Steps:

1. Attacker go to any one of them Component, Custom Field, Category OR Version
2. Attacker in Name Filed add XSS Payload: Component \"><img src=x onerror=alert('ComponentName')>
3. Go to Test Repository OR Test Plan Board
4. Click in Filters > ADVANCED.
5. Now IF user add this search Syntax in JQL Search :

 {{component = "Component \"><img src=x onerror=alert('ComponentName')>" }}