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.

Remediation

References

CVE-2009-4142

Related Vulnerabilities

Moodle Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') Vulnerability (CVE-2012-3393)

WordPress Plugin BuddyPress Activity Plus Multiple Vulnerabilities (1.6.1)

Moodle Permissions, Privileges, and Access Controls Vulnerability (CVE-2014-7834)

IBM RTC Exposure of Sensitive Information to an Unauthorized Actor Vulnerability (CVE-2017-1524)

Sqlite Improper Input Validation Vulnerability (CVE-2017-13685)

Severity

Medium

Classification

CVE-2009-4142 CWE-707

Tags

Missing Update Known Vulnerabilities