Cross-Site Request Forgery Vulnerability in OpenEMR DICOM Viewer
CVE-2026-40509

5.3MEDIUM

Key Information:

Vendor

Openemr

Status
Openemr
Vendor
CVE Published:
19 August 2026

What is CVE-2026-40509?

OpenEMR versions before 8.3.0 are vulnerable to a cross-site request forgery (CSRF) in the DICOM viewer, allowing attackers to leverage the unsanitized web_path GET parameter. By crafting a malicious URL, an attacker could exploit authorized users with 'Patients - Documents' permissions to make unwanted requests to OpenEMR's endpoints. This could result in actions such as forced logout or other unauthorized state changes that compromise user integrity and security.

Affected Version(s)

openemr 0

References

https://github.com/openemr/openemr/security/advisories/GH...
vendor-advisory
https://github.com/openemr/openemr/releases/tag/v8_3_0
release-notes
https://github.com/openemr/openemr/commit/f760adc7bddaf9d...
patch

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Alex Williams from Pellera Technologies
VulnCheck
.