CVE-2026-48082
OpenReception's bootstrap challenge proof-of-work difficulty hardcoded to 16 bits, which enables abuse rate amplification
Description
OpenReception's appointment booking software provides an end-to-end encrypted appointment booking platform. Prior to version 1.0.6, the bootstrap challenge endpoint at `/api/tenants/{id}/appointments/bootstrap-challenge` issues a SHA-256 proof-of-work with `difficulty=4` hex zeros, equivalent to 16 bits of work. Modern hardware solves this in under 200 milliseconds, providing essentially no friction against automated abuse of the patient booking flow. Proof-of-work is used in the booking flow as a rate-limiter for unauthenticated clients establishing tunnels and submitting appointments. At 16 bits of difficulty, the construct is decorative rather than effective. An attacker can solve PoW challenges as fast as the server can issue them, defeating the rate-limiting purpose. The handler also calls `challengeThrottleService.checkThrottle(binding, "passkey")`, but the binding includes attacker-controlled values (`tunnelId`, `clientPublicKey`, and optional `emailHash`). For each fresh attempt, the attacker can supply new values, producing a new throttle key and bypassing the per-binding accumulation. Practical abuse friction is therefore the PoW difficulty itself, not a stable per-IP or per-email server-side throttle. Version 1.0.6 fixes 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-2026-48082
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 | LOW | [email protected] | ||||
| CVSS 3.1 | LOW | MITRE-CVE |
Solution
- Update OpenReception booking software to version 1.0.6.
- Increase proof-of-work difficulty in challenge endpoint.
- Implement robust server-side throttling.
- Validate all client-controlled input.
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-2026-48082.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-48082 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-2026-48082
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-2026-48082 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-48082 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 1.0.6, el endpoint de desafío de arranque en “/api/tenants/{id}/appointments/bootstrap-challenge” emite una prueba de trabajo SHA-256 con “difficulty=4” ceros hexadecimales, equivalente a 16 bits de trabajo. El hardware moderno resuelve esto en menos de 200 milisegundos, proporcionando esencialmente ninguna fricción contra el abuso automatizado del flujo de reserva de pacientes. La prueba de trabajo se utiliza en el flujo de reserva como un limitador de velocidad para clientes no autenticados que establecen túneles y envían citas. Con 16 bits de dificultad, la construcción es decorativa en lugar de efectiva. Un atacante puede resolver desafíos de PoW tan rápido como el servidor puede emitirlos, frustrando el propósito de limitación de velocidad. El gestor también llama a “challengeThrottleService.checkThrottle(binding, “passkey”)”, pero el binding incluye valores controlados por el atacante (“tunnelId”, “clientPublicKey”, y “emailHash” opcional). Para cada nuevo intento, el atacante puede proporcionar nuevos valores, produciendo una nueva clave de limitación y eludiendo la acumulación por binding. La fricción práctica contra el abuso es, por lo tanto, la dificultad de la PoW en sí misma, no una limitación estable por IP o por correo electrónico del lado del servidor. La versión 1.0.6 corrige el problema. -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 07, 2026
Action Type Old Value New Value Added Reference https://github.com/open-reception/appointment-booking-software/security/advisories/GHSA-hm9g-mh7x-657g Added SSVC {'id': 'CVE-2026-48082', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-07T14:58:35.100533Z'} -
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': '< 1.0.6'}]}] Added Description OpenReception's appointment booking software provides an end-to-end encrypted appointment booking platform. Prior to version 1.0.6, the bootstrap challenge endpoint at `/api/tenants/{id}/appointments/bootstrap-challenge` issues a SHA-256 proof-of-work with `difficulty=4` hex zeros, equivalent to 16 bits of work. Modern hardware solves this in under 200 milliseconds, providing essentially no friction against automated abuse of the patient booking flow. Proof-of-work is used in the booking flow as a rate-limiter for unauthenticated clients establishing tunnels and submitting appointments. At 16 bits of difficulty, the construct is decorative rather than effective. An attacker can solve PoW challenges as fast as the server can issue them, defeating the rate-limiting purpose. The handler also calls `challengeThrottleService.checkThrottle(binding, "passkey")`, but the binding includes attacker-controlled values (`tunnelId`, `clientPublicKey`, and optional `emailHash`). For each fresh attempt, the attacker can supply new values, producing a new throttle key and bypassing the per-binding accumulation. Practical abuse friction is therefore the PoW difficulty itself, not a stable per-IP or per-email server-side throttle. Version 1.0.6 fixes the issue. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L Added CWE CWE-770 Added Reference https://github.com/open-reception/appointment-booking-software/commit/e9c96c049ebf558df7a9e4c5c93f6fe2b092c8c6 Added Reference https://github.com/open-reception/appointment-booking-software/security/advisories/GHSA-hm9g-mh7x-657g