This vulnerability in SourceCodester Online Book Store System 1.0 affects the System Settings Module's /admin/index.php?page=site_settings component. It allows remote attackers to perform cross-site scripting (XSS) attacks by injecting malicious scripts through manipulated input. The vulnerability is exploitable remotely and the exploit has been made public. No official patch or remediation level has been provided by the vendor as of the publication date.

Successful exploitation of this vulnerability could allow an attacker to execute arbitrary scripts in the context of the affected web application, potentially leading to session hijacking, defacement, or redirection to malicious sites. However, the impact is rated medium with no known exploits in the wild at this time.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or remediation level is provided, users should monitor the vendor's communications for updates. Until a patch is available, consider restricting access to the affected admin page and applying web application firewall (WAF) rules to detect and block XSS attempts targeting this endpoint.