What’s Vulnerable › Vulnerabilities

CVE-2026-40509: OpenEMR < 8.3.0 CSRF via DICOM Viewer web_path Parameter

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-19 · updated 2026-10-27
• Weakness: CWE-352

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.

Affected products

• openemr: before 8.3.0 — fixed in 8.3.0

How to fix

Upgrade to a fixed version: openemr 8.3.0. Check the vendor advisory for mitigations.

References

• https://github.com/openemr/openemr/commit/f760adc7bddaf9d118e1a0d40590e686783ed21b
• https://github.com/openemr/openemr/releases/tag/v8_3_0
• https://github.com/openemr/openemr/security/advisories/GHSA-wffp-pj5h-xqwp
• https://www.vulncheck.com/advisories/openemr-csrf-via-dicom-viewer-web-path-parameter

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