---
id: CVE-2026-81887
title: Livewire is a full-stack framework for Laravel
summary: >-
  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
  __p…
severity: medium
cwe:
  - CWE-79
  - CWE-1321
vendor: livewire
product: livewire/livewire
affected:
  - 'livewire/livewire >= 3.0.0-beta.1, <= 3.8.2'
  - 'livewire/livewire >= 4.0.0-beta.1, <= 4.3.3'
patched:
  - livewire/livewire 3.8.3
  - livewire/livewire 4.3.4
published: '2026-08-31'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:09:13.080'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-81887'
references:
  - url: >-
      https://github.com/livewire/livewire/commit/11ebe646f7e81dde2d714815da8b3019d058561e
    label: security-advisories@github.com
  - url: 'https://github.com/livewire/livewire/pull/10467'
    label: security-advisories@github.com
  - url: 'https://github.com/livewire/livewire/releases/tag/v3.8.3'
    label: security-advisories@github.com
  - url: 'https://github.com/livewire/livewire/releases/tag/v4.3.4'
    label: security-advisories@github.com
  - url: >-
      https://github.com/livewire/livewire/security/advisories/GHSA-g3hc-697w-wm82
    label: security-advisories@github.com
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-81887'
  - url: 'https://github.com/advisories/GHSA-g3hc-697w-wm82'
tags:
  - nvd
  - ghsa
  - composer
epss: 0.00682
epssPercentile: 0.50418
aliases:
  - GHSA-g3hc-697w-wm82
ecosystem: composer
ingestedAt: '2026-09-02T14:45:29.884Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-81887)

Affected packages:

- `livewire/livewire >= 3.0.0-beta.1, <= 3.8.2`
- `livewire/livewire >= 4.0.0-beta.1, <= 4.3.3`

Patched in:

- `livewire/livewire 3.8.3`
- `livewire/livewire 4.3.4`

Source: https://github.com/advisories/GHSA-g3hc-697w-wm82