Medium 4.3HealthcarePublished Mar 25, 2026

CVE-2026-33934OpenEMR's Missing Authorization in show-signature.php Allows Portal Patients to Read Staff Signatures

Updated under an hour ago (2026-10-19 12:10 UTC)

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It affects openemr and 1 other product. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.41%, higher than 34% of scored CVEs.

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Exploited in the last 30 days

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.

CVSS: 4.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weakness (CWE): CWE-639, CWE-862
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.41% (percentile 34)
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Mar 26, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

openemr openemr openemr:openemr (from the name)	before 8.0.0.3	CNA record
open-emr openemr open-emr:openemr	before 8.0.0.3	NVD

References

https://github.com/openemr/openemr/security/advisories/GHSA-w9w5-7x6h-657qx-refsource-confirm, exploit, vendor-advisory
https://github.com/openemr/openemr/commit/ae7ee1872d2e6300b165e24687cc90cf6847a4e5x-refsource-misc, patch
https://github.com/openemr/openemr/releases/tag/v8_0_0_3x-refsource-misc, product

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.