CVE-2026-57959: Hieventsdev Hi.events

Medium severity, CVSS 5.9. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Hieventsdev Hi.events: up to and including 1.9.0

Published 2026-06-29. Last modified 2026-07-14.