The RSS subsystem in ILIAS 5.1.x, 5.2.x, and 5.3.x before 5.3.5 has XSS via a URI to Services/Feeds/classes/class.ilExternalFeedItem.php.

Services/Feeds/classes/class.ilExternalFeedItem.php in ILIAS 5.1.x, 5.2.x, and 5.3.x before 5.3.5 has XSS via a link attribute.

ILIAS 5.1.x, 5.2.x, and 5.3.x before 5.3.5 redirects a logged-in user to a third-party site via the returntourl parameter.

Services/COPage/classes/class.ilPCSourceCode.php in ILIAS 5.1.x, 5.2.x, and 5.3.x before 5.3.5 has XSS.

ILIAS before 5.1.26, 5.2.x before 5.2.15, and 5.3.x before 5.3.4, due to inconsistencies in parameter handling, is vulnerable to various instances of reflected cross-site-scripting.

Ilias 5.3 before 5.3.12; 5.2 before 5.2.21 is affected by: Cross Site Scripting (XSS) - CWE-79 Type 2: Stored XSS (or Persistent). The impact is: Execute code in the victim's browser. The component is: Assessment / TestQuestionPool. The attack vector is: Cloze Test Text gap (attacker) / Corrections view (victim). The fixed version is: 5.3.12.