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.

• CWE-79
• CWE-1321

• https://github.com/livewire/livewire/commit/11ebe646f7e81dde2d714815da8b3019d058561e
• https://github.com/livewire/livewire/pull/10467
• https://github.com/livewire/livewire/releases/tag/v3.8.3
• https://github.com/livewire/livewire/releases/tag/v4.3.4
• https://github.com/livewire/livewire/security/advisories/GHSA-g3hc-697w-wm82

Published

Aug 31, 2026

Last Modified

Aug 31, 2026

Status

Received

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