CVE-2026-48071
OpenReception's client PIN challenge throttle is keyed by emailHash only, allowing cross-tenant lockout
Description
OpenReception's appointment booking software provides an end-to-end encrypted appointment booking platform. Prior to version 1.0.4, the PIN-type challenge throttle uses `emailHash` as the only key. The throttle rows live in the central `challenge_throttle` table, which is shared across all tenants. Every tenant's `/api/tenants/{id}/appointments/verify-challenge` endpoint increments the same row when a PIN response fails, and every tenant's `/api/tenants/{id}/appointments/challenge` endpoint reads the same row when deciding whether to issue a new challenge. When the same `emailHash` exists in multiple tenants on the same OpenReception instance (the same patient holding tunnels in two different clinics that share the platform), an attacker who knows the patient's email can lock out that patient on tenant B by issuing failed challenge responses against tenant A. The attacker needs no relationship to tenant B; the lockout propagates through the shared throttle row. The lockout escalates with repeated failures. The first lockout triggers at 4 failed attempts and lasts approximately 60 seconds. Subsequent failures escalate the lockout duration to 5 minutes, 30 minutes, and 60 minutes per the throttle service's escalation logic. Repeated bursts produce sustained denial of service against the targeted email. Version 1.0.4 patches the issue.
INFO
Published Date :
Aug. 6, 2026, 10:17 p.m.
Last Modified :
Oct. 23, 2026, 9:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-48071
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE |
Solution
- Update OpenReception to version 1.0.4 or later.
- Apply security patches promptly.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-48071.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-48071 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-48071
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-48071 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-48071 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Translated by [email protected]
Oct. 23, 2026
Action Type Old Value New Value Added Translation Title: appointment-booking-software de open-reception, Description: El software de reserva de citas de OpenReception proporciona una plataforma de reserva de citas cifrada de extremo a extremo. Antes de la versión 1.0.4, el limitador de desafíos de tipo PIN utiliza ’emailHash’ como la única clave. Las filas del limitador residen en la tabla central ’challenge_throttle’, que es compartida por todos los inquilinos. El endpoint ’/api/tenants/{id}/appointments/verify-challenge’ de cada inquilino incrementa la misma fila cuando falla una respuesta PIN, y el endpoint ’/api/tenants/{id}/appointments/challenge’ de cada inquilino lee la misma fila al decidir si emitir un nuevo desafío. Cuando el mismo ’emailHash’ existe en múltiples inquilinos en la misma instancia de OpenReception (el mismo paciente con túneles en dos clínicas diferentes que comparten la plataforma), un atacante que conoce el correo electrónico del paciente puede bloquear a ese paciente en el inquilino B al emitir respuestas de desafío fallidas contra el inquilino A. El atacante no necesita ninguna relación con el inquilino B; el bloqueo se propaga a través de la fila compartida del limitador. El bloqueo se intensifica con fallos repetidos. El primer bloqueo se activa con 4 intentos fallidos y dura aproximadamente 60 segundos. Fallos posteriores aumentan la duración del bloqueo a 5 minutos, 30 minutos y 60 minutos según la lógica de escalada del servicio de limitación. Ráfagas repetidas producen una denegación de servicio sostenida contra el correo electrónico objetivo. La versión 1.0.4 corrige el problema. -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 08, 2026
Action Type Old Value New Value Added Reference https://github.com/open-reception/appointment-booking-software/security/advisories/GHSA-f778-wf9x-3qf9 Added SSVC {'id': 'CVE-2026-48071', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-08T02:25:43.741761Z'} -
New CVE Received by [email protected]
Aug. 06, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'open-reception', 'product': 'appointment-booking-software', 'versions': [{'status': 'affected', 'version': '< 1.0.4'}]}] Added Description OpenReception's appointment booking software provides an end-to-end encrypted appointment booking platform. Prior to version 1.0.4, the PIN-type challenge throttle uses `emailHash` as the only key. The throttle rows live in the central `challenge_throttle` table, which is shared across all tenants. Every tenant's `/api/tenants/{id}/appointments/verify-challenge` endpoint increments the same row when a PIN response fails, and every tenant's `/api/tenants/{id}/appointments/challenge` endpoint reads the same row when deciding whether to issue a new challenge. When the same `emailHash` exists in multiple tenants on the same OpenReception instance (the same patient holding tunnels in two different clinics that share the platform), an attacker who knows the patient's email can lock out that patient on tenant B by issuing failed challenge responses against tenant A. The attacker needs no relationship to tenant B; the lockout propagates through the shared throttle row. The lockout escalates with repeated failures. The first lockout triggers at 4 failed attempts and lasts approximately 60 seconds. Subsequent failures escalate the lockout duration to 5 minutes, 30 minutes, and 60 minutes per the throttle service's escalation logic. Repeated bursts produce sustained denial of service against the targeted email. Version 1.0.4 patches the issue. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L Added CWE CWE-307 Added Reference https://github.com/open-reception/appointment-booking-software/commit/828b5297dc4c9827f7a43841d0f839c21462185d Added Reference https://github.com/open-reception/appointment-booking-software/security/advisories/GHSA-f778-wf9x-3qf9