PHP Event Calendar through 2021-11-04 allows persistent cross-site scripting (XSS), as demonstrated by the /server/ajax/events_manager.php title parameter. This can be exploited by an adversary in multiple ways, e.g., to perform actions on the page in the context of other users, or to deface the site.

PHP Event Calendar before 2021-09-03 allows SQL injection, as demonstrated by the /server/ajax/user_manager.php username parameter. This can be used to execute SQL statements directly on the database, allowing an adversary in some cases to completely compromise the database system. It can also be used to bypass the login form.

Multiple cross-site scripting (XSS) vulnerabilities in cl_files/index.php in SoftComplex PHP Event Calendar 1.5.1, and possibly earlier, allow remote attackers to inject arbitrary web script or HTML via the (1) ti, (2) bi, or (3) cbgi parameters.

PHP remote file inclusion vulnerability in calendar.php in SoftComplex PHP Event Calendar 1.4 allows remote attackers to execute arbitrary PHP code via a URL in the path_to_calendar parameter, which overwrites the $path_to_calendar variable from an extract function call.

Cross-site scripting (XSS) vulnerability in Softcomplex PHP Event Calendar 1.5 allows remote authenticated users to inject arbitrary web script or HTML, and corrupt data, via the (1) username and (2) password parameters, which are not sanitized before being written to users.php. NOTE: while this issue was originally reported as XSS, the primary issue might be direct static code injection with resultant XSS.

The Event Calendar module 2.13 for PHP-Nuke allows remote attackers to gain sensitive information via an HTTP request to (1) config.php, (2) index.php, or (3) submit.php, which reveal the full path in an error message.

Cross-site scripting (XSS) vulnerability in the Event Calendar module 2.13 for PHP-Nuke allows remote attackers to execute arbitrary web script via the (1) type, (2) day, (3) month, or (4) year parameters in a Preview operation, or (5) event comments.