CVE-2026-65825: OpenReception appointment booking software authentication bypass in PIN throttle

CVE-2026-65825 · Severity: high · CVSS 7.5 · Published 2026-10-23

OpenReception's appointment booking platform uses a six-digit PIN to control access to clients' encrypted appointment data. A flaw in how the system manages rate-limiting across multiple customer organizations allows an attacker at one organization to disable PIN brute-force protections for clients at another organization, enabling rapid guessing of PINs and takeover of appointment access. An attacker can add, cancel, or view another client's appointments.

Technologies: OpenReception Appointment-Booking-Software. Vendors: OpenReception.

Quick answers

Is CVE-2026-65825 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-65825 being exploited in the wild.
How severe is CVE-2026-65825?
High severity, with a CVSS score of 7.5, published 23 October 2026.
Which products and versions are affected?
OpenReception Appointment-Booking-Software 2.1.0 and prior.
Is there a fix for CVE-2026-65825?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-65825 attacked?
It is attacked over the network, in a web application.
Am I affected by CVE-2026-65825?
Check whether you run OpenReception Appointment-Booking-Software at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The challenge_throttle table uses emailHash (tenant-independent) as its primary key but stores tenant_id as an unkeyed column. The recordFailedAttempt function writes failures with the caller's tenant ID but on conflict only updates attempt counts, leaving the row's tenant_id unchanged. checkThrottle reads throttle state scoped to the caller's tenant, so once tenant A owns a throttle record for an identifier, tenant B's checks never match, bypassing throttle enforcement. Combined with a weak six-digit PIN space (10^6) and a spoofable generic rate limiter, this enables online brute-force exhaustion in hours to days.

Affected products

  • OpenReception appointment-booking-software 2.1.0 and prior

Timeline

  • 2026-07-03: disclosed
  • 2026-10-23: advisory

References

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