includes/functions.php in Craig Knudsen WebCalendar before 1.0.5 does not protect the noSet variable from external modification, which allows remote attackers to set arbitrary global variables via a URL with modified values in the noSet parameter, which leads to resultant vulnerabilities that probably include remote file inclusion and other issues.
AV:N/AC:L/Au:N/C:P/I:P/A:P
This vulnerability has a 2.18% probability of being exploited in the next 30 days, ranking higher than 82% of all scored CVEs.