{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-81887",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-08-27T17:48:42.123Z",
        "datePublished": "2026-08-31T20:12:15.932Z",
        "dateUpdated": "2026-09-03T18:03:10.981Z"
    },
    "containers": {
        "cna": {
            "title": "Livewire DOM-based cross-site scripting during client-side state handling",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-79",
                            "lang": "en",
                            "description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-1321",
                            "lang": "en",
                            "description": "CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "NONE",
                        "privilegesRequired": "NONE",
                        "userInteraction": "ACTIVE",
                        "vulnConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "NONE",
                        "vulnAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "LOW",
                        "subIntegrityImpact": "LOW",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 5.1,
                        "baseSeverity": "MEDIUM",
                        "vectorString": "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",
                        "version": "4.0"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/livewire/livewire/security/advisories/GHSA-g3hc-697w-wm82",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/livewire/livewire/security/advisories/GHSA-g3hc-697w-wm82"
                },
                {
                    "name": "https://github.com/livewire/livewire/pull/10467",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/livewire/livewire/pull/10467"
                },
                {
                    "name": "https://github.com/livewire/livewire/commit/11ebe646f7e81dde2d714815da8b3019d058561e",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/livewire/livewire/commit/11ebe646f7e81dde2d714815da8b3019d058561e"
                },
                {
                    "name": "https://github.com/livewire/livewire/releases/tag/v3.8.3",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/livewire/livewire/releases/tag/v3.8.3"
                },
                {
                    "name": "https://github.com/livewire/livewire/releases/tag/v4.3.4",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/livewire/livewire/releases/tag/v4.3.4"
                }
            ],
            "affected": [
                {
                    "vendor": "livewire",
                    "product": "livewire",
                    "versions": [
                        {
                            "version": ">= 3.0.0-beta.1, < 3.8.3",
                            "status": "affected"
                        },
                        {
                            "version": ">= 4.0.0-beta.1, < 4.3.4",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-08-31T20:12:15.932Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "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": {
                "advisory": "GHSA-g3hc-697w-wm82",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-09-03T18:03:04.888165Z",
                                "id": "CVE-2026-81887",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-09-03T18:03:10.981Z"
                }
            }
        ]
    }
}