djust-org djust up to 1.0.3 WebSocket Event LiveViewConsumer.handle_event improper authorization

Summaryinfo

A vulnerability labeled as critical has been found in djust-org djust up to 1.0.3. Affected by this issue is the function LiveViewConsumer.handle_event of the component WebSocket Event Handler. Such manipulation leads to improper authorization. This vulnerability is uniquely identified as CVE-2026-55571. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in djust-org djust up to 1.0.3 and classified as critical. Affected by this issue is the function LiveViewConsumer.handle_event of the component WebSocket Event Handler. The manipulation with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-55571 since 06/17/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1548.002.

Upgrading to version 1.0.4 eliminates this vulnerability.

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Productinfo

Vendor

• djust-org

Name

• djust

Version

• 1.0.0
• 1.0.1
• 1.0.2
• 1.0.3

Website

• Product: https://github.com/djust-org/djust/

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