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CVE-2026-55571— 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

Quick assessment

Affected
djust-org djust
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

djust 为 Django 提供了类似 Phoenix LiveView 风格的响应式服务端渲染，并借助 Rust 实现高性能。在 1.0.4 版本之前，当 、 或某个重定向的 钩子拒绝 LiveView 挂载时， 会发送一个形如 的帧，但在执行完毕后并未关闭 WebSocket 连接或清除 。浏览器客户端会遵循该重定向指令，但原始的 WebSocket 客户端可以忽略此重定向并保留已建立的挂载 socket。由于 未重新进行身份认证或权限校验，攻击者可通过发送 类型的帧，触发 装饰的方法，而无需有效的认证会话。

CVSS 8.2 · High EPSS 0.28% · P20

Affected Version Matrix 1

VendorProduct Version RangeStatus
djust-org djust < 1.0.4 affected
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I. Basic Information for CVE-2026-55571

Vulnerability Information
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Vulnerability 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
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
djust-org djust < 1.0.4 -

II. Public POCs for CVE-2026-55571

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III. Intelligence Information for CVE-2026-55571

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Patches & Fixes for CVE-2026-55571 (2)

Vendor Advisories for CVE-2026-55571 (1)

Other References for CVE-2026-55571 (1)

IV. Related Vulnerabilities

Same weakness: CWE-285

V. Comments for CVE-2026-55571

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