An issue was discovered in Open Ticket Request System (OTRS) 6.0.x through 6.0.9, 5.0.x through 5.0.28, and 4.0.x through 4.0.30. An attacker who is logged into OTRS as an agent may escalate their privileges by accessing a specially crafted URL.

An Access Bypass issue exists in OTRS Help Desk before 3.2.4, 3.1.14, and 3.0.19, OTRS ITSM before 3.2.3, 3.1.8, and 3.0.7, and FAQ before 2.2.3, 2.1.4, and 2.0.8. Access rights by the object linking mechanism is not verified

In Open Ticket Request System (OTRS) 4.0.x before 4.0.32, 5.0.x before 5.0.30, and 6.0.x before 6.0.11, an attacker could send a malicious email to an OTRS system. If a user with admin permissions opens it, it causes deletions of arbitrary files that the OTRS web server user has write access to.

A Cross-Site Scripting (XSS) Vulnerability exists in OTRS ITSM prior to 3.2.4, 3.1.8, and 3.0.7 and FAQ prior to 2.1.4 and 2.0.8 via changes, workorder items, and FAQ articles, which could let a remote malicious user execute arbitrary code.

In Open Ticket Request System (OTRS) 4.0.x before 4.0.32, 5.0.x before 5.0.30, and 6.0.x before 6.0.11, an attacker could send a malicious email to an OTRS system. If a logged in user opens it, the email could cause the browser to load external image or CSS resources.