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HIGH7.7

PYSEC-2026-4036

djust: Multi-tenant isolation fails open on the WebSocket/SSE path, disclosing other tenants' data

Quick fix

PYSEC-2026-4036 — djust: upgrade to the fixed version with the command below.

pip install --upgrade 'djust>=1.0.7'

Details

### Impact `djust.tenants` isolation was enforced only on the HTTP path. The current tenant was stored in `threading.local()` and set exclusively by the HTTP-only `TenantMiddleware`, so on the live (WebSocket/SSE) path `get_current_tenant()` was always `None` during mount and every event handler — and the tenant-aware `QuerySet` manager failed **OPEN** (returned the unfiltered queryset, ignoring `STRICT_MODE`), disclosing **every** tenant's rows to whoever held the socket. `threading.local` was additionally shared across connections on the `sync_to_async` executor thread.

### Patches Fixed in **djust 1.0.7**. Tenant storage moved to a `contextvars.ContextVar` (per async task); the resolved tenant is bound around WS/SSE mount and every dispatch; both managers scope the base queryset once and fail **CLOSED** (`.none()` under the default `STRICT_MODE`); and system check **S006** warns when `STRICT_MODE=False`.

### Workarounds No workaround on the live path short of upgrading.

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI/djust
Introduced in: 0Fixed in: 1.0.7
Fixpip install --upgrade 'djust>=1.0.7'

References