CVE-2026-61593: Djust A Cross-origin Page Can Drive Vulnerability

HIGH
Advisory Identifier: GHSA-pg97-jvmf-qfvc
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CVSS 8.1
CWE-352
Published
Advisory Summary

CVE-2026-61593 is a HIGH (CVSS 8.1) a cross-origin page can drive vulnerability (CWE-352: Cross-Site Request Forgery (CSRF)) affecting Djust libraries in the PyPI ecosystem. The issue involves a cross-origin page can drive a victim-authenticated sse session. Remediation is available by upgrading affected packages to version 1.0.7.

CVE-2026-61593 at a Glance

CVE Identifier CVE-2026-61593
GHSA Identifier GHSA-pg97-jvmf-qfvc
Severity HIGH
CVSS v3.1 Base Score 8.1
CWE Classification CWE-352: Cross-Site Request Forgery (CSRF)
Affected Product Djust
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 8.1

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

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

How to Fix CVE-2026-61593

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-2026-61593, 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-352: Cross-Site Request Forgery (CSRF), where the web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor. 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 SSE client→server POST endpoints are `@csrf_exempt` and the SSE GET stream endpoint had no Origin check, so a cross-origin page could drive a victim-cookie-authenticated SSE session: force the victim's browser to GET the stream URL (which **creates and mounts** a LiveView as the victim) and POST to the message endpoint with `credentials: include` to **fire state-changing event handlers as the victim**. The URL `session_id` is client-chosen (validated only for UUID *format*), so it is not a CSRF token, and a JSON body sent as `text/plain` is a CORS *simple request* with no preflight. ### Patches Fixed in **djust 1.0.7**. All three SSE endpoints validate the request `Origin` against `ALLOWED_HOSTS` (mirroring the WebSocket CSWSH defense) and reject cross-origin requests with **403**; the POST endpoints additionally require `Content-Type: application/json` (**415** otherwise), closing the `text/plain` simple-request bypass. ### Workarounds Disable the SSE transport, or front it with a proxy that enforces an Origin allowlist.

CVE-2026-61593 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-pg97-jvmf-qfvc
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-2026-61593?
CVE-2026-61593 is a security vulnerability in Djust involving a cross-origin page can drive a victim-authenticated SSE session under CWE-352: Cross-Site Request Forgery (CSRF).
Which Djust versions are affected?
Affected versions include releases prior to 1.0.7 across affected packages: djust.
What version fixes CVE-2026-61593?
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-2026-61593?
CVE-2026-61593 has a CVSS v3.1 base score of 8.1 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.
What CWE is associated with CVE-2026-61593?
CVE-2026-61593 is classified under CWE-352: Cross-Site Request Forgery (CSRF) (The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.).
How can I check PyPI dependencies for CVE-2026-61593?
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-pg97-jvmf-qfvc",
  "modified" : "2026-09-16T15:45:03Z",
  "published" : "2026-09-16T15:45:03Z",
  "aliases" : [ "CVE-2026-61593" ],
  "summary" : "djust has Cross-Site Request Forgery on the Server-Sent-Events transport: a cross-origin page can drive a victim-authenticated SSE session",
  "details" : "### Impact\nThe SSE client→server POST endpoints are `@csrf_exempt` and the SSE GET stream endpoint had no Origin check, so a cross-origin page could drive a victim-cookie-authenticated SSE session: force the victim's browser to GET the stream URL (which **creates and mounts** a LiveView as the victim) and POST to the message endpoint with `credentials: include` to **fire state-changing event handlers as the victim**. The URL `session_id` is client-chosen (validated only for UUID *format*), so it is not a CSRF token, and a JSON body sent as `text/plain` is a CORS *simple request* with no preflight.\n\n### Patches\nFixed in **djust 1.0.7**. All three SSE endpoints validate the request `Origin` against `ALLOWED_HOSTS` (mirroring the WebSocket CSWSH defense) and reject cross-origin requests with **403**; the POST endpoints additionally require `Content-Type: application/json` (**415** otherwise), closing the `text/plain` simple-request bypass.\n\n### Workarounds\nDisable the SSE transport, or front it with a proxy that enforces an Origin allowlist.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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-pg97-jvmf-qfvc"
  }, {
    "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-352" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-09-16T15:45:03Z",
    "nvd_published_at" : null
  }
}