The OWASP Top 10 of 2021 has reclassified XXE (XML External Entities) vulnerabilities, now placing them under the category of Security Misconfigurations at rank #5. XXE allows attackers to exploit XML parsers by abusing external entities, potentially leading to significant security breaches such as reading local files, initiating network requests, or executing denial-of-service attacks. Although not the most prevalent, the severity of XXE vulnerabilities remains high due to its exploitability, which requires minimal skills beyond uploading XML documents for parsing. XML's widespread use in various data forms, like metadata in images and PDFs, underscores the risk, as applications often unknowingly parse XML. Notably, XXE was successfully exploited on a Google server via Google Toolbars, highlighting its real-world impact. To mitigate risks, security measures include disabling External Entities in XML parsers, switching to simpler data formats like JSON when possible, and ensuring XML parsers are patched and up to date. Detectify and other security tools can help identify XXE vulnerabilities by scanning web applications.