CVE-2026-40509

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreHIGH confidence

Score 4.3 from GitHub Security Advisory published 2026-08-19. a secondary CVSS source baseline 4.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, secondary
Trending — 4 sources updated this week
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.3Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
4.3
EG Score
4.3(high)
EG Risk
34(Track)
EG Risk 34/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity43% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

August 19, 2026

Last Modified

August 20, 2026

Advisory Details (4)

Auto-updated Aug 19, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github, github_release.
generic

OpenEMR < 8.3.0 CSRF via DICOM Viewer web_path Parameter | Advisories | VulnCheck

https://www.vulncheck.com/advisories/openemr-csrf-via-dicom-viewer-web-path-parameter
github_commit Patch Available

commit f760adc7bdda (openemr/openemr)

Patch available: openemr/openemr v8_3_0 (contains commit f760adc7bdda)

https://github.com/openemr/openemr/commit/f760adc7bddaf9d118e1a0d40590e686783ed21b
github_release Patch Available

OpenEMR 8.3.0

Patch available: openemr/openemr v8_3_0

https://github.com/openemr/openemr/releases/tag/v8_3_0
github Patch Available🟡 PoC Available

/library/dicom_frame.php web_path Cross-Site Request Forgery · Advisory · openemr/openemr · GitHub

https://github.com/openemr/openemr/security/advisories/GHSA-wffp-pj5h-xqwp

Vendor Advisories for CVE-2026-40509(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 10× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-20 16:37 UTCEG score recompute
  3. 2026-08-20 16:37 UTCGHSA enrichment
  4. 2026-08-20 15:45 UTCEG score recompute
  5. 2026-08-20 15:45 UTCGHSA enrichment
  6. 2026-08-20 14:40 UTCEG score recompute
  7. 2026-08-20 14:40 UTCGHSA enrichment
  8. 2026-08-19 15:24 UTCEG score recompute
  9. 2026-08-19 15:09 UTCEG score recompute
  10. 2026-08-19 15:07 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-40509?
CVE-2026-40509 is a medium vulnerability published on August 19, 2026. 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…
When was CVE-2026-40509 disclosed?
CVE-2026-40509 was first published in the National Vulnerability Database on August 19, 2026, with the most recent update on August 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40509 actively exploited?
CVE-2026-40509 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 97.1% of all scored CVEs.
What is the CVSS score of CVE-2026-40509?
CVE-2026-40509 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-40509?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40509, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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