What’s Vulnerable › Vulnerabilities

CVE-2026-44506: Medplum - Exposure of OAuth client secret via dynamic registration endpoint in self-hosted configurations

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-03 · updated 2026-09-09
• Weakness: CWE-200

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.

Affected products

• medplum: from 4.1.10, < 5.1.7

References

• https://github.com/medplum/medplum/releases/tag/v5.1.7
• https://github.com/medplum/medplum/security/advisories/GHSA-ch8p-j6cm-r7w5

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