OpenEMR up to 8.2.x Authentication interface/globals.php authUser information disclosure

Summaryinfo

A vulnerability, which was classified as problematic, has been found in OpenEMR up to 8.2.x. Affected by this issue is some unknown functionality of the file interface/globals.php of the component Authentication. The manipulation of the argument authUser leads to information disclosure. This vulnerability is listed as CVE-2026-103021. The attack may be initiated remotely. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in OpenEMR up to 8.2.x and classified as problematic. This issue affects an unknown functionality of the file interface/globals.php of the component Authentication. The manipulation of the argument authUser with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. The summary by CVE is:

OpenEMR is a free and open source electronic health records and medical practice management application. From 6.0.0 until 8.3.0, interface/globals.php uses the unauthenticated authUser login parameter to populate temp_authuserid and load that account's user_settings before authentication succeeds. Existing usernames can therefore cause an additional database query and may apply visible customized settings, while nonexistent usernames skip that behavior. A remote unauthenticated actor can use timing or page differences to enumerate valid accounts for later credential attacks. This issue is fixed in version 8.3.0.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-103021 since 09/29/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

By approaching the search of inurl:interface/globals.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 8.3.0 eliminates this vulnerability.

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Productinfo

Type

• Business Process Management Software

Name

• OpenEMR

Version

• 8.0
• 8.1
• 8.2

License

• open-source

Website

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

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