{"id":"CVE-2026-81887","summary":"Livewire DOM-based cross-site scripting during client-side state handling","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.","aliases":["GHSA-g3hc-697w-wm82"],"modified":"2026-11-04T02:47:56.212730092Z","published":"2026-08-31T20:12:15.932Z","database_specific":{"cwe_ids":["CWE-1321","CWE-79"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81887.json","cna_assigner":"GitHub_M"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/livewire/livewire","events":[{"introduced":"ea97977ac080fff70f0a35280bdb7322c246345e"},{"fixed":"ab9c2ac9305008aa9ab0f1beecec8ed6c3a591b2"},{"introduced":"28efe84a67ce8e0cf4d5afeeed577baebd03e745"},{"fixed":"e6c8d631e9687fbdd5c2bb7be9d7a5d699cce0e2"},{"fixed":"11ebe646f7e81dde2d714815da8b3019d058561e"}],"database_specific":{"extracted_events":[{"range":[{"introduced":"3.0.0-beta.1"},{"fixed":"3.8.3"}],"source":"AFFECTED_FIELD","strategy":"StringRangeExpression"},{"range":[{"introduced":"4.0.0-beta.1"},{"fixed":"4.3.4"}],"source":"AFFECTED_FIELD","strategy":"StringRangeExpression"},{"range":[{"fixed":"11ebe646f7e81dde2d714815da8b3019d058561e"}],"source":"REFERENCES_COMMIT"},{"original_tag":"v3.8.3","range":[{"fixed":"ab9c2ac9305008aa9ab0f1beecec8ed6c3a591b2"}],"source":"REFERENCES_TAG"},{"range":[{"fixed":"e6c8d631e9687fbdd5c2bb7be9d7a5d699cce0e2"}],"source":"REFERENCES_TAG","original_tag":"v4.3.4"}]}}],"versions":["v3.7.13","v4.2.3","v3.7.12","v4.2.2","v3.7.11","v4.2.1","v4.2.0","v3.7.10","v4.1.4","v3.7.9","v4.1.3","v3.7.8","v4.1.2","v3.7.7","v4.1.1","v3.7.6","v4.1.0","v4.0.3","v4.0.2","v3.7.5","v3.7.4","v4.0.1","v4.0.0","v4.0.0-beta.6","v3.7.3","v3.7.2","v4.0.0-beta.5","v3.7.1","v4.0.0-beta.4","v3.7.0","v4.0.0-beta.3","v4.0.0-beta.2","v4.0.0-beta.1","v3.7.0-beta.2","v3.7.0-beta.1","v3.6.4","v3.6.3","v3.6.2","v3.6.1","v3.6.0","v3.5.20","v3.5.19","v3.5.18","v3.5.17","v3.5.16","v3.5.15","v3.5.14","3.5.14","v3.5.13","v3.5.12","v3.5.11","v3.5.2","v3.5.4","v3.5.3","v3.5.1","v3.5.0","v3.4.12","v3.4.11","v3.4.10","v3.4.9","v3.4.8","v3.4.7","v3.4.6","v3.4.5","v3.4.4","v3.4.3","v3.4.2","v3.4.1","v3.4.0","v3.3.5","v3.3.4","v3.3.3","v3.3.2","v3.3.1","v3.3.0","v3.2.6","v3.2.5","v3.2.4","v3.2.3","v3.2.2","v3.2.1","v3.2.0","v3.1.0","v3.0.10","v3.0.9","v3.0.8","v3.0.7","v3.0.6","v3.0.5","v3.0.4","v3.0.3","v3.0.2","v3.0.1","v3.0.0","v3.0.0-beta.8","v3.0.0-beta.5","v3.0.0-beta.4","v3.0.0-beta.1","v3.0.0-beta.3","v3.0.0-beta.2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-81887.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","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"}]}