# CVE-2026-103019: OpenEMR: Unauthenticated Open Redirect via OIDC End Session Endpoint

Status: published. Published: 2026-11-05. Updated: 2026-11-09.

OpenEMR is a free and open source electronic health records and medical practice management application. Prior to 8.3.0, userSessionLogout() in src/RestControllers/AuthorizationController.php uses decodeToken() to process an id_token_hint without verifying its signature and, when the referenced trusted session is absent, redirects to the caller-supplied post_logout_redirect_uri before validating it against the client's registered redirect URIs. An unauthenticated attacker can craft a logout link that sends a user to an arbitrary external site and invalidates the user's session, enabling convincing phishing flows from the legitimate logout endpoint. The endpoint is reachable when the OpenEMR REST API is enabled. This issue is fixed in version 8.3.0.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- openemr / openemr: < 8.3.0 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 4.3 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N; source: CNA: GitHub_M

- CVSS 3.1: 4.3 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N; source: NVD: security-advisories@github.com

- CISA KEV: No listing in collected sources

- EPSS: 0.26% as of 2026-11-09; percentile 18.27%

- SSVC: exploitation poc; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-601

## Exploit evidence

- exploit: https://github.com/openemr/openemr/security/advisories/GHSA-5h9g-m7q2-pv45 (ADP: CISA-ADP)

## References

- https://github.com/openemr/openemr/security/advisories/GHSA-5h9g-m7q2-pv45 (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/openemr/openemr/pull/13133 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/openemr/openemr/commit/50f789fad45ada625fe8d0faf0c7a9c15ef52aa5 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/openemr/openemr/releases/tag/v8_3_0 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/openemr/openemr/security/advisories/GHSA-5h9g-m7q2-pv45 (ADP: CISA-ADP; exploit)

- https://github.com/openemr/openemr/commit/50f789fad45ada625fe8d0faf0c7a9c15ef52aa5 (security-advisories@github.com)

- https://github.com/openemr/openemr/pull/13133 (security-advisories@github.com)

- https://github.com/openemr/openemr/releases/tag/v8_3_0 (security-advisories@github.com)

- https://github.com/openemr/openemr/security/advisories/GHSA-5h9g-m7q2-pv45 (security-advisories@github.com)

- https://github.com/openemr/openemr/security/advisories/GHSA-5h9g-m7q2-pv45 (134c704f-9b21-4f2e-91b3-4a467353bcc0)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-103019; retrieved 2026-11-09; source updated 2026-11-09

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-103019; retrieved 2026-11-10; source updated 2026-11-09

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-103019; retrieved 2026-11-09; source updated Not reported

Revision: b0a2944ab0d7c3401a2282522b5096553c91385d97b6a9bd51488db90cbae574

Canonical: https://y2.dev/cve/CVE-2026-103019

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