CVE-2026-44506
Received Received - Intake

Medplum OAuth Client Secret Exposure via Redirect URI

Publication date: 2026-09-03

Last updated on: 2026-09-03

Assigner: GitHub, Inc.

Description
Medplum is a developer platform that enables development of healthcare apps. In Medplum versions 4.1.10 through 5.1.6, the /oauth2/register endpoint could return the client_secret of preconfigured OAuth clients defined via the defaultOAuthClients server configuration when a matching redirect_uri was provided. This issue has been patched in version 5.1.7.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-09-03
Last Modified
2026-09-03
Generated
2026-09-04
AI Q&A
2026-09-03
EPSS Evaluated
N/A
NVD
CVE-2026-44506
EUVD
EUVD-2026-70699

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
medplum medplum From 4.1.10 (inc) to 5.1.6 (inc)
medplum medplum 5.1.7

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-200 The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This vulnerability affects Medplum, a healthcare app development platform. In versions 4.1.10 through 5.1.6, the /oauth2/register endpoint could unintentionally expose the client_secret of preconfigured OAuth clients when a matching redirect_uri was provided. This secret is used for authentication and should remain confidential.

Impact Analysis

If exploited, this vulnerability could allow attackers to gain access to sensitive authentication credentials. This might lead to unauthorized access to healthcare applications, potential data breaches, or manipulation of user sessions. The impact depends on the privileges of the affected OAuth clients.

Compliance Impact

This vulnerability could lead to unauthorized access to protected health information (PHI), violating HIPAA requirements for safeguarding patient data. It may also result in data breaches that could trigger GDPR fines for inadequate security measures and lack of proper data protection.

Mitigation Strategies

Upgrade Medplum to version 5.1.7 or later to patch the vulnerability. Review OAuth client configurations and ensure no preconfigured client secrets are exposed.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-44506. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart