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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.

PUBLISHED Reserved 2026-06-26 | Published 2026-06-29 | Updated 2026-07-14 | Assigner VulnCheck




HIGH: 8.2CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

MEDIUM: 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Problem types

Time-of-check Time-of-use (TOCTOU) Race Condition

Product status

Default status
unaffected

Any version
affected

Credits

George Chen finder

References

github.com/HiEventsDev/Hi.Events/issues/1223 (Researcher Disclosure) issue-tracking

www.vulncheck.com/...ass-via-asynchronous-job-race-condition third-party-advisory

cve.org (CVE-2026-57959)

nvd.nist.gov (CVE-2026-57959)

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