CVE-2026-57959 Hi.Events 1.9.0 - Promo Code Max-Usage Bypass via Asynchronous Job Race Condition
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-57959?
CVE-2026-57959 is a high-severity vulnerability in HiEventsDev Hi.Events, published on 29 Jun 2026.
Official 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.
Weakness: CWE-367
Which versions are affected by CVE-2026-57959?
How do I fix CVE-2026-57959?
No fix has been published for CVE-2026-57959 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-57959 being exploited?
There is no known exploitation of CVE-2026-57959 in the wild and no public exploit code.
Sources
Also known as GHSA-m75j-c5ff-9wh8.