CVE-2026-33302: OpenEMR: zhAclCheck Ignores Explicit ACL Denies
OpenEMR is a free and open source electronic health records and medical practice management application. Prior to 8.0.0.2, the module ACL function AclMain::zhAclCheck() only checks for the presence of any "allow" (user or group). It never checks for explicit "deny" (allowed=0). As a result, administrators cannot revoke access by setting a user or group to "deny"; if the user is in a group that has "allow," access is granted regardless of explicit denies. Version 8.0.0.2 fixes the issue.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2026-33302?
CVE-2026-33302 has a high severity level due to its potential to bypass access control restrictions.
How do I fix CVE-2026-33302?
To fix CVE-2026-33302, upgrade OpenEMR to version 8.0.0.2 or higher.
What applications are affected by CVE-2026-33302?
CVE-2026-33302 affects all versions of OpenEMR prior to 8.0.0.2.
What impact does CVE-2026-33302 have on data security?
CVE-2026-33302 allows unauthorized access to restricted data, compromising patient confidentiality.
Is CVE-2026-33302 already exploited in the wild?
As of now, there are no confirmed reports of CVE-2026-33302 being actively exploited.