Threats Tagged 'cve-2026-53728'
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Threats Tagged 'cve-2026-53728'
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Core: Medplum: Improper Validation of Redirect URI in External Auth Callback allows Authorization Code Leakage (CVE-2026-53728)CVE-2026-53728 0 Medplum versions prior to 5.1.6 contain a vulnerability in the external identity provider callback at GET /auth/external, where redirect URIs are improperly validated using a prefix match instead of an exact match. This allows an attacker to supply a malicious redirect URI that starts with a registered URI but points to an attacker-controlled domain, causing authorization codes to be leaked via redirection. The vulnerability enables an attacker to intercept authorization codes and potentially perform a full account takeover of users authenticating via the external IdP flow. Join the discussion | GCVE Database | 08/17/2026, 13:36:17 UTC Added: 08/17/2026, 16:14:12 UTC |
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