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Vulnerability · Published Oct 23, 2026 · Assigned by GitHub_M

CVE-2026-75524OpenReception: race condition in add-to-tunnel and create-new-client allows overlapping appointments for one agent

Medium 5.4

In plain English

A medium-severity security flaw in appointment-booking-software from open-reception. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% of all known vulnerabilities).

Severity (CVSS 3.1)5.4Medium
Exploit odds (30 days)0.3%top 81.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

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.

Affected products (as reported)

VendorProductVersions
open-reception appointment-booking-software < 2.2.2

Weakness: CWE-367 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

References