- Component Type: TYPO3 CMS
- Subcomponent: Fluid (ext:fluid)
- Release Date: November 17, 2020
- Vulnerability Type: Cross-Site Scripting
- Affected Versions: 10.0.0-10.4.9, 9.0.0-9.5.22, 8.7.0-8.7.37 ELTS, 7.6.0-7.6.47 ELTS, 6.2.0-6.2.53 ELTS
- Severity: Medium
- Suggested CVSS: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:F/RL:O/RC:C
- References: CVE-2020-26227, CWE-79
Problem Description
It has been discovered that system extension Fluid (typo3/cms-fluid) of the TYPO3 core is vulnerable to cross-site scripting passing user-controlled data as argument to Fluid view helpers.
<f:form ... fieldNamePrefix=”{payload}” />
<f:be.labels.csh ... label=”{payload}” />
<f:be.menus.actionMenu ... label=”{payload}” />
Solution
Update to TYPO3 versions 10.4.10, 9.5.23, 8.7.38 ELTS, 7.6.48 ELTS or 6.2.54 ELTS ELTS that fix the problem described.
Credits
Thanks to TYPO3 security team member Oliver Hader who reported this issue and to TYPO3 security team members Helmut Hummel & Oliver Hader 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.