CVE-2026-103019
OpenEMR: Unauthenticated Open Redirect via OIDC End Session Endpoint
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| openemr openemr |
< 8.3.0 (affected) | CNA: GitHub_M |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 4.3 medium |
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N | CNA: GitHub_M |
| 3.1 / 4.3 medium |
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N | NVD: [email protected] |
Exploit evidence
- https://github.com/openemr/openemr/security/advisories/GHSA-5h9g-m7q2-pv45
exploit · ADP: CISA-ADP
References
- https://github.com/openemr/openemr/security/advisories/GHSA-5h9g-m7q2-pv45CNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/openemr/openemr/pull/13133CNA: GitHub_M · x_refsource_MISC
- https://github.com/openemr/openemr/commit/50f789fad45ada625fe8d0faf0c7a9c15ef52aa5CNA: GitHub_M · x_refsource_MISC
- https://github.com/openemr/openemr/releases/tag/v8_3_0CNA: GitHub_M · x_refsource_MISC
- https://github.com/openemr/openemr/security/advisories/GHSA-5h9g-m7q2-pv45ADP: CISA-ADP · exploit
- https://github.com/openemr/openemr/commit/50f789fad45ada625fe8d0faf0c7a9c15ef52aa5[email protected]
- https://github.com/openemr/openemr/pull/13133[email protected]
- https://github.com/openemr/openemr/releases/tag/v8_3_0[email protected]
- https://github.com/openemr/openemr/security/advisories/GHSA-5h9g-m7q2-pv45[email protected]
- https://github.com/openemr/openemr/security/advisories/GHSA-5h9g-m7q2-pv45134c704f-9b21-4f2e-91b3-4a467353bcc0
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