CVE-2024-27516: 
PHP vulnerability analysis and mitigation

Server-Side Template Injection (SSTI) vulnerability was discovered in LiveHelperChat versions before 4.34v. The vulnerability allows remote attackers to execute arbitrary code and obtain sensitive information through the search parameter in lhc_web/modules/lhfaq/faqweight.php (NVD, CVE).

The vulnerability exists due to improper filtering of template injection characters ('{{' and '}}') in the search parameter within the faqweight.php file. While the application implements strip_tags function to remove HTML and PHP tags, it fails to properly sanitize template injection patterns. The vulnerability has been assigned a CVSS v3.1 base score of 9.8 (CRITICAL) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, indicating high severity across confidentiality, integrity, and availability impacts (NVD).

Successful exploitation of this vulnerability could allow remote attackers to execute arbitrary code on the affected system and obtain sensitive information. The critical CVSS score indicates potential for complete system compromise (NVD).

The vulnerability has been patched in LiveHelperChat version 4.34v. Users are strongly recommended to upgrade to this version or later to address the security issue. The fix involves proper filtering of template injection characters in the search parameter (Github Commit).