TI-2026-32440 Aliases CVE-2026-44506

Medplum - Exposure of OAuth client secret via dynamic registration endpoint in self-hosted configurations

MEDIUM 42CWE-200Published 2026-09-03 · Updated 2026-09-04

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Information disclosure
Confidentiality · integrity · availability: Low · High · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-200.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00352 29th percentileScored 2026-11-07

Fix Fixed medplum (medplum): 5.1.7

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
medplum	medplum	4.1.10 to before 5.1.7	5.1.7	Patch available	CNA

medplum Vendormedplum Affected 4.1.10 to before 5.1.7 Fixed in 5.1.7 Patch available CNA

Remediation

Fix · CNA medplum (medplum) Fixed in 5.1.7

Timeline

2026-10-02 Threatist record created from CVE-2026-44506

References

Other 2

TI-2026-38748 Medplum - Improper Validation of Redirect URI in External Auth Callback allows Authorization Code Leakage CVSS 3.1HIGH 7.1
TI-2026-36340 Medplum < 5.1.14 SSRF via FHIR Subscription Endpoint CVSS 4.0MEDIUM 6.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences