Course-tencent-cloud before 2.0.2 contains an insecure direct object reference vulnerability that allows unauthenticated attackers to view other users' refund previews by supplying an order sn to /api/refund/confirm. Attackers can compute valid sn values from Sqids-encoded sequential order ids using the default key to disclose ordered items, prices, refund amounts, fees and deadlines.
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