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.

Severity (CVSS)

Base score8.2
SeverityHigh
VersionCVSS 4.0
VectorCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Provided byCNA

Weaknesses

  • CWE-367 — Time-of-check Time-of-use (TOCTOU) Race Condition

Affected products

VendorProductVersions
HiEventsDevHi.Events0 to <=1.9.0

References

Authoritative sources

This page is a snapshot. For the latest enrichment and updates, view the record on CVE.org or the NVD.

Generated from the official CVE List on 30 Jun 2026 07:04 UTC.