Vulnerability-Lookup

CVE-2026-55571 (GCVE-0-2026-55571)

Vulnerability from cvelistv5 – Published: 2026-08-25 16:05 – Updated: 2026-08-25 17:56

Title

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

Summary

djust provides Phoenix LiveView-style reactive server-side rendering for Django with Rust-powered performance. Prior to 1.0.4, LiveViewConsumer.handle_mount sends a `{"type":"navigate","to":...}` frame when login_required, permission_required, or a redirecting on_mount hook denies a LiveView mount, but returns without closing the WebSocket or clearing self.view_instance. A browser follows the redirect, but a raw WebSocket client can ignore it and retain the mounted socket. Because LiveViewConsumer.handle_event does not recheck authentication or authorization, the client can send `{"type":"event",...}` frames that invoke @event_handler methods without an authenticated session, including through handle_live_redirect_mount, enabling unauthorized sensitive reads or mutations. This issue is fixed in version 1.0.4.

Severity

8.2 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-25 17:53 UTC

CWE

CWE-285 - Improper Authorization
CWE-306 - Missing Authentication for Critical Function

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/djust-org/djust/security/advis…	x_refsource_CONFIRM
https://github.com/djust-org/djust/pull/1780	x_refsource_MISC
https://github.com/djust-org/djust/commit/1ae8aa9…	x_refsource_MISC
https://github.com/djust-org/djust/releases/tag/v1.0.4	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
djust-org	djust	Affected: < 1.0.4	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-55571

Vulnerability from fkie_nvd - Published: 2026-08-25 17:17 - Updated: 2026-08-25 18:17

Severity

8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/djust-org/djust/commit/1ae8aa9246b80477de7ddc4d90319a3b267bef04
	security-advisories@github.com	https://github.com/djust-org/djust/pull/1780
	security-advisories@github.com	https://github.com/djust-org/djust/releases/tag/v1.0.4
	security-advisories@github.com	https://github.com/djust-org/djust/security/advisories/GHSA-xx4j-w367-7247
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/djust-org/djust/security/advisories/GHSA-xx4j-w367-7247

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "djust",
          "vendor": "djust-org",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.0.4"
            }
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    }
  ],
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      "value": "djust provides Phoenix LiveView-style reactive server-side rendering for Django with Rust-powered performance. Prior to 1.0.4, LiveViewConsumer.handle_mount sends a `{\"type\":\"navigate\",\"to\":...}` frame when login_required, permission_required, or a redirecting on_mount hook denies a LiveView mount, but returns without closing the WebSocket or clearing self.view_instance. A browser follows the redirect, but a raw WebSocket client can ignore it and retain the mounted socket. Because LiveViewConsumer.handle_event does not recheck authentication or authorization, the client can send `{\"type\":\"event\",...}` frames that invoke @event_handler methods without an authenticated session, including through handle_live_redirect_mount, enabling unauthorized sensitive reads or mutations. This issue is fixed in version 1.0.4."
    }
  ],
  "id": "CVE-2026-55571",
  "lastModified": "2026-08-25T18:17:55.963",
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GHSA-XX4J-W367-7247

Vulnerability from github – Published: 2026-08-25 16:06 – Updated: 2026-08-25 16:06

Summary

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

Details

Impact

djust's LiveViewConsumer mounts a LiveView over a WebSocket. When a view is gated (login_required / permission_required, or an on_mount hook that returns a redirect) and the connecting user is not authorized, the consumer sent the client a {"type":"navigate","to":...} redirect frame and then returned — without closing the socket and without clearing self.view_instance. Only the PermissionDenied branch closed the connection (close(4403)).

A real browser obeys the navigate frame and leaves, hiding the problem. A raw WebSocket client that ignores the redirect keeps an open, mounted socket. Because handle_event did not re-check authentication/authorization after mount, that client could then send {"type":"event", ...} frames and invoke any @event_handler method on the gated view with no authenticated session — an authentication bypass on the live mutation path.

Who is affected: apps that expose LiveViews gated by login_required / permission_required / a redirecting on_mount hook, where the gated view's event handlers perform sensitive reads or mutations and do not independently re-verify the user. Exploitation requires a non-browser WebSocket client and knowledge (or enumeration) of the view path and event names.

Patches

Fixed in djust 1.0.4 (commit 1ae8aa9, PR #1780). Both the auth-redirect and on_mount-hook-redirect branches of handle_mount now send the navigate frame and then close(code=4403) and clear self.view_instance, mirroring the existing PermissionDenied branch. Public / authorized mounts are unchanged. The same path is reachable via handle_live_redirect_mount (which delegates to handle_mount) and is covered by the same fix.

1.0.4 also adds an opt-in defense-in-depth control, LIVEVIEW_CONFIG['reauth_on_event'] = True (default OFF), which re-resolves the user from the session and re-runs the view's auth check on every event for gated views.

Workarounds

Upgrade to 1.0.4. If you cannot upgrade immediately, on affected versions ensure that every @event_handler on a gated LiveView independently verifies the request user is authenticated and authorized (e.g. check request.user.is_authenticated / permissions at the top of each handler), since the framework does not re-check after mount on < 1.0.4. Alternatively, override the consumer's handle_mount to await self.close(code=4403) after emitting an auth redirect.

Proof of concept

Using Channels' WebsocketCommunicator against LiveViewConsumer.as_asgi() with an anonymous scope, mount a login_required view: the server emits a navigate frame but the socket stays open. Sending a subsequent {"type":"event", "handler":"<mutating_handler>", ...} frame reaches the handler and executes it without an authenticated session. On 1.0.4 the socket is closed with code 4403 immediately after the redirect and the event frame is rejected. (Regression test: tests/test_ws_auth_close_socket.py.)

Credits

Discovered internally during the djust v1.1.0 WebSocket-auth security review.

Severity

8.2 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "djust"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
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            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-55571"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-285",
      "CWE-306"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-25T16:06:31Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Impact\n\ndjust\u0027s `LiveViewConsumer` mounts a `LiveView` over a WebSocket. When a view is gated (`login_required` / `permission_required`, or an `on_mount` hook that returns a redirect) and the connecting user is not authorized, the consumer sent the client a `{\"type\":\"navigate\",\"to\":...}` redirect frame and then `return`ed \u2014 **without closing the socket and without clearing `self.view_instance`**. Only the `PermissionDenied` branch closed the connection (`close(4403)`).\n\nA real browser obeys the navigate frame and leaves, hiding the problem. A **raw WebSocket client that ignores the redirect** keeps an open, mounted socket. Because `handle_event` did not re-check authentication/authorization after mount, that client could then send `{\"type\":\"event\", ...}` frames and invoke any `@event_handler` method on the gated view **with no authenticated session** \u2014 an authentication bypass on the live mutation path.\n\n**Who is affected:** apps that expose `LiveView`s gated by `login_required` / `permission_required` / a redirecting `on_mount` hook, where the gated view\u0027s event handlers perform sensitive reads or mutations and do not independently re-verify the user. Exploitation requires a non-browser WebSocket client and knowledge (or enumeration) of the view path and event names.\n\n### Patches\n\nFixed in **djust 1.0.4** (commit `1ae8aa9`, PR #1780). Both the auth-redirect and `on_mount`-hook-redirect branches of `handle_mount` now send the navigate frame **and then `close(code=4403)` and clear `self.view_instance`**, mirroring the existing `PermissionDenied` branch. Public / authorized mounts are unchanged. The same path is reachable via `handle_live_redirect_mount` (which delegates to `handle_mount`) and is covered by the same fix.\n\n1.0.4 also adds an opt-in defense-in-depth control, `LIVEVIEW_CONFIG[\u0027reauth_on_event\u0027] = True` (default OFF), which re-resolves the user from the session and re-runs the view\u0027s auth check on **every** event for gated views.\n\n### Workarounds\n\nUpgrade to 1.0.4. If you cannot upgrade immediately, on affected versions ensure that **every `@event_handler` on a gated `LiveView` independently verifies the request user is authenticated and authorized** (e.g. check `request.user.is_authenticated` / permissions at the top of each handler), since the framework does not re-check after mount on `\u003c 1.0.4`. Alternatively, override the consumer\u0027s `handle_mount` to `await self.close(code=4403)` after emitting an auth redirect.\n\n### Proof of concept\n\nUsing Channels\u0027 `WebsocketCommunicator` against `LiveViewConsumer.as_asgi()` with an **anonymous** scope, mount a `login_required` view: the server emits a `navigate` frame but the socket stays open. Sending a subsequent `{\"type\":\"event\", \"handler\":\"\u003cmutating_handler\u003e\", ...}` frame reaches the handler and executes it without an authenticated session. On 1.0.4 the socket is closed with code `4403` immediately after the redirect and the event frame is rejected. (Regression test: `tests/test_ws_auth_close_socket.py`.)\n\n### Credits\n\nDiscovered internally during the djust v1.1.0 WebSocket-auth security review.",
  "id": "GHSA-xx4j-w367-7247",
  "modified": "2026-08-25T16:06:32Z",
  "published": "2026-08-25T16:06:31Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/djust-org/djust/security/advisories/GHSA-xx4j-w367-7247"
    },
    {
      "type": "WEB",
      "url": "https://github.com/djust-org/djust/pull/1780"
    },
    {
      "type": "WEB",
      "url": "https://github.com/djust-org/djust/commit/1ae8aa9246b80477de7ddc4d90319a3b267bef04"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/djust-org/djust"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "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"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-55571 (GCVE-0-2026-55571)

FKIE_CVE-2026-55571

GHSA-XX4J-W367-7247

Impact

Patches

Workarounds

Proof of concept

Credits

Tags

Sightings

Nomenclature