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

Quick assessment

Affected
openemr openemr
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenEMR是OpenEMR社区的一套开源的医疗管理系统。该系统可用于医疗实践管理、电子医疗记录、处方书写和医疗帐单申请。 OpenEMR 8.0.0.2之前版本存在安全漏洞，该漏洞源于模块ACL函数仅检查allow而忽略deny，可能导致管理员无法通过设置为deny来撤销访问权限。

AI Predicted 9.8 Difficulty: Easy EPSS 0.37% · P28

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2026-33302

Vulnerability Information
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Vulnerability Title
OpenEMR: zhAclCheck Ignores Explicit ACL Denies
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:P
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
OpenEMR 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenEMR是OpenEMR社区的一套开源的医疗管理系统。该系统可用于医疗实践管理、电子医疗记录、处方书写和医疗帐单申请。 OpenEMR 8.0.0.2之前版本存在安全漏洞，该漏洞源于模块ACL函数仅检查allow而忽略deny，可能导致管理员无法通过设置为deny来撤销访问权限。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
openemr openemr < 8.0.0.2 -

II. Public POCs for CVE-2026-33302

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III. Intelligence Information for CVE-2026-33302

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Patches & Fixes for CVE-2026-33302 (1)

Vendor Advisories for CVE-2026-33302 (1)

Same Patch Batch · openemr · 2026-03-19 · 12 CVEs total

CVE-2026-32238 9.1 CRITICAL OpenEMR has Remote Code Execution in backup functionality
CVE-2026-33346 8.7 HIGH OpenEMR has stored XSS in portal_payment.php via Unescaped table_args
CVE-2026-25928 6.5 MEDIUM OpenEMR Vulnerable to Path Traversal When Zipping DICOM Folders
CVE-2026-25744 6.5 MEDIUM OpenEMR: POST /api/.../vital Accepts Attacker-Supplied id and Overwrites Arbitrary Vitals
CVE-2026-33304 6.5 MEDIUM OpenEMR has Authorization Bypass in Dated Reminders Log
CVE-2026-33305 5.4 MEDIUM OpenEMR has Authorization Bypass in FaxSMS AppDispatch Constructor
CVE-2026-33303 5.4 MEDIUM OpenEMR Vulnerable to Stored XSS via Unescaped portal_login_username in Credential Print V
CVE-2026-32119 4.4 MEDIUM OpenEMR has Stored DOM XSS via SearchHighlight text-node reconstruction on Custom Report p
CVE-2026-33301 OpenEMR has arbitrary image file read via PDF generator
CVE-2026-33321 OpenEMR has Out-of-Band Server-Side Request Forgery (OOB SSRF)
CVE-2026-33299 OpenEMR has Stored XSS in patient encounter Eye Exam form answers

IV. Related Vulnerabilities

Same product: openemr
Same vendor: openemr
Same weakness: CWE-863

V. Comments for CVE-2026-33302

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