CVE-2026-48082 open-reception CVE debrief

Who should care

Defenders responsible for OpenReception's appointment booking software should assess exposure and prioritize verification and remediation to prevent potential abuse. The vulnerability allows for easy abuse of the patient booking flow, potentially leading to denial-of-service or data tampering. Defenders should review and monitor the appointment booking flow for potential abuse and implement additional rate-limiting measures to prevent automated abuse.

Why it matters

CVE-2026-48082 is a vulnerability in OpenReception's appointment booking software that allows for easy abuse of the patient booking flow due to a low difficulty proof-of-work challenge. Defenders should prioritize verification and remediation to prevent potential abuse.

• Defenders should verify and upgrade to version 1.0.6 or later to prevent potential abuse of the appointment booking flow.
• The low difficulty proof-of-work challenge can be easily solved by modern hardware, making it ineffective as a rate-limiter.
• The vulnerability allows for easy abuse of the patient booking flow, potentially leading to denial-of-service or data tampering.

Technical summary

The proof-of-work 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. This can be solved by modern hardware in under 200 milliseconds, making it ineffective as a rate-limiter. The handler also calls `challengeThrottleService.checkThrottle(binding, 'passkey')`, but the binding includes attacker-controlled values, allowing an attacker to bypass the per-binding accumulation. The vulnerability allows for easy abuse of the patient booking flow, potentially leading to denial-of-service or data tampering.

Defensive priority

Defenders should prioritize verifying and upgrading to version 1.0.6 or later to prevent potential abuse of the appointment booking flow.

Recommended defensive actions

• Verify the version of OpenReception's appointment booking software and upgrade to version 1.0.6 or later if necessary.
• Review and monitor the appointment booking flow for potential abuse.
• Implement additional rate-limiting measures to prevent automated abuse.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record and source references provide information on the vulnerability and its fix. However, there is limited information on potential exploitation or impact. Defenders should verify the version of OpenReception's appointment booking software and review and monitor the appointment booking flow for potential abuse. The vulnerability allows for easy abuse of the patient booking flow, potentially leading to denial-of-service or data tampering.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.