{"id":"CVE-2026-41886","summary":"locize Client SDK: Cross-origin DOM XSS & Handler Hijack Through Missing e.origin Validation in InContext Editor","details":"locize is a localization platform that connects code and i18n setup. Prior to version 4.0.21, the locize client SDK registers a window.addEventListener(\"message\", …) handler that dispatches to registered internal handlers (editKey, commitKey, commitKeys, isLocizeEnabled, requestInitialize, …) without validating event.origin. The pre-patch listener in src/api/postMessage.js gates dispatch on event.data.sender === \"i18next-editor-frame\" — that value sits inside the attacker-controlled message payload, not the browser-enforced origin. Any web page that could embed or be embedded by a locize-enabled host — an iframe on a third-party page, a window.open-ed victim, a parent frame reaching down — could send a crafted postMessage and trigger the internal handlers. This issue has been patched in version 4.0.21.","aliases":["GHSA-w937-fg2h-xhq2"],"modified":"2026-07-15T01:48:54.057155124Z","published":"2026-05-08T15:45:23.262Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-346","CWE-79"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41886.json"},"references":[{"type":"WEB","url":"https://github.com/locize/locize/releases/tag/v4.0.21"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41886.json"},{"type":"ADVISORY","url":"https://github.com/locize/locize/security/advisories/GHSA-w937-fg2h-xhq2"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41886"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/locize/locize","events":[{"introduced":"0"},{"fixed":"6923836107d0736020eb20155784f12521875e6f"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"4.0.21"}]}}],"versions":["v4.0.20","v4.0.19","v4.0.18","v4.0.17","v4.0.16","v4.0.15","v4.0.14","v4.0.13","v4.0.12","v4.0.11","v4.0.10","v4.0.9","v4.0.8","v4.0.7","v4.0.6","v4.0.5","v4.0.4","v3.3.0","v3.2.2","v3.2.1","v3.2.0","v3.1.1","v3.1.0","v3.0.4","v3.0.2","v3.0.1","v3.0.0","v2.4.6","v2.4.5","v2.4.4","v2.4.3","v2.4.2","v2.4.1","v2.4.0","v2.3.1","v2.3.0","v2.2.5","v2.2.4","v2.2.3","v2.2.2","v2.2.0","v2.1.0","v2.0.0","v1.2.0","v1.1.0","v1.0.0","v0.4.0","v0.3.0","v0.2.1","v0.2.0","v0.1.0","v0.0.4","v0.0.2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-41886.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:L"}]}