CVE-2026-61589: djust WebSocket/runtime Reconstructed Request Omits The Vulnerability

MODERATE
Advisory Identifier: GHSA-v9rj-xjfv-xj9r
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CVSS 6.3
CWE-639 CWE-348
Published
Advisory Summary

CVE-2026-61589 is a MODERATE (CVSS 6.3) websocket/runtime reconstructed request omits the vulnerability (CWE-639: Authorization Bypass Through User-Controlled Key) affecting djust libraries in the PyPI ecosystem. The issue involves websocket/runtime reconstructed request omits the client host, causing host/subdomain tenantresolvers to misresolve the tenant on the live path. Remediation is available by upgrading affected packages to version 1.0.7.

CVE-2026-61589 at a Glance

CVE Identifier CVE-2026-61589
GHSA Identifier GHSA-v9rj-xjfv-xj9r
Severity MODERATE
CVSS v3.1 Base Score 6.3
CWE Classification CWE-639: Authorization Bypass Through User-Controlled Key
Affected Product djust
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 6.3

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

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
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-2026-61589

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-2026-61589, 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-639: Authorization Bypass Through User-Controlled Key, where the system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. 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 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 `TenantResolver`s 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`.

CVE-2026-61589 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-v9rj-xjfv-xj9r
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-2026-61589?
CVE-2026-61589 is a security vulnerability in djust involving WebSocket/runtime reconstructed request omits the client Host, causing host/subdomain TenantResolvers to misresolve the tenant on the live path under CWE-639: Authorization Bypass Through User-Controlled Key.
Which djust versions are affected?
Affected versions include releases prior to 1.0.7 across affected packages: djust.
What version fixes CVE-2026-61589?
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-2026-61589?
CVE-2026-61589 has a CVSS v3.1 base score of 6.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N.
What CWE is associated with CVE-2026-61589?
CVE-2026-61589 is classified under CWE-639: Authorization Bypass Through User-Controlled Key (The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.).
How can I check PyPI dependencies for CVE-2026-61589?
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-v9rj-xjfv-xj9r",
  "modified" : "2026-09-16T22:07:52Z",
  "published" : "2026-09-16T22:07:52Z",
  "aliases" : [ "CVE-2026-61589" ],
  "summary" : "djust: WebSocket/runtime reconstructed request omits the client Host, causing host/subdomain TenantResolvers to misresolve the tenant on the live path",
  "details" : "### Impact\nThe 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 `TenantResolver`s 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).\n\n### Patches\nFixed 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.\n\n### Workarounds\nNo workaround on the live path short of upgrading. Most exposed when combined with `STRICT_MODE=False`.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/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-v9rj-xjfv-xj9r"
  }, {
    "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-348", "CWE-639" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-09-16T22:07:52Z",
    "nvd_published_at" : null
  }
}