osTicket versions from 1.10 up to 1.17.7 and from 1.18.0 up to 1.18.3 are vulnerable to a stored XSS due to a vulnerable Bootstrap Tooltip component and insufficient HTML sanitization, allowing remote attackers to execute arbitrary JavaScript in Agent or Admin sessions.
https://github.com/osTicket/osTicket/releases/tag/v1.18.4
https://github.com/osTicket/osTicket/releases/tag/v1.17.8
https://github.com/osTicket/osTicket/commit/5afdf5450ff5c7d218447014b7abbb5f1e6dd42f