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EUVD-2026-363594

fkie_cve-2026-81887

Livewire is a full-stack framework for Laravel. From 3.0.0-beta.1 until 3.8.3 and 4.3.4, the dot-notated query-string parser in js/plugins/history/index.js, including fromQueryString() and insertDotNotatedValueIntoData(), accepts the __proto__, constructor, and prototype path segments and creates inherited objects. Client-side state handlers then access effects.html, effects.js, effects.xjs, and effects.scripts without Object.prototype.hasOwnProperty.call(), allowing inherited attacker-controlled state to be treated as trusted effects. An unauthenticated attacker can craft a URL that, when opened by a user, executes arbitrary JavaScript in the affected application's origin. Exploitation requires user interaction and does not bypass server-side authorization or grant privileges beyond the affected user. This issue is fixed in versions 3.8.3 and 4.3.4.

GHSA-g3hc-697w-wm82 — Livewire DOM-based cross-site scripting during client-side state handling

Affected: Packagist: livewire/livewire

### Impact In Livewire v3 (≤ 3.8.2) and v4 (≤ 4.3.3), a vulnerability allows unauthenticated attackers to execute arbitrary JavaScript in the origin of an affected application in specific scenarios. The issue stems from how certain client-side component state is handled. This vulnerability does not affect prior major versions. Exploitation requires user interaction, but does not require authentication or prior access to the application. The issue does not bypass server-side authorisation and grants an attacker no privileges beyond those the affected user already holds.

### Patches This issue has been patched in Livewire v3.8.3 and v4.3.4. All users are strongly encouraged to upgrade to these versions or later as soon as possible.

### Workarounds There is no known workaround at this time. Users are strongly advised to upgrade to a patched version immediately.

WID-SEC-W-2026-3105 — Livewire: Schwachstelle ermöglicht Cross-Site Scripting

Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Livewire ausnutzen, um einen Cross-Site Scripting Angriff durchzuführen.