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Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')


Severity Medium
Score 5.4/10


TYPO3 is an open-source web content management system. In TYPO3, user-submitted content was used without being properly encoded in HTML emails sent to users. The actually affected components were mail clients used to view those messages. This issue affects typo3/cms 10.x through 10.4.28, and 11.x through 11.5.10; typo3/cms-core 9.x through 9.5.31, 10.x through 10.4.28, and 11.x through 11.5.10.

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CWE-79 - Cross Site Scripting

Cross-Site Scripting, commonly referred to as XSS, is the most dominant class of vulnerabilities. It allows an attacker to inject malicious code into a pregnable web application and victimize its users. The exploitation of such a weakness can cause severe issues such as account takeover, and sensitive data exfiltration. Because of the prevalence of XSS vulnerabilities and their high rate of exploitation, it has remained in the OWASP top 10 vulnerabilities for years.

Advisory Timeline

  • Published