CVE-2020-26227: Cross-Site Scripting in Fluid view helpers
### Meta 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 (5.7) CWE-79
Problem 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 9.5.23 or 10.4.10 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.
References TYPO3-CORE-SA-2020-010
Other sources
TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 9.5.23 and 10.4.10 the 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. Update to TYPO3 versions 9.5.23 or 10.4.10 that fix the problem described.
TYPO3-CORE-SA-2020-010: Cross-Site Scripting in Fluid view helpers
Affected Software
Event History
Frequently Asked Questions
What is TYPO3-CORE-SA-2020-010?
TYPO3-CORE-SA-2020-010 is a vulnerability in TYPO3 that allows for Cross-Site Scripting (XSS) attacks in Fluid view helpers.
What is the severity of CVE-2020-26227?
The severity of CVE-2020-26227 is moderate.
Which versions of TYPO3 are affected by TYPO3-CORE-SA-2020-010?
TYPO3 versions 8.7.0 to 8.7.38, 9.0.0 to 9.5.23, and 10.0.0 to 10.4.10 are affected by TYPO3-CORE-SA-2020-010.
How can I fix TYPO3-CORE-SA-2020-010?
To fix TYPO3-CORE-SA-2020-010, you should update TYPO3 to a version that includes the security patch provided by TYPO3.
Where can I find more information about TYPO3-CORE-SA-2020-010?
You can find more information about TYPO3-CORE-SA-2020-010 on the TYPO3 website at https://typo3.org/security/advisory/typo3-core-sa-2020-010.