Vulnerability Report

CVE-2026-33934

Title: Missing Authorization in Patient Portal Signature Retrieval

Auth Bypass

Proof Of Concept

No public PoC currently indexed for CVE-2026-33934.

CWE Category CWE-639
Published Date Mar 26, 2026
Modified Date Mar 26, 2026
Exploit Status Not Found
Score 4.3 CVSS v3.1
Exploit Probability (EPSS)
0.23%

Vulnerability Summary

CVE-2026-33934: 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.

Impacted Vendors

O
openemr 1
O
open-emr 1

Reference Links

https://github.com/openemr/openemr/commit/ae7ee1872d2e6300b165e24687cc90cf6847a4e5 https://github.com/openemr/openemr/releases/tag/v8_0_0_3 https://github.com/openemr/openemr/security/advisories/GHSA-w9w5-7x6h-657q
CVSS v3.1
Source Entity [email protected]
Severity MEDIUM
4.3
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-33934 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity LOW
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected Stack

No specific products linked.