CVE-2026-81887 (GCVE-0-2026-81887)

Vulnerability from cvelistv5 – Published: 2026-08-31 20:12 – Updated: 2026-08-31 20:12
VLAI
Title
Livewire DOM-based cross-site scripting during client-side state handling
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 __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.
Severity
5.1 (Medium)
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
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
  • CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Assigner
References
Impacted products
Vendor Product Version CPE status
livewire livewire Affected: >= 3.0.0-beta.1, < 3.8.3
Affected: >= 4.0.0-beta.1, < 4.3.4
guessed Create a notification for this product.
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "livewire",
          "vendor": "livewire",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 3.0.0-beta.1, \u003c 3.8.3"
            },
            {
              "status": "affected",
              "version": "\u003e= 4.0.0-beta.1, \u003c 4.3.4"
            }
          ]
        }
      ],
      "descriptions": [
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          "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\u0027s 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."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 5.1,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "LOW",
            "subIntegrityImpact": "LOW",
            "userInteraction": "ACTIVE",
            "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",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
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              "cweId": "CWE-79",
              "description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
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        {
          "descriptions": [
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              "cweId": "CWE-1321",
              "description": "CWE-1321: Improperly Controlled Modification of Object Prototype Attributes (\u0027Prototype Pollution\u0027)",
              "lang": "en",
              "type": "CWE"
            }
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-31T20:12:15.932Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "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"
        }
      ],
      "source": {
        "advisory": "GHSA-g3hc-697w-wm82",
        "discovery": "UNKNOWN"
      },
      "title": "Livewire DOM-based cross-site scripting during client-side state handling"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-81887",
    "datePublished": "2026-08-31T20:12:15.932Z",
    "dateReserved": "2026-08-27T17:48:42.123Z",
    "dateUpdated": "2026-08-31T20:12:15.932Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-81887",
      "date": "2026-09-01",
      "epss": "0.005",
      "percentile": "0.40809"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-81887\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-08-31T21:17:52.157\",\"lastModified\":\"2026-08-31T21:17:52.157\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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\u0027s 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.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"livewire\",\"product\":\"livewire\",\"versions\":[{\"version\":\"\u003e= 3.0.0-beta.1, \u003c 3.8.3\",\"status\":\"affected\"},{\"version\":\"\u003e= 4.0.0-beta.1, \u003c 4.3.4\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X\",\"baseScore\":5.1,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"NONE\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"ACTIVE\",\"vulnConfidentialityImpact\":\"NONE\",\"vulnIntegrityImpact\":\"NONE\",\"vulnAvailabilityImpact\":\"NONE\",\"subConfidentialityImpact\":\"LOW\",\"subIntegrityImpact\":\"LOW\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-79\"},{\"lang\":\"en\",\"value\":\"CWE-1321\"}]}],\"references\":[{\"url\":\"https://github.com/livewire/livewire/commit/11ebe646f7e81dde2d714815da8b3019d058561e\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/livewire/livewire/pull/10467\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/livewire/livewire/releases/tag/v3.8.3\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/livewire/livewire/releases/tag/v4.3.4\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/livewire/livewire/security/advisories/GHSA-g3hc-697w-wm82\",\"source\":\"security-advisories@github.com\"}]}}"
  }
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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