Cross Site Scripting (XSS) exists in Tiki before 12.13, 15.6, 17.2, and 18.1.

Tiki 17.1 does not validate user input for special characters; consequently, a CSV Injection attack can open a CMD.EXE or Calculator window on the victim machine to perform malicious activity, as demonstrated by an "=cmd|' /C calc'!A0" payload during User Creation.

The Calendar component in Tiki 17.1 allows HTML injection.

Tiki 17.1 allows upload of a .PNG file that actually has SVG content, leading to XSS.

An XSS vulnerability (via an SVG image) in Tiki before 18 allows an authenticated user to gain administrator privileges if an administrator opens a wiki page with a malicious SVG image, related to lib/filegals/filegallib.php.

tiki wiki cms groupware <=15.2 has a xss vulnerability, allow attackers steal user's cookie.

Cross-Site Request Forgery (CSRF) vulnerability via IMG element in Tiki before 16.3, 17.x before 17.1, 12 LTS before 12.12 LTS, and 15 LTS before 15.5 LTS allows an authenticated user to gain administrator privileges if an administrator opens a wiki page with an IMG element, related to tiki-assignuser.php.

Cross-Site Request Forgery (CSRF) vulnerability via IMG element in Tiki before 16.3, 17.x before 17.1, 12 LTS before 12.12 LTS, and 15 LTS before 15.5 LTS allows an authenticated user to edit global permissions if an administrator opens a wiki page with an IMG element, related to tiki-objectpermissions.php. For example, an attacker could assign administrator privileges to every unauthenticated user of the site.

TikiFilter.php in Tiki Wiki CMS Groupware 12.x through 16.x does not properly validate the imgsize or lang parameter to prevent XSS.

lib/core/TikiFilter/PreventXss.php in Tiki Wiki CMS Groupware 16.2 allows remote attackers to bypass the XSS filter via padded zero characters, as demonstrated by an attack on tiki-batch_send_newsletter.php.