Is CVE-2026-103021 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-103021 being exploited in the wild.

How severe is CVE-2026-103021?

Medium severity, with a CVSS score of 5.3, published 5 November 2026.

Which products and versions are affected?

OpenEMR Project OpenEMR 6.0.0 to 8.3.0.

Is there a fix for CVE-2026-103021?

Yes: fixed in 8.3.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-103021 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-103021?

Check whether you run OpenEMR Project OpenEMR at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-103021: OpenEMR account enumeration via timing attack in pre-authentication

CVE-2026-103021 · Severity: medium · CVSS 5.3 · Published 2026-11-05

OpenEMR is an open-source electronic health records and medical practice management system used by healthcare providers. An unauthenticated attacker can determine whether specific user accounts exist by measuring response times or observing page differences, enabling them to build a list of valid usernames for targeted password attacks. This vulnerability affects versions 6.0.0 through 8.3.0.

Technologies: OpenEMR Project OpenEMR. Vendors: OpenEMR Project.

Quick answers

Is CVE-2026-103021 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-103021 being exploited in the wild.
How severe is CVE-2026-103021?: Medium severity, with a CVSS score of 5.3, published 5 November 2026.
Which products and versions are affected?: OpenEMR Project OpenEMR 6.0.0 to 8.3.0.
Is there a fix for CVE-2026-103021?: Yes: fixed in 8.3.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-103021 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-103021?: Check whether you run OpenEMR Project OpenEMR at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: 8.3.0

Technical details

The interface/globals.php file processes the authUser login parameter before authentication completes, causing the application to load user_settings and trigger database queries for valid usernames but not for invalid ones. This timing or behavioral difference allows account enumeration via unauthenticated network requests. The vulnerability stems from pre-authentication processing of user input that should only occur after successful login.

Affected products

OpenEMR Project OpenEMR 6.0.0 to 8.3.0

Timeline

2026-11-05: disclosed

References

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