CVE-2026-57959
MEDIUM
NVD
CVSS Score
5.9
Severity
MEDIUM
Published
Jun 29, 2026
Vendor
unknown
Description
Hi.Events through 1.9.0 contains a promo code validation vulnerability where reservation validates usage count before asynchronous UpdateEventStatisticsJob increments it, allowing attackers to redeem limited promo codes unlimited times. Attackers can sequentially reserve multiple orders with the same restricted promo code, each reading order_usage_count=0 and passing validation, then complete them all at discounted prices without concurrent requests.