CVE-2026-61595: djust Multi-tenant Isolation Fails Open On Vulnerability

HIGH
Advisory Identifier: GHSA-3492-cvg7-9mr2
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CVSS 7.7
CWE-862 CWE-636
Published
Advisory Summary

CVE-2026-61595 is a HIGH (CVSS 7.7) multi-tenant isolation fails open on vulnerability (CWE-862: Missing Authorization) affecting djust libraries in the PyPI ecosystem. The issue involves multi-tenant isolation fails open on the websocket/sse path, disclosing other tenants' data. Remediation is available by upgrading affected packages to version 1.0.7.

CVE-2026-61595 at a Glance

CVE Identifier CVE-2026-61595
GHSA Identifier GHSA-3492-cvg7-9mr2
Severity HIGH
CVSS v3.1 Base Score 7.7
CWE Classification CWE-862: Missing Authorization
Affected Product djust
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 7.7

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Changed (S:C)
Confidentiality High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-61595

To remediate this vulnerability, upgrade all affected djust dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

djust fixed: 1.0.7 
pip install djust>=1.0.7
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show djust

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-61595, inspect your installed packages using pip:

pip show djust

Analyze the terminal output to locate any version of djust in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.0.7), your application is affected.

Note: The pip show djust command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-862: Missing Authorization, where the product does not perform an authorization check when an actor attempts to access a resource or perform an action. In djust, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### 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.

CVE-2026-61595 Affected djust Versions

1 component(s)
Fixed Versions:
1.0.7
Product / Package Ecosystem Affected Versions Fixed Version
djust
pypi/djust
PyPI
< 1.0.7
1.0.7

References

GitHub Advisory / Wiki ADVISORY
https://github.com/djust-org/djust/security/advisories/GHSA-3492-cvg7-9mr2
djust Source Repository REPOSITORY
https://github.com/djust-org/djust
djust Release RELEASE
https://github.com/djust-org/djust/releases/tag/v1.0.7

Frequently Asked Questions

What is CVE-2026-61595?
CVE-2026-61595 is a security vulnerability in djust involving Multi-tenant isolation fails open on the WebSocket/SSE path, disclosing other tenants' data under CWE-862: Missing Authorization.
Which djust versions are affected?
Affected versions include releases prior to 1.0.7 across affected packages: djust.
What version fixes CVE-2026-61595?
Upgrading to 1.0.7 (or the latest patched release for your respective branch) resolves the vulnerability.
Is djust affected?
Yes, djust is affected in releases prior to 1.0.7. Upgrade your dependency to 1.0.7 or later.
What is the CVSS score of CVE-2026-61595?
CVE-2026-61595 has a CVSS v3.1 base score of 7.7 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.
What CWE is associated with CVE-2026-61595?
CVE-2026-61595 is classified under CWE-862: Missing Authorization (The product does not perform an authorization check when an actor attempts to access a resource or perform an action.).
How can I check PyPI dependencies for CVE-2026-61595?
Run the dependency tree command: 'pip show djust'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-3492-cvg7-9mr2",
  "modified" : "2026-09-16T15:32:10Z",
  "published" : "2026-09-16T15:32:10Z",
  "aliases" : [ "CVE-2026-61595" ],
  "summary" : "djust: Multi-tenant isolation fails open on the WebSocket/SSE path, disclosing other tenants' data",
  "details" : "### Impact\n`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.\n\n### Patches\nFixed 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`.\n\n### Workarounds\nNo workaround on the live path short of upgrading.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "djust"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.0.7"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/djust-org/djust/security/advisories/GHSA-3492-cvg7-9mr2"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/djust-org/djust"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/djust-org/djust/releases/tag/v1.0.7"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-636", "CWE-862" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-09-16T15:32:10Z",
    "nvd_published_at" : null
  }
}