CVE-2026-48082: OpenReception's appointment booking software provides an end-to-end encrypted appointment booking platform. Prior to version 1.0.6, the bootstrap chal...

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.

Metrics

CVSS 3.1

3.7/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

EPSS Probability

0.37%

29.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-770

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
open-reception	appointment-booking-software	< 1.0.6

References

Timeline

Published: Aug 6, 2026
Last Modified: Aug 7, 2026
Status: Received

Frequently Asked Questions

What is CVE-2026-48082?

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.

How severe is CVE-2026-48082?

CVE-2026-48082 has a CVSS score of 3.7/10 (LOW severity). The EPSS model estimates a 0.37% probability of exploitation in the next 30 days.

How do I fix CVE-2026-48082?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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