CVE-2026-57959Public exploitNetwork attack vector

Unlimited promo redemption via deferred usage counting

Published Jun 29, 2026 · Updated Jun 29, 2026

Business logic bypass in Hi.Events 1.9.0 and earlier allows remote attackers to redeem limited promo codes without usage limits. CreateOrderHandler validates order_usage_count only at reservation, while UpdateEventStatisticsJob increments it asynchronously after completion and CompleteOrderHandler omits revalidation. Access to a restricted code is required; sequential reservations can lock in unlimited discounts and cause organizer financial loss.

CVSS severity8.2
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Business logic bypass in Hi.Events 1.9.0 and earlier allows remote attackers to redeem limited promo codes without usage limits. CreateOrderHandler validates order_usage_count only at reservation, while UpdateEventStatisticsJob increments it asynchronously after completion and CompleteOrderHandler omits revalidation. Access to a restricted code is required; sequential reservations can lock in unlimited discounts and cause organizer financial loss.

The record

CVE
CVE-2026-57959
Published
Jun 29, 2026
Updated
Jun 29, 2026
Vendor
Hi.Events
Product
Hi.Events
Classifications
CWE-367, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.9.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Hi.Events · Hi.Eventsversion=0 <=1.9.0

Published CVSS scores

8.2VulnCheckCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
5.9VulnCheckCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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