CVE-2026-75524 OpenReception: race condition in add-to-tunnel and create-new-client allows overlapping appointments for one agent
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-75524?
CVE-2026-75524 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. Prior to version 2.2.2, an attacker overbooks an agent, placing multiple appointments into a single time slot that the system is designed to keep exclusive. The number of overlapping appointments equals the number of concurrent requests, and one booking token is enough because the token is consumed after the insert. This results in the integrity of the booking-calendar breaking and availability being denied to other clients. This issue has been patched in version 2.2.2.
Weakness: CWE-367
Which versions are affected by CVE-2026-75524?
How do I fix CVE-2026-75524?
No fix has been published for CVE-2026-75524 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-75524 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-75524 exists.
Sources
Also known as GHSA-q452-m9pf-qj9j.