Is this vulnerability remotely exploitable?

Yes, but only by authenticated users. A remote user with valid credentials can leverage the flawed ACL logic to retain or gain access to resources that administrators attempted to deny, provided they are in a group with an "allow" rule.

What level of access does an attacker need to exploit this issue?

The attacker must already have a valid OpenEMR account and be assigned to at least one group that has an "allow" entry for the targeted resource. No special administrative privileges are required beyond that membership.

What is the safest general fix pattern for this type of vulnerability?

Implement a consistent authorization model where explicit denies are evaluated and given precedence over allows, centralize all ACL checks in a single trusted function, and add tests that verify deny rules actually revoke access even when allow rules are present.

Severity:

HIGH RISK

(8.1)

Incorrect Authorization Logic (CWE-863) in OpenEMR ACL Deny Handling

CVE-2026-33302

Published:

Mar 19, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

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CWE-918

HIGH RISK

HIGH

(8.6)

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Unauthorized Access to Internal Resources via SSRF

May 6, 2026

CWE-863

HIGH RISK

HIGH

(8.8)

Authorization Bypass (CWE-863) in OpenClaw Matrix Room Control Commands

Privilege Escalation via Bypassed Access Control

May 6, 2026

Vulnerability Type

Category:

Incorrect Authorization

CWE:

CWE-863

Impact:

Privilege Bypass / Unauthorized Access

Severity:

HIGH RISK

(8.1)

CVSS Version:

3.1

Vulnerability Type

Category:

Incorrect Authorization

CWE:

CWE-863

Impact:

Privilege Bypass / Unauthorized Access

Severity:

HIGH RISK

(8.1)

CVSS Version:

3.1

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Incorrect Authorization Logic (CWE-863) in OpenEMR ACL Deny Handling

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(8.6)

Server-Side Request Forgery (CWE-918) in OpenClaw Zalo Plugin sendPhoto

HIGH RISK

HIGH

(8.8)

Authorization Bypass (CWE-863) in OpenClaw Matrix Room Control Commands

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Ship clean & secure code faster

Ship clean & secure code faster

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