Summaryinfo

A vulnerability was found in OpenEMR up to 8.0.0.3. It has been declared as problematic. This affects an unknown part in the library portal/sign/lib/show-signature.php of the component Companion Write Endpoint. The manipulation of the argument User results in authorization. This vulnerability is known as CVE-2026-33934. It is possible to launch the attack remotely. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in OpenEMR up to 8.0.0.3. Affected is some unknown processing in the library portal/sign/lib/show-signature.php of the component Companion Write Endpoint. The manipulation of the argument user with an unknown input leads to a authorization vulnerability. CWE is classifying the issue as CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. This is going to have an impact on confidentiality. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-33934 since 03/24/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. There are known technical details, but no exploit is available.

By approaching the search of inurl:portal/sign/lib/show-signature.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 8.0.0.3 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch ae7ee1872d2e6300b165e24687cc90cf6847a4e5 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at CNNVD (CNNVD-202603-5523). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Business Process Management Software

Name

• OpenEMR

Version

• 8.0.0.0
• 8.0.0.1
• 8.0.0.2
• 8.0.0.3

License

• open-source

Website

• Product: https://github.com/openemr/openemr/

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