Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
A Stored Cross-Site Scripting (XSS) vulnerability was discovered in Messenger/messenger_ajax.php in REDCap 12.0.11. This issue allows any authenticated user to inject arbitrary code into the messenger title (aka new_title) field when editing an existing conversation. The payload executes in the browser of any conversation participant with the sidebar shown.
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.