CVE-2026-44506 Medplum - Exposure of OAuth client secret via dynamic registration endpoint in self-hosted configurations
Attackers can expose OAuth client secrets via the dynamic registration endpoint in self-hosted Medplum configurations, potentially bypassing authentication.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-44506?
CVE-2026-44506 is a high-severity vulnerability in medplum, published on 3 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-200
Which versions are affected by CVE-2026-44506?
How do I fix CVE-2026-44506?
No fix has been published for CVE-2026-44506 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-44506 being exploited?
There is no known exploitation of CVE-2026-44506 in the wild and no public exploit code.
Sources
Also known as GHSA-ch8p-j6cm-r7w5.