What’s Vulnerable › Vulnerabilities

CVE-2026-33302: OpenEMR: zhAclCheck Ignores Explicit ACL Denies

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-19 · updated 2026-06-17
• Weakness: CWE-863

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.

Affected products

• openemr: before 8.0.0.2 — fixed in 8.0.0.2

How to fix

Upgrade to a fixed version: openemr 8.0.0.2. Check the vendor advisory for mitigations.

References

• https://github.com/openemr/openemr/commit/0ef9b1763029e52d43fcb4fd0ebb0769a7ec43d4
• https://github.com/openemr/openemr/security/advisories/GHSA-v68v-pwc4-8p2m

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