Bypass of meta content URL escaping causes XSS in html/template_CVE-2026-39823

{
    "lastseen": "",
    "description": "CVE-2026-27142 fixed a vulnerability in which URLs were not correctly escaped inside of a <meta> tag's <content> attribute. If the URL content were to insert ASCII whitespaces around the '=' rune inside of the <content> attribute, the escaper would fail to similarly escape it, leading to XSS.",
    "published": "2026-05-07T19:41:19.524Z",
    "modified": "2026-05-08T14:05:55.152Z",
    "type": "cve",
    "title": "Bypass of meta content URL escaping causes XSS in html/template",
    "source": "Go",
    "references": "https://go.dev/issue/78913\nhttps://go.dev/cl/769920\nhttps://groups.google.com/g/golang-announce/c/qcCIEXso47M\nhttps://pkg.go.dev/vuln/GO-2026-4982",
    "id": "CVE-2026-39823",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Go standard library html/template 0\nGo standard library html/template 1.26.0-0",
    "sourceHref": "",
    "cvss": {
        "score": 6.1,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
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            "privilegesRequired": "",
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            "confidentialityImpact": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "html/template",
    "version": "0",
    "vendor": "Go standard library",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}