CVE-2026-81887

CVE-2026-81887 · Livewire DOM-based cross-site scripting during client-side state handling

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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.

CVSS 5.1 · Mittel · EPSS 0,7% · Korrektur verfügbar

Veröffentlicht

2026-08-31T20:12:15.932Z

Aktualisiert

2026-09-03T18:03:10.981Z

Technologie-Stack: php

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