CVE-2026-57959

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 4.0

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

CVSS 3.1

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

EPSS

0.3% chance of exploitation in the next 30 days; higher than 17% of CVEs (scores of 2026-10-25)

CWE

CWE-367

Published

2026-06-29

Modified

2026-10-25

Record from

the NVD, synced 2026-10-25

References

• https://github.com/HiEventsDev/Hi.Events/issues/1223
• https://www.vulncheck.com/advisories/hi-events-promo-code-max-usage-bypass-via-asynchronous-job-race-condition

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