{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "source": "REFERENCES"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "11ebe646f7e81dde2d714815da8b3019d058561e"
            }
          ],
          "repo": "https://github.com/livewire/livewire",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-g3hc-697w-wm82"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-1321",
      "CWE-79"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81887.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "3.0.0-beta.1"
          },
          {
            "fixed": "3.8.3"
          },
          {
            "introduced": "4.0.0-beta.1"
          },
          {
            "fixed": "4.3.4"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "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.",
  "id": "CVE-2026-81887",
  "modified": "2026-09-05T03:30:33.173809727Z",
  "published": "2026-08-31T20:12:15.932Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/livewire/livewire/releases/tag/v3.8.3"
    },
    {
      "type": "WEB",
      "url": "https://github.com/livewire/livewire/releases/tag/v4.3.4"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81887.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/livewire/livewire/security/advisories/GHSA-g3hc-697w-wm82"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-81887"
    },
    {
      "type": "FIX",
      "url": "https://github.com/livewire/livewire/commit/11ebe646f7e81dde2d714815da8b3019d058561e"
    },
    {
      "type": "FIX",
      "url": "https://github.com/livewire/livewire/pull/10467"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Livewire DOM-based cross-site scripting during client-side state handling"
}