• Component Type: TYPO3 CMS
• Subcomponent: Form Framework (ext:form)
• Release Date: March 16, 2021
• Vulnerability Type: Cross-Site Scripting
• Affected Versions: 10.2.0-10.4.13, 11.0.0-11.1.0
• Severity: Medium
• Suggested CVSS: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:F/RL:O/RC:C
• References: CVE-2021-21358, CWE-79

Problem Description

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.

General Advice

Follow the recommendations that are given in the TYPO3 Security Guide. Please subscribe to the typo3-announce mailing list.

General Note

All security related code changes are tagged so that you can easily look them up in our review system.