{"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":"2026-09-05T03:30:33.173809727Z","published":"2026-08-31T20:12:15.932Z","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"}]},"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":"0"},{"fixed":"11ebe646f7e81dde2d714815da8b3019d058561e"}],"database_specific":{"source":"REFERENCES"}}],"versions":["v3.7.13","v3.7.12","v3.7.11","v3.7.10","v3.7.9","v3.7.8","v3.7.7","v3.7.6","v3.7.5","v3.7.4","v3.7.3","v3.7.2","v3.7.1","v3.7.0","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","v2.12.3","v3.0.0-beta.4","v3.0.0-beta.1","v3.0.0-beta.3","v3.0.0-beta.2","v2.12.2","v2.12.1","v2.12.0","v2.11.3","v2.11.2","v2.11.1","v2.11.0","v2.10.8","v2.10.7","v2.10.6","v2.10.5","v2.10.4","v2.10.3","v2.10.2","v2.10.1","v2.10.0","v2.9.0","v2.8.2","v2.8.1","v2.8.0","v2.7.2","v2.7.1","v2.7.0","v2.6.7","v2.6.6","v2.6.5","v2.6.4","v2.6.3","v2.6.2","v2.6.1","v2.6.0","v2.5.5","v2.5.4","v2.5.3","v2.5.2","2.5.0","v2.4.4","v2.4.3","v2.4.0","v2.3.18","v2.3.17","v2.3.16","v2.3.15","v2.3.14","v2.3.13","v2.3.12","v2.3.11","v2.3.10","v2.3.9","v2.3.8","v2.3.7","v2.3.6","v2.3.5","v2.3.4","v2.3.3","v2.3.2","v2.3.0","v2.2.9","v2.2.8","v2.2.7","v2.2.6","v2.2.5","v2.2.4","v2.2.3","v2.2.2","v2.2.1","v2.2.0","v2.1.4","v2.1.3","v2.1.2","v2.1.1","v2.1.0","v2.0.4","v2.0.3","v2.0.2","v2.0.1","v2.0.0","1.3.0","v1.2.0","v1.1.0","v1.0.13","v1.0.14","v1.0.10","v1.0.9","v1.0.8","v1.0.7","v1.0.6","v1.0.5","v1.0.4","v1.0.3","v1.0.2","v1.0.1","v1.0.0","v0.7.4","v0.7.3","v0.7.2","v0.7.1","v0.7.0","v0.6.0","v0.5.3","v0.5.2","v0.5.1","v0.5.0","v0.4.0","v0.3.21","v0.3.20","v0.3.19","v0.3.18","v0.3.17","v0.3.16","v0.3.15","v0.3.14","v0.3.13","v0.3.12","v.0.3.11","v0.3.10","v0.3.9","v0.3.7","v0.3.6","v0.3.5","v0.3.0","v0.3.4","v0.3.2","v0.3.1","v0.2.10","v0.2.9","v0.2.8","v0.2.7","v0.2.6","v0.2.5","v0.2.4","v0.2.3","v0.2.2","v0.2.1","v0.2.0","v0.1.6","v0.1.5","v0.1.4","v0.1.3","v0.1.2","v0.1.1","v0.1","v0.0.15","v0.0.14","v0.0.13","v0.0.11","v0.0.10","v0.0.9","v0.0.8","v0.0.7","v0.0.6","v0.0.5","v0.0.4","v0.0.3","v0.0.2","v0.0.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-81887.json"}}],"schema_version":"1.9.0","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"}]}