CVE-2026-61595 - djust: Multi-tenant isolation fails open on the WebSocket/SSE path, disclosing other tenants' data

CVE-2026-61595 - djust: Multi-tenant isolation fails open on the WebSocket/SSE path, disclosing other tenants' data

https://cvefeed.io/rssfeed/latest.atom / Wed, 09/16/2026 - 19:32
CVE ID :CVE-2026-61595
Published : Sept. 16, 2026, 4:17 p.m. | 51 minutes ago
Description :djust provides Phoenix LiveView-style reactive server-side rendering for Django with Rust-powered performance. Prior to version 1.0.7, `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. This issue is 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`. No known workarounds are available on the live path.
Severity: 7.7 | HIGH
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