---
id: CVE-2026-75525
title: >-
  OpenReception: unauthenticated ML-KEM key injection into the staff-crypto
  recipient directory in any tenant
summary: >-
  OpenReception's appointment booking software provides an end-to-end encrypted
  appointment booking platform. In versions 2.1.0 and prior, an unauthenticated
  attacker can store an arbitrary ML-KEM-768 public key under any existing
  user's i…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-863
vendor: open-reception
product: appointment-booking-software
affected:
  - appointment-booking-software <= 2.1.0
published: '2026-10-23'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T20:42:21.394Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-75525'
references:
  - url: >-
      https://github.com/open-reception/appointment-booking-software/security/advisories/GHSA-qc72-9fg9-h66h
    label: >-
      https://github.com/open-reception/appointment-booking-software/security/advisories/GHSA-qc72-9fg9-h66h
tags:
  - cve.org
ingestedAt: '2026-10-23T21:38:13.057Z'
---

## Overview

OpenReception's appointment booking software provides an end-to-end encrypted appointment booking platform. In versions 2.1.0 and prior, an unauthenticated attacker can store an arbitrary ML-KEM-768 public key under any existing user's identity in any tenant's staff-crypto recipient directory. The product's design guarantees that appointment data is end-to-end encrypted to staff members and that the staff recipient directory is not attacker-writable, so that even administrators and the operator cannot read patient data. This endpoint breaks that guarantee for an unauthenticated remote actor: it allows writing an arbitrary encryption recipient into the recipient directory of any tenant. The injected key receives the tunnel key of every appointment booked afterward in that tenant, because booking clients encrypt to all active staff keys. The attacker holds the corresponding secret key and is a persistent, unauthorized recipient of that key material. At time of publication, there are no publicly available patches.

## Affected

- `appointment-booking-software <= 2.1.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.