SSRF in Medplum
CVE-2026-49120
Medplum before 5.1.14 contains a server-side request forgery vulnerability in the subscription worker that allows authenticated users to perform unauthorized internal network requests by creating FHIR Subscription resources with arbitrary endpoint URLs. Attackers can point subscription endpoints at internal addresses such as cloud instance metadata services, internal databases, or container orchestration endpoints to exfiltrate IAM credentials and patient health records via the POST body containing full FHIR resource payloads.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (28.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 28.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.001
Affected products
- Medplum — versions 0
Weakness classification (CWE)
References
- github.com/medplum/medplum/releases/tag/v5.1.14 (release-notes)
- github.com/medplum/medplum/pull/9334 (issue-tracking)
- github.com/medplum/medplum/commit/87595e98d756d840d70d9dc87beb9d4f9e158b59 (patch)
- www.vulncheck.com/advisories/medplum-ssrf-via-fhir-subscription-endpoint (third-party-advisory)
Frequently asked questions
- What is CVE-2026-49120?
- CVE-2026-49120 is a high-severity vulnerability in Medplum, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.5/10. Published 2026-06-02.
- How severe is CVE-2026-49120?
- High severity. CVSS v3 base score is 8.5 out of 10.