The stored-XSS vulnerability was discovered in Moodle which exists due to insufficient sanitization of user-supplied data in several "social" user profile fields. An attacker could inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website.
Exploitability
AV:NAC:LPR:LUI:RScope
S:CImpact
C:LI:LA:N5.4/CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:NInjection