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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.

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




HIGH: 8.3CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

MEDIUM: 6.5CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

Problem types

Exposure of Private Personal Information to an Unauthorized Actor

Product status

Default status
unaffected

Any version
affected

Credits

George Chen finder

References

github.com/HiEventsDev/Hi.Events/issues/1224 exploit

github.com/HiEventsDev/Hi.Events/issues/1224 (Researcher Disclosure) issue-tracking

github.com/HiEventsDev/Hi.Events/pull/1229 (Pull Request) issue-tracking

www.vulncheck.com/...pii-exposure-via-check-in-list-short-id third-party-advisory

cve.org (CVE-2026-57960)

nvd.nist.gov (CVE-2026-57960)

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