SEPTEMBER 17, 2026
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Case File

CVE-2026-81887

MEDIUM · CVSS 5.1 EPSS 0.50% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-08-31 · Last synced 2026-09-17

CyberRota Analysis

AI-Generated

The vulnerability affects the Livewire framework for Laravel, specifically versions 3.0.0-beta.1 through 3.8.3 and 4.3.4, allowing unauthenticated attackers to exploit the dot-notated query-string parser to execute arbitrary JavaScript in the context of the affected application. This exploitation requires user interaction and can lead to unauthorized manipulation of client-side state, but does not bypass server-side authorization. Organizations using affected versions should prioritize updating to versions 3.8.3 or 4.3.4 to mitigate this risk.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Detected Signals
exploit

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-81887
Severity
MEDIUM
CVSS
5.1
EPSS
0.50%
Java

Original NVD 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.