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

Quick assessment

Affected
livewire livewire
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Livewire livewire是Livewire团队的一款全栈开发框架。 livewire 3.0.0-beta.1至3.8.3之前版本和4.0.0-beta.1至4.3.4之前版本存在安全漏洞，该漏洞源于点分查询字符串解析器接受__proto__、constructor和prototype路径段并创建继承对象，且客户端状态处理器未正确验证属性所有权，可能导致未经身份验证的攻击者通过构造恶意URL，在用户打开时于受影响应用程序源中执行任意JavaScript。

CVSS 5.1 · Medium EPSS 0.68% · P51

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 2

VendorProduct Version RangeStatus
livewire livewire >= 3.0.0-beta.1, < 3.8.3 affected
>= 4.0.0-beta.1, < 4.3.4 affected
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I. Basic Information for CVE-2026-81887

Vulnerability Information
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Vulnerability Title
Livewire DOM-based cross-site scripting during client-side state handling
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
livewire 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Livewire livewire是Livewire团队的一款全栈开发框架。 livewire 3.0.0-beta.1至3.8.3之前版本和4.0.0-beta.1至4.3.4之前版本存在安全漏洞，该漏洞源于点分查询字符串解析器接受__proto__、constructor和prototype路径段并创建继承对象，且客户端状态处理器未正确验证属性所有权，可能导致未经身份验证的攻击者通过构造恶意URL，在用户打开时于受影响应用程序源中执行任意JavaScript。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
livewire livewire >= 3.0.0-beta.1, < 3.8.3 -

II. Public POCs for CVE-2026-81887

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III. Intelligence Information for CVE-2026-81887

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Patches & Fixes for CVE-2026-81887 (2)

Vendor Advisories for CVE-2026-81887 (1)

Vendor Pages for CVE-2026-81887 (1)

IV. Related Vulnerabilities

Same product: livewire
Same vendor: livewire
Same weakness: CWE-79

V. Comments for CVE-2026-81887

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