Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
ProcessWire was discovered to contain multiple Cross-site Scripting (XSS) vulnerabilities via the "Search Users" and "Search Pages" function. These vulnerabilities allow attackers to execute arbitrary web scripts or HTML via injection of a crafted payload. This vulnerability affects processwire/processwire versions prior to 3.0.210.
CWE-79 - Cross Site Scripting
Cross-Site Scripting, commonly referred to as XSS, is the most dominant class of vulnerabilities. It allows an attacker to inject malicious code into a pregnable web application and victimize its users. The exploitation of such a weakness can cause severe issues such as account takeover, and sensitive data exfiltration. Because of the prevalence of XSS vulnerabilities and their high rate of exploitation, it has remained in the OWASP top 10 vulnerabilities for years.