CVE-2026-57959CWE-367

Hi.Events 1.9.0 - Promo Code Max-Usage Bypass via Asynchronous Job Race Condition

High · published June 29, 2026

CVSS v4.0
8.2
EPSS
0%
Percentile
16.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
8.2 · HIGH
Vector
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
EPSS
0.00256 · 16.3th percentile
Weakness
CWE-367 · Time-of-check Time-of-use (TOCTOU) Race Condition
Published
2026-06-29T17:24Z
EPSS history
Timeline
  • 29 JUN 17:24Z
    Hi.Events 1.9.0 - Promo Code Max-Usage Bypass via Asynchronous Job Race Condition
    cvelistv5