{
    "id": "CVE-2009-4142",
    "published": "2009-12-21 16:30:00",
    "last_modified": "2026-06-16 23:13:07",
    "cvss_score": "4.3",
    "cvss_severity": "MEDIUM",
    "cvss_version": "2.0",
    "cvss_vector": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
    "cwe": "CWE-79",
    "description": "The htmlspecialchars function in PHP before 5.2.12 does not properly handle (1) overlong UTF-8 sequences, (2) invalid Shift_JIS sequences, and (3) invalid EUC-JP sequences, which allows remote attackers to conduct cross-site scripting (XSS) attacks by placing a crafted byte sequence before a special character.",
    "epss_score": "0.06497",
    "epss_percentile": "0.93549",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 1,
    "updated_at": "2026-09-30 18:17:08",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "A public exploit exists."
    },
    "products": [
        {
            "vendor": "php",
            "product": "php"
        }
    ],
    "kev_detail": null,
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "33414",
            "title": "PHP 5.2.11 - 'htmlspecialCharacters()' Malformed Multibyte Character Cross-Site Scripting (1)",
            "date": "2009-12-17",
            "url": "https://www.exploit-db.com/exploits/33414"
        },
        {
            "source": "exploit-db",
            "ref_id": "33415",
            "title": "PHP 5.2.11 - 'htmlspecialCharacters()' Malformed Multibyte Character Cross-Site Scripting (2)",
            "date": "2009-12-17",
            "url": "https://www.exploit-db.com/exploits/33415"
        }
    ],
    "refs_list": [
        "http://bugs.php.net/bug.php?id=49785",
        "http://lists.apple.com/archives/security-announce/2010//Mar/msg00001.html",
        "http://marc.info/?l=bugtraq&m=127680701405735&w=2",
        "http://secunia.com/advisories/37821",
        "http://secunia.com/advisories/38648",
        "http://secunia.com/advisories/40262",
        "http://securitytracker.com/id?1023372",
        "http://support.apple.com/kb/HT4077",
        "http://www.debian.org/security/2010/dsa-2001",
        "http://www.php.net/ChangeLog-5.php",
        "http://www.php.net/releases/5_2_12.php",
        "http://www.securityfocus.com/bid/37389",
        "http://www.vupen.com/english/advisories/2009/3593",
        "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10005",
        "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7085",
        "http://bugs.php.net/bug.php?id=49785",
        "http://lists.apple.com/archives/security-announce/2010//Mar/msg00001.html",
        "http://marc.info/?l=bugtraq&m=127680701405735&w=2",
        "http://secunia.com/advisories/37821",
        "http://secunia.com/advisories/38648",
        "http://secunia.com/advisories/40262",
        "http://securitytracker.com/id?1023372",
        "http://support.apple.com/kb/HT4077",
        "http://www.debian.org/security/2010/dsa-2001",
        "http://www.php.net/ChangeLog-5.php"
    ]
}