A reflected XSS issue was discovered in DAViCal through 1.1.8. It echoes the action parameter without encoding. If a user visits an attacker-supplied link, the attacker can view all data the attacked user can view, as well as perform all actions in the name of the user. If the user is an administrator, the attacker can for example add a new admin user to gain full access to the application.

A stored XSS issue was discovered in DAViCal through 1.1.8. It does not adequately sanitize output of various fields that can be set by unprivileged users, making it possible for JavaScript stored in those fields to be executed by another (possibly privileged) user. Affected database fields include Username, Display Name, and Email.

A CSRF issue was discovered in DAViCal through 1.1.8. If an authenticated user visits an attacker-controlled webpage, the attacker can send arbitrary requests in the name of the user to the application. If the attacked user is an administrator, the attacker could for example add a new admin user.