access:pre-auth — CVE vulnerabilities tagged 21158

The tag "access:pre-auth" identifies vulnerabilities that allow unauthenticated attackers to gain unauthorized access to a system, application, or network resource before legitimate credentials are verified. This classification is critical because it represents the lowest barrier to entry for exploitation, enabling remote code execution, data exfiltration, or full system compromise without prior authentication. Typical scenarios involve flaws in authentication mechanisms, such as broken access controls, insecure direct object references, or logic errors in session management that bypass login requirements. Attackers frequently target these weaknesses via exposed APIs, administrative interfaces, or default configurations. Because no user interaction or valid credentials are needed, pre-authentication flaws are among the most severe and widely exploited security issues, often leading to immediate breach of confidentiality, integrity, and availability across affected infrastructure.