- Component Type: TYPO3 CMS
- Subcomponent: Backend Grid View (ext:backend)
- Release Date: July 20, 2021
- Vulnerability Type: Cross-Site Scripting
- Affected Versions: 8.0.0-8.7.40 ELTS, 9.0.0-9.5.27, 10.0.0-10.4.17, 11.0.0-11.3.0
- 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
- References: CVE-2021-32669, CWE-79
Problem Description
Failing to properly encode settings for backend layouts, the corresponding grid view is vulnerable to persistent cross-site scripting. A valid backend user account is needed to exploit this vulnerability.
Solution
Update to TYPO3 versions 8.7.41 ELTS, 9.5.28, 10.4.18, 11.3.1 that fix the problem described.
Credits
Thanks to TYPO3 core merger Oliver Bartsch who reported and 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.