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PatchSiren cyber security CVE debrief

CVE-2026-46518 openemr CVE debrief

CVE-2026-46518 is a high-severity vulnerability in OpenEMR, a free and open-source electronic health records application. A stored cross-site scripting (XSS) vulnerability exists in the prescription CSS/HTML multi-print feature, allowing a patient portal user to execute arbitrary JavaScript in a clinician's browser session. This is possible because patient demographic fields (name, address) are rendered without output encoding in multiprintcss_header(), and portal patients can write attacker-controlled HTML directly into patient_data by calling the PUT api/patient/:num endpoint, bypassing the intended audit review workflow. The attacker can access CSRF tokens, session data, and perform actions as the clinician, crossing the patient-to-clinician trust boundary. The vulnerability has been patched in version 8.0.0.1.

Vendor
openemr
Product
Unknown
CVSS
HIGH 7.7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-10
Original CVE updated
2026-06-11
Advisory published
2026-06-10
Advisory updated
2026-06-11

Who should care

Clinicians and administrators using OpenEMR versions prior to 8.0.0.1 should be aware of this vulnerability and take immediate action to patch their systems.

Technical summary

A stored cross-site scripting (XSS) vulnerability exists in the prescription CSS/HTML multi-print feature of OpenEMR. Patient demographic fields are rendered without output encoding, and portal patients can write attacker-controlled HTML directly into patient_data. This allows a patient portal user to execute arbitrary JavaScript in a clinician's browser session, potentially leading to unauthorized actions.

Defensive priority

High

Recommended defensive actions

  • Upgrade to OpenEMR version 8.0.0.1 or later.
  • Review and restrict access to the PUT api/patient/:num endpoint.
  • Implement additional security measures to prevent cross-site scripting (XSS) attacks.

Evidence notes

CVE-2026-46518 has a CVSS score of 7.7 and is classified as HIGH severity. The vulnerability was published on 2026-06-10T00:16:53.960Z and modified on 2026-06-11T18:23:27.613Z.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-46518 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-46518

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-46518 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-46518

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.