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    CVE-2009-4142

    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.

    Published:Oct 6, 2009
    Last Modified:Apr 23, 2026
    EPS:Dec 21, 2009
    EPSS Score:0.16946
    CVSS Score:4.3

    Affected Products

    Vendor
    Php
    Product
    Php
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    http://securitytracker.com/id?1023372http://www.securityfocus.com/bid/37389http://securitytracker.com/id?1023372http://www.securityfocus.com/bid/37389https://www.exploit-db.com/exploits/33414https://www.exploit-db.com/exploits/33415

    Related CVEs

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    CVE-2026-7263 (CVSS 6.3) — In PHP versions 8.4.* before 8.4.21 and 8.5.* before 8.5.6, DOMNode::C14N() method may process the XML data in…
    CVE-2026-6104 (CVSS 6.3) — In PHP versions 8.4.* before 8.4.21 and 8.5.* before 8.5.6, when an encoding name containing an embedded NUL b…
    CVE-2026-7258 (CVSS 6.3) — In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, some fu…
    CVE-2026-6722 (CVSS 9.5) — In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, the SOA…
    CVE-2026-7259 (CVSS 2.1) — In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, a misma…
    CVE-2026-7261 (CVSS 6.3) — In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, when So…
    CVE-2026-7262 (CVSS 2.9) — In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, when a …
    CVE-2025-14179 (CVSS 7.4) — In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, the PDO…
    CVE-2026-7568 (CVSS 6.3) — In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, the met…

    References

    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
    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

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High