OAuth Vulnerability in Medplum Developer Platform
CVE-2026-44506

8.2HIGH

Key Information:

Vendor

Medplum

Status
Medplum
Vendor
CVE Published:
3 September 2026

What is CVE-2026-44506?

Medplum, a platform for developing healthcare applications, is susceptible to an OAuth vulnerability present in versions 4.1.10 through 5.1.6. This flaw allows an attacker to retrieve the client_secret of preconfigured OAuth clients through the /oauth2/register endpoint if a matching redirect_uri is supplied. The issue has been addressed in version 5.1.7, and users are advised to update to this version to secure their applications.

Affected Version(s)

medplum >= 4.1.10, < 5.1.7

References

https://github.com/medplum/medplum/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/medplum/medplum/releases/tag/v5.1.7
x_refsource_MISC

CVSS V3.1

Score:
8.2
Severity:
HIGH
Confidentiality:
Low
Integrity:
High
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.