CVE-2026-33302 OpenEMR: zhAclCheck Ignores Explicit ACL Denies
Attackers can bypass access controls in OpenEMR because explicit deny rules are ignored, allowing unauthorized access to restricted features.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-33302?
CVE-2026-33302 is a high-severity missing authorization vulnerability in Open-Emr Openemr, published on 19 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-863
Which versions are affected by CVE-2026-33302?
It affects 1 product.
Products include Open-Emr Openemr.
How do I fix CVE-2026-33302?
No fix has been published for CVE-2026-33302 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-33302 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33302 exists.
Other vulnerabilities in Open-Emr Openemr
- CVE-2026-24898 OpenEMR has an Unauthenticated MedEx Token Disclosure
- CVE-2026-24849 OpenEMR Arbitrary File Read Vulnerability
- CVE-2026-24908 OpenEMR has SQL Injection in Patient API Sort Parameter
- CVE-2022-2734 Improper Restriction of Rendered UI Layers or Frames in openemr/openemr
- CVE-2024-22611 SQL injection in n/a
Sources
Also known as GHSA-v68v-pwc4-8p2m.