Vulnerability · Published Jun 29, 2026 · Assigned by VulnCheck

CVE-2026-57959Hi.Events 1.9.0 - Promo Code Max-Usage Bypass via Asynchronous Job Race Condition

Medium 5.9

In plain English

A medium-severity security flaw in Hi.Events from HiEventsDev. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities).

Severity (CVSS 3.1)5.9Medium

Exploit odds (30 days)0.3%top 82.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
HiEventsDev	Hi.Events	0 – through 1.9.0

Weakness: CWE-367 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

References

Researcher Disclosure issue-tracking
https://www.vulncheck.com/advisories/hi-events-promo-code-max-usage-bypass-via-asynchronous-job-race-condition third-party-advisory