Vulnerability · Published Aug 19, 2026 · Assigned by VulnCheck

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

Medium 4.3

In plain English

A medium-severity cross-site request forgery in openemr from openemr. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities).

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.2%top 91.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
openemr	openemr	0 – before 8.3.0

Weakness: CWE-352 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

References

GitHub Security Advisory (GHSA-wffp-pj5h-xqwp) vendor-advisory
OpenEMR v8_3_0 Release Notes release-notes
Patch Commit patch
https://www.vulncheck.com/advisories/openemr-csrf-via-dicom-viewer-web-path-parameter third-party-advisory