packages (4)

• >= 10.2.0, < 10.4.14, >= 11.0.0, < 11.1.1
• >= 10.0.0, < 10.4.14
• >= 10.0.0, < 10.4.14
• >= 10.2.0, < 10.4.14

CVSS scores

References (6)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-21358
• WEBgithub.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms-core/CVE-2021-21358.yaml
• WEBgithub.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2021-21358.yaml
• WEBgithub.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-x79j-wgqv-g8h2