CVE-2026-75525 OpenReception: unauthenticated ML-KEM key injection into the staff-crypto recipient directory in any tenant
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-75525?
CVE-2026-75525 is a medium-severity vulnerability in open-reception appointment-booking-software, published on 23 Oct 2026.
Official description
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.
Weakness: CWE-863
Which versions are affected by CVE-2026-75525?
How do I fix CVE-2026-75525?
No fix has been published for CVE-2026-75525 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-75525 being exploited?
There is no known exploitation of CVE-2026-75525 in the wild and no public exploit code.
Sources
Also known as GHSA-qc72-9fg9-h66h.