Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Multiple cross-site scripting (XSS) vulnerabilities in Jim Hu and Chad Little PHP iCalendar 2.23 rc1 and earlier allow remote attackers to inject arbitrary web script or HTML via the (1) getdate parameter in (a) day.php, (b) month.php, (c) year.php, (d) week.php, (e) search.php, (f) rss/index.php, (g) print.php, and (h) preferences.php; the (2) cpath parameter in (i) day.php, (j) month.php, (k) year.php, (l) week.php, and (m) search.php; the (3) query parameter in search.php; and possibly the cpath, (4) unset, and (5) set parameters in a setcookie action in preferences.php; different vectors than CVE-2006-3319. NOTE: it was later reported that vectors b, c, and d also affect 2.24.
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.