CVE-2026-33934 Details
Description
OpenEMR is a free and open source electronic health records and medical practice management application. Versions prior to 8.0.0.3 have a missing authorization check in `portal/sign/lib/show-signature.php` that allows any authenticated patient portal user to retrieve the drawn signature image of any staff member by supplying an arbitrary `user` value in the POST body. The companion write endpoint (`save-signature.php`) was already hardened against this same issue, but the read endpoint was not updated to match. Version 8.0.0.3 patches the issue.
A missing authorization check in OpenEMR versions prior to 8.0.0.3 allows authenticated patient portal users to access the signature images of staff members. This is achieved by sending an arbitrary user value in the POST request to 'portal/sign/lib/show-signature.php'. While the corresponding write endpoint 'save-signature.php' has been secured, the read endpoint remains vulnerable. The issue arises because the '$user' variable is not properly validated or restricted, enabling unauthorized access to staff signatures.
Users can update to OpenEMR version 8.0.0.3, which addresses this vulnerability by implementing the necessary authorization checks in the 'show-signature.php' endpoint.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 26, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-639 | Authorization Bypass Through User-Controlled Key | [email protected] |
| CWE-862 | Missing Authorization | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| open-emr openemr | < 8.0.0.3 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Mar 26, 2026 | Initial Analysis | [email protected] |
| Mar 26, 2026 | New CVE Received | [email protected] |