CVE-2026-57959: Time-of-check Time-of-use (TOCTOU) Race Condition in HiEventsDev Hi.Events
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.
CVE-2026-57959: Time-of-check Time-of-use (TOCTOU) Race Condition in HiEventsDev Hi.Events
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.
CVSS v4.0
Score 8.2high
Affected software
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Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-06-26T13:59:33.048Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a42b42827e9c7971940f873
Added to database: 06/29/2026, 18:06:32 UTC
Last updated: 06/29/2026, 18:06:32 UTC
Views: 1
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