{"schemaVersion":3,"id":"CVE-2026-73208","aliases":["ALPINE-CVE-2026-73208","UBUNTU-CVE-2026-73208","DEBIAN-CVE-2026-73208"],"status":"published","duplicateOf":null,"title":null,"description":"An attacker that holds a token intended for a different purpose can authenticate, because when an OAuth2 token response does not contain a scope claim, the audience claim is used in its place and checked against the configured required scopes. These are different concepts, and the audience claim does not describe what a token is allowed to do. A token that grants no relevant permissions can be accepted because its intended recipient value happens to match a configured scope name, granting access that should have been denied. It also hides an identity provider misconfiguration where scopes are not being issued at all. Ensure the identity provider issues a scope claim for all tokens used with Dovecot, and that configured scope names do not match audience values. Update to non-vulnerable version. 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