CVE-2026-40509

Medium

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.

SeverityMedium

CVSS4.3

Exploit probability—

ProductOpenemr

PublishedAug 19, 2026

First seenAug 19, 2026

Weakness typeCWE-352Cross-site request forgery (CSRF)

How to fix

Update

openemr openemr8.3.0 or later

Patches

github.com/openemr/openemr/commit/f760adc7bddaf9d118e1a0d40590e686783ed21b

Vendor advisories

Affected products

Product	Affected versions	Fixed in
openemr openemr	v < 8.3.0	8.3.0

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