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CVE-2026-33934

OpenEMR's Missing Authorization in show-signature.php Allows Portal Patients to Read Staff Signatures

Published: Mar 25, 2026Updated: Mar 26, 2026 Sources: CVE List NVDCWE-639
4.3MEDIUM
NVD MITRE
EPSS Score
0.2%
Top 85.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-639CWE-862

Affected Products

openemropen-emr
On-premWeb App
Enterprise Software / document-mgmt
openemropenemr
On-premWeb App
Enterprise Software / itsm-monitoring
open-emross-projectUSEnterprise Softwareaka openemr
openemross-projectEnterprise Softwareaka openemr/openemr, openemr

Exploitability

Official Patch Available

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Initial Access
View detailed technique mapping

References

https://github.com/openemr/openemr/commit/ae7ee1872d2e6300b165e24687cc90cf6847a4e5
github.com
https://github.com/openemr/openemr/releases/tag/v8_0_0_3
github.com
https://github.com/openemr/openemr/security/advisories/GHSA-w9w5-7x6h-657q
github.com

Timeline

Published
Mar 25, 2026
Last Updated
Mar 26, 2026

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