What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-23 · updated 2026-10-29
• Weakness: CWE-367

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

• open-reception appointment-booking-software: before 2.2.2

References

• https://github.com/open-reception/appointment-booking-software/commit/73663288a8d4ad2ad31d897dc1f494ace2f0e452
• https://github.com/open-reception/appointment-booking-software/releases/tag/v2.2.2
• https://github.com/open-reception/appointment-booking-software/security/advisories/GHSA-q452-m9pf-qj9j
• https://github.com/open-reception/appointment-booking-software/security/advisories/GHSA-q452-m9pf-qj9j

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