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High

djust has Cross-Site Request Forgery on the Server-Sent-Events transport: a cross-origin page can drive a victim-authenticated SSE session

  • Disclosed: 16.09.2026
  • Updated: 11.10.2026 15:18

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.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Python (PyPI) djust < 1.0.7 1.0.7

References

CVSS score 8.1/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Weakness (CWE)
CWE-352
Platform
Python (PyPI)
Package
djust
Disclosed
16.09.2026
Updated
11.10.2026 15:18

Sources and licenses

OSV / GitHub Advisory Database - PYSEC-2026-4044 - PyPA Advisory Database; CC BY 4.0

OSV / GitHub Advisory Database - GHSA-pg97-jvmf-qfvc - CC BY 4.0

Vulnerability history: djust

All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (15) in the archive
Total entries
15
First → latest
08.2026 09.2026
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • Critical 1
  • High 11
  • Medium 3

Disclosures per year

Severity:
  1. djust: A template binding inherits a context safety grant it never earned (XSS)
    High ghsa-xjw9-38cr-6372 < 1.1.2 1.1.2
  2. djust: Six template-layer defects emit attacker-controlled markup unescaped (XSS)
    High ghsa-9395-2g46-rj3f < 1.1.1 1.1.1
  3. djust has an unauthenticated arbitrary module import via the WebSocket/SSE view-mount path
    High CVE-2026-61599 < 1.0.7 1.0.7
  4. djust has broken object-level access control (IDOR)
    High · 7.1 CVE-2026-61596 < 1.0.7 1.0.7
  5. djust has an authorization bypass on the WebSocket/SSE mount path
    Critical · 9.1 CVE-2026-61594 < 1.0.7 1.0.7
  6. djust: Unsigned client state snapshot is restored as trusted view state (privilege escalation / state injection)
    High · 8.1 CVE-2026-61591 < 1.0.7 1.0.7
  7. djust: SSE sessions are not bound to the authenticated user; the client-chosen session_id is the sole authorization capability (session hijack)
    High · 7.4 CVE-2026-61592 < 1.0.7 1.0.7
  8. djust has Cross-Site Request Forgery on the Server-Sent-Events transport: a cross-origin page can drive a victim-authenticated SSE session this entry
    High · 8.1 CVE-2026-61593 < 1.0.7 1.0.7
  9. djust: Multi-tenant isolation fails open on the WebSocket/SSE path, disclosing other tenants' data
    High · 7.7 CVE-2026-61595 < 1.0.7 1.0.7
  10. djust: Client mass-assignment of arbitrary view attributes via the default dj-model update_model handler
    High CVE-2026-61598 < 1.0.7 1.0.7
  11. djust's observability endpoints are network-exposed: the localhost gate is an opt-in middleware the docs omit, and the views enforce only DEBUG
    High · 7.4 CVE-2026-61590 < 1.0.7 1.0.7
  12. djust authentication bypass: a login_required / on_mount LiveView mount redirect does not close the WebSocket, allowing an unauthenticated client to dispatch event-handler calls
    High · 8.2 CVE-2026-55571 < 1.0.4 1.0.4

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