Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Two CalendarXP products have XSS in common parts of HTML files. CalendarXP FlatCalendarXP through 9.9.290 has XSS in iflateng.htm and nflateng.htm. CalendarXP PopCalendarXP through 9.8.308 has XSS in ipopeng.htm and npopeng.htm.
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.