CVE-2026-40509Public exploitNetwork attack vector

Forced actions via unsanitized web_path URL

Published Aug 19, 2026 · Updated Aug 20, 2026

Cross-site request forgery in the DICOM viewer in OpenEMR before 8.3.0 allows attackers to trigger authenticated requests via web_path. In /library/dicom_frame.php, the web_path GET parameter is placed into the viewer URL after only quote escaping, and the page did not require a CSRF token or verify that the value stayed within expected DICOM document paths. Reachability requires an authenticated user with Patients - Documents permissions to open a crafted link; the resulting browser request can force logout or other state-changing actions available to that session.

CVSS severity5.3
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Cross-site request forgery in the DICOM viewer in OpenEMR before 8.3.0 allows attackers to trigger authenticated requests via web_path. In /library/dicom_frame.php, the web_path GET parameter is placed into the viewer URL after only quote escaping, and the page did not require a CSRF token or verify that the value stayed within expected DICOM document paths. Reachability requires an authenticated user with Patients - Documents permissions to open a crafted link; the resulting browser request can force logout or other state-changing actions available to that session.

The record

CVE
CVE-2026-40509
Published
Aug 19, 2026
Updated
Aug 20, 2026
Vendor
OpenEMR Foundation
Product
OpenEMR
Classifications
CWE-352
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <8.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenEMR Foundation · OpenEMRversion=0 <8.3.0

Published CVSS scores

4.3VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
5.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo