CVE-2026-103019 · Runtime
NO FIX YET · SEE WHAT TO DO
OpenEMR's logout handler redirects to an attacker-supplied URL before checking it against registered redirect URIs, and it does not verify the signature of the id_token_hint it reads. An attacker can craft a logout link on the real OpenEMR site that sends a user to an external page and ends their session.
first public Aug 18, 2026 · 1 source
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Organizations running OpenEMR 8.2.x or earlier with the REST API enabled are exposed to crafted logout links. Installations without the REST API enabled, or already on 8.3.0 or later, are not affected. Exploitation requires a user to click a link, and the attacker needs no account.
Not affected if rest-api-disabled, version-8.3.0-or-later
Who cares healthcare, openemr, php, self-hosted
version file in the install directory.8.3.0: move to 8.3.0.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.
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