Medium severity · published Aug 19, 2026
CVE-2026-40509
OpenEMR < 8.3.0 CSRF via DICOM Viewer web_path Parameter
4.3
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 9% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
openemr · openemr
before 8.3.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-40509
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-40509
vendor-advisory
https://github.com/openemr/openemr/security/advisories/GHSA-wffp-pj5h-xqwp
release-notes
https://github.com/openemr/openemr/releases/tag/v8_3_0
patch
https://github.com/openemr/openemr/commit/f760adc7bddaf9d118e1a0d40590e686783ed21b
third-party-advisory
https://www.vulncheck.com/advisories/openemr-csrf-via-dicom-viewer-web-path-parameter
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