locize Client SDK: Cross-origin DOM XSS & Handler Hijack Through Missing e.origin Validation in InContext Editor_CVE-2026-41886

{
    "lastseen": "",
    "description": "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\", \u2026) handler that dispatches to registered internal handlers (editKey, commitKey, commitKeys, isLocizeEnabled, requestInitialize, \u2026) without validating event.origin. The pre-patch listener in src/api/postMessage.js gates dispatch on event.data.sender === \"i18next-editor-frame\" \u2014 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 \u2014 an iframe on a third-party page, a window.open-ed victim, a parent frame reaching down \u2014 could send a crafted postMessage and trigger the internal handlers. This issue has been patched in version 4.0.21.",
    "published": "2026-05-08T15:45:23.262Z",
    "modified": "2026-05-08T15:45:23.262Z",
    "type": "cve",
    "title": "locize Client SDK: Cross-origin DOM XSS & Handler Hijack Through Missing e.origin Validation in InContext Editor",
    "source": "GitHub_M",
    "references": "https://github.com/locize/locize/security/advisories/GHSA-w937-fg2h-xhq2\nhttps://github.com/locize/locize/releases/tag/v4.0.21",
    "id": "CVE-2026-41886",
    "bulletinFamily": "",
    "cwe": [
        "CWE-79",
        "CWE-346"
    ],
    "cvelist": null,
    "sourceData": "locize locize < 4.0.21",
    "sourceHref": "",
    "cvss": {
        "score": 7.5,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:L",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
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            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "locize",
    "version": "< 4.0.21",
    "vendor": "locize",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}