Is CVE-2026-40509 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-40509?

CVE-2026-40509 has a CVSS v3 severity of MEDIUM (4.3).

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CVE-2026-40509

Description

OpenEMR before 8.3.0 contains a cross-site request forgery vulnerability in the DICOM viewer. The web_path GET parameter in the DICOM viewer page is embedded unsanitized as a URL without validation against expected path formats. An attacker can craft a URL that causes an authenticated user with Patients - Documents permissions to make authenticated requests to arbitrary OpenEMR endpoints, enabling forced logout and other state-changing actions.