Vulnerability · Published Jun 29, 2026 · Assigned by VulnCheck

CVE-2026-57960Hi.Events 1.9.0 - Unauthenticated Attendee PII Exposure via Check-in List short_id

Medium 6.5

In plain English

A medium-severity security flaw in Hi.Events from HiEventsDev. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.4%top 63.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Hi.Events through 1.9.0 public check-in list endpoints use short_id as sole access control, allowing unauthenticated access to retrieve full attendee lists including emails and personal information. Attackers with knowledge of the short_id can call GET /api/public/check-in-lists/{short_id}/attendees to read attendee data and create or delete check-in records without authentication.

Affected products (as reported)

Vendor	Product	Versions
HiEventsDev	Hi.Events	0 – through 1.9.0

Weakness: CWE-359 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

References

Researcher Disclosure issue-tracking
Pull Request issue-tracking
https://www.vulncheck.com/advisories/hi-events-unauthenticated-attendee-pii-exposure-via-check-in-list-short-id third-party-advisory