Calling window.close() from server-side content causes crash in the Mattermost Desktop App_CVE-2026-4643

{
    "lastseen": "",
    "description": "Mattermost Desktop App versions <=6.1 6.0.1 5.4.13.0 fail to prevent server-rendered content from closing an underlying application view in the Mattermost Desktop App which allows a malicious server or plugin to crash the desktop client via invoking {{window.close()}} in the renderer context, leading to a denial of service condition at the client level. Mattermost Advisory ID: MMSA-2026-00633",
    "published": "2026-05-18T08:43:34.588Z",
    "modified": "2026-05-18T08:43:34.588Z",
    "type": "cve",
    "title": "Calling window.close() from server-side content causes crash in the Mattermost Desktop App",
    "source": "Mattermost",
    "references": "https://mattermost.com/security-updates",
    "id": "CVE-2026-4643",
    "bulletinFamily": "",
    "cwe": [
        "CWE-754"
    ],
    "cvelist": null,
    "sourceData": "Mattermost Mattermost 0\nMattermost Mattermost 0",
    "sourceHref": "",
    "cvss": {
        "score": 3.5,
        "severity": "LOW",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/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": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Mattermost",
    "version": "0",
    "vendor": "Mattermost",
    "ai_description": "",
    "ai_severity": "",
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    "ai_product": "",
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    "ai_score": 0
}