Cross-site scripting in OpenEMR - CVE-2026-33933
Published: April 23, 2026
Vulnerability identifier: #VU127360
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Green
CVE-ID: CVE-2026-33933
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: OpenEMR
Affected software:
OpenEMR
OpenEMR
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary JavaScript in an authenticated staff member's browser session.
The vulnerability exists due to cross-site scripting in library/custom_template/custom_template.php when handling a crafted URL containing the contextName parameter. A remote attacker can send a specially crafted URL to execute arbitrary JavaScript in an authenticated staff member's browser session.
User interaction is required, and exploitation depends on the victim opening the crafted URL.
How to mitigate CVE-2026-33933
Install security update from vendor's website.