Auth bypass in Openemr
CVE-2026-67610
OpenEMR through 8.2.0 contains an improper authentication vulnerability in the OAuth2 dynamic client registration endpoint that allows unauthenticated attackers to register a malicious client with system-level FHIR scopes by supplying a self-generated RSA keypair via the jwks field. Once an administrator approves the registered client, attackers can use the client_credentials grant with a self-signed JWT assertion to obtain access tokens granting read access to all FHIR resources across all patients in the system.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.005 (41.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Openemr — versions 0
Weakness classification (CWE)
References
- jivasecurity.com/writeups/openemr-unauth-oauth2-client-registration (technical-description, exploit)
- www.vulncheck.com/advisories/openemr-oauth2-dynamic-client-registration-unautho… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-67610?
- CVE-2026-67610 is a high-severity vulnerability in Openemr, classified under Missing Authentication for Critical Function. CVSS score: 8.1/10. Published 2026-08-03.
- How severe is CVE-2026-67610?
- High severity. CVSS v3 base score is 8.1 out of 10.