CVE-2026-48087 — OpenReception's appointment booking software provides an end-to-end encrypted appointment…¶

Key facts

CVE-2026-48087 is a Critical (9.8) vulnerability: OpenReception's appointment booking software provides an end-to-end encrypted appointment…. This entry ships a detection-only PoC and a Docker test lab.


CVE	CVE-2026-48087
Severity	Critical (9.8)
Detection / prevention	—
PoC	poc.py
Source	2026/CVE-2026-48087/

Details¶

English | 한국어

Description¶

OpenReception's appointment booking software provides an end-to-end encrypted appointment booking platform. Prior to version 1.0.2, the registration handler at POST /api/auth/register/{userId} validates the relationship between the WebAuthn challenge and the registration cookie's email but never validates that the userId in the URL belongs to that email. An unauthenticated attacker requests a challenge for their own email, generates a registration response with their own authenticator, and submits it against any victim user's URL. The challenge-vs-cookie email match passes, the WebAuthn ceremony validates, and addPasskey writes the attacker's credential into the victim's user_passkey rows. The next victim-email login accepts a passkey assertion from the attacker's authenticator and issues a session as the victim. User IDs are not strictly secret on this platform, but the exact set of exposure surfaces should be assessed by the maintainers. Staff-list endpoints return user IDs to authenticated tenant members per the route signature; live verification of all exposure surfaces (whether user IDs leak through any unauthenticated route, through invite-confirmation URLs, or through other administrative views) is part of the pending live PoC. Where the attacker knows the victim's email and userId, the analysis below becomes account takeover. Version 1.0.2 fixes the issue.

Vulnerability Details¶

Property	Value
CVE ID	CVE-2026-48087
CVSS Score	9.8

Proof of Concept¶

Download¶

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-48087/poc.py

Usage¶

# Run PoC against target
python3 poc.py --target <TARGET_URL>

# With authentication
python3 poc.py --target <TARGET_URL> --username <USER> --password <PASS>

⚠️ Warning: This PoC is for authorized security testing only. It uses detection-only techniques and does not exploit or damage target systems.

Test Lab¶

This repository includes a Docker-based test environment with both vulnerable and patched applications.

Quick Start¶

# Clone and navigate to CVE directory
cd CVE-2026-48087

# Start both applications
docker-compose up -d

# Run tests
./run-tests.sh    # Linux/Mac
./run-tests.ps1   # Windows PowerShell

Application Endpoints¶

Application	URL	Status
Vulnerable App	http://localhost:8080	Shows vulnerability
Patched App	http://localhost:8081	Demonstrates fix

Directory Structure¶

├── README.md           # English documentation
├── README_KO.md        # Korean documentation
├── poc.py              # PoC detection script
├── docker-compose.yml  # Container orchestration
├── run-tests.sh        # Linux/Mac test runner
├── run-tests.ps1       # Windows test runner
├── vulnerable-app/     # Vulnerable version
│   ├── app.py
│   ├── Dockerfile
│   └── requirements.txt
└── patched-app/        # Fixed version
    ├── app.py
    ├── Dockerfile
    └── requirements.txt

References¶

https://github.com/open-reception/appointment-booking-software/commit/5f61a2116d68378366edd712c343a9de7b205a74
https://github.com/open-reception/appointment-booking-software/security/advisories/GHSA-j9rw-x2wv-h5rj

Generated by PoC Generator on 2026-08-08T12:08:39.432767898

Frequently asked questions¶

What is CVE-2026-48087?¶

CVE-2026-48087 is a Critical (9.8) vulnerability: OpenReception's appointment booking software provides an end-to-end encrypted appointment…. This entry ships a detection-only PoC and a Docker test lab.

How do I detect CVE-2026-48087?¶

Run the detection-only PoC included with this entry against your Docker test lab to confirm whether a target is affected; pair it with your own IDS logging.

How do I block or mitigate CVE-2026-48087?¶

Upgrade to a fixed version per the vendor advisory; the NVD record lists the affected versions. Use the included PoC to verify your remediation.

For authorized security testing and research only. See the full source and NVD record.