Arcabit (Subscription renewal service) vulnerable to XSS
Arcabit (Subscription renewal service) - XSSVulnerable page: https://www.arcabit.pl/pre-renew.html
PoC
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It is enough to insert any XSS code directly into serial field and your code will be executed and displayed immediately.
Note: This is a proof of concept and it doesn't reflect the views or interests of above website.