Authorization bypass through user-controlled key in OpenEMR - CVE-2026-33304
Published: April 23, 2026
Vulnerability identifier: #VU127327
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-2026-33304
CWE-ID: CWE-639
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 authorization bypass through user-controlled key in dated reminders log page when handling crafted GET requests with arbitrary sentTo[] or sentBy[] parameters. A remote user can send a specially crafted request to disclose sensitive information.
The issue exposes other users' reminder messages, including associated patient names and free-text message content.
How to mitigate CVE-2026-33304
Install security update from vendor's website.