EUVD-2026-81306
GHSA-v9rj-xjfv-xj9r
Severity by source
AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
Network live-path access with authenticated mount (PR:L); AC:H because impactful disclosure needs multi-tenant host resolvers plus non-default STRICT_MODE=False; S:C for crossed tenant boundary, C:H disclosure only, no integrity/availability impact.
Primary rating from Vendor (https://github.com/djust-org/djust).
CVSS VectorVendor: https://github.com/djust-org/djust
Lifecycle Timeline
3DescriptionCVE.org
Impact
The WebSocket handle_mount and ViewRuntime._build_request rebuild an HttpRequest via RequestFactory().get(...) with no HTTP_HOST, so request.get_host() defaulted to "testserver" on the live path. Host/subdomain/domain TenantResolvers then misresolved the tenant - None on the live path while the HTTP path resolved correctly. With STRICT_MODE=False the tenant-scoped managers returned unscoped rows (cross-tenant disclosure); with the default they returned an empty queryset (broken tenancy).
Patches
Fixed in djust 1.0.7. The handshake Host is extracted from the ASGI scope, validated against ALLOWED_HOSTS (the same logic as the CSWSH Origin gate, parsed with Django's split_domain_port so malformed Hosts are rejected at the boundary), and propagated - with the TLS scheme - into the reconstructed request, so live-path tenant resolution matches HTTP exactly.
Workarounds
No workaround on the live path short of upgrading. Most exposed when combined with STRICT_MODE=False.
AnalysisAI
Cross-tenant data exposure on the djust live WebSocket path affects installations before 1.0.7 that use host-, subdomain-, or domain-based TenantResolvers for multi-tenancy. Because the request rebuilt by handle_mount and ViewRuntime._build_request carries no client Host, get_host() falls back to "testserver", so the tenant resolves to None on the live path even though the ordinary HTTP path resolves it correctly; with STRICT_MODE=False the tenant-scoped managers then return unscoped rows and an authenticated user can read other tenants' data. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires a djust deployment (version < 1.0.7) configured for multi-tenancy using host-, subdomain-, or domain-based TenantResolvers, AND the setting STRICT_MODE=False for the cross-tenant DISCLOSURE outcome; with the default STRICT_MODE the same flaw only breaks tenancy (empty queryset), not leaks. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a moderate-severity, low-real-priority multi-tenancy flaw. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: djust 1.0.7. … Detailed patch versions, workarounds, and compensating controls in full report. |
Threat intelligence, references, and detailed analysis are available after sign-in.
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External POC / Exploit Code
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