Information disclosure in Medplum

CVE-2026-44506

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.

Vulnerability class: Information Disclosure

Published · last modified .

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (27.3th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 27.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-44506: held from 0.002 to 0.004.

EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.001

Affected products

  • Medplum — versions >= 4.1.10, < 5.1.7

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-44506?
CVE-2026-44506 is a high-severity vulnerability in Medplum, classified under Information Disclosure. CVSS score: 8.2/10. Published 2026-09-03.
How severe is CVE-2026-44506?
High severity. CVSS v3 base score is 8.2 out of 10.