Improper Neutralization of Special Elements in Output Used by a Downstream Component in OpenEMR - CVE-2026-33301
Published: April 23, 2026
Vulnerability identifier: #VU127341
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-33301
CWE-ID: CWE-74
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: OpenEMR
Affected software:
OpenEMR
OpenEMR
Detailed vulnerability description
The vulnerability allows a remote user to disclose sensitive information.
The vulnerability exists due to improper neutralization of special elements in output used by a downstream component in the Eye Exam PDF creation function when parsing Eye Exam form answers as HTML during PDF generation. A remote user can submit crafted form content containing a file:// image reference to disclose sensitive information.
Exploitation requires an account with the Notes - my encounters role and access to the Eye Exam form in a patient encounter.
How to mitigate CVE-2026-33301
Install security update from vendor's website.