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The opt-in multi-user feature's only enforcement is web-layer scoping (all sessions share one OS account). An adversarial review found 8 critical + 7 high cross-user holes that defeated it, plus mediums; all fixed here. Single-user (flag-off) behavior stays byte-identical apart from documented consistency deltas. Ownership / confinement: - DELETE /api/sessions (bulk) + /:id now owner-scope / findSessionOrFail - quick-start, cron (create+fire), scheduled runs confine workingDir to the owner's space; case link/docker-link/docker-import confine the host path - resolveCasePath no longer resolves linked cases for non-admins; foreign remote/docker cases are skipped (fall through to the caller's own local case) - history, subagents/workflows, mux-sessions, orchestrator, cron run-history, away-digest, and remote/docker host reads are owner- or admin-scoped Permission policy (section 6.3): - non-granted users are downgraded at every spawn site incl. legacy /api/scheduled, PlanOrchestrator one-shots, remote launch, and the cron-fire gemini/codex bypass switches; resolveClaudeModeForUsername now fails closed Auth / store: - verify-first login throttle (a correct password is never locked out), /ws terminal subject to the change-password lockbox, cookie fast-path re-validates identity live, role/grant changes revoke sessions, admin delete runs the last-admin guard before any teardown - users.json: distinguish missing (ENOENT) from corrupt/unreadable so a bad read can't overwrite all accounts; unique per-process temp write path Event streams: - debounced session:updated + batched task:updated, clipboard, and push notifications route by owner (fail closed); getLightState hides machine-wide globalStats from non-admins Tests: two suites updated to assert the fixed (secure) behavior. tsc, eslint, and test:ci all green. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>