Auth bypass in Open-Emr Openemr
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.
Vulnerability class: IDOR (Insecure Direct Object Reference)
EPSS: 0.002 (14.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
Affected products
- Open-emr Openemr
- Openemr — versions < 8.0.0.3
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Product, x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-33934?
- CVE-2026-33934 is a medium-severity vulnerability in Open-Emr Openemr, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.3/10. Published 2026-03-26.
- How severe is CVE-2026-33934?
- Medium severity. CVSS v3 base score is 4.3 out of 10.