PHP iCalendar 2.4 allows remote attackers to obtain sensitive information via a direct request to a .php file, which reveals the installation path in an error message, as demonstrated by rss/rss_common.php and certain other files.

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.

Cross-site scripting (XSS) vulnerability in rss/index.php in PHP iCalendar 2.22 and earlier allows remote attackers to inject arbitrary web script or HTML via the cal parameter.

publish.ical.php in Jim Hu and Chad Little PHP iCalendar 2.21 and earlier does not require authentication for write access to the calendars directory, which allows remote attackers to upload and execute arbitrary PHP scripts via a WebDAV PUT request with a filename containing a .php extension and a trailing null character.

Directory traversal vulnerability in Jim Hu and Chad Little PHP iCalendar 2.21 and earlier allows remote attackers to include and execute arbitrary local files via directory traversal sequences and a NUL (%00) character in the phpicalendar[cookie_language] and phpicalendar[cookie_style] cookies, as demonstrated by injecting PHP sequences into an Apache access_log file, which is then included by day.php.

Multiple directory traversal vulnerabilities in PHP iCalendar 2.0.1, 2.1, and 2.2 allow remote attackers to include arbitrary files via the (1) getdate and possibly other parameters used in the replace_files function in search.php and (2) $file variable as used in the parse function in functions/template.php.

PHP file inclusion vulnerability in index.php in PHP iCalendar 2.0a2 through 2.0.1 allows remote attackers to execute arbitrary PHP code and include arbitrary local files via the phpicalendar cookie. NOTE: this is not a cross-site scripting (XSS) issue as claimed by the original researcher.