Broken access control remediation addresses the most prevalent web application security risk according to the OWASP Top 10 (2021). Access control enforces policy so users cannot act outside their intended permissions. When these controls fail -- through missing authorization checks, insecure direct object references, path traversal, or privilege escalation flaws -- attackers access unauthorized functionality and data. Remediation involves systematically identifying and fixing these failures across application architectures.
Access control remediation follows a structured approach. First, organizations map all application endpoints, resources, and actions to required permission levels, creating an authorization matrix. Code review identifies endpoints missing authorization checks -- a common finding where developers protect the UI but not the underlying API. Insecure Direct Object Reference (IDOR) remediation replaces predictable identifiers with indirect references or implements server-side ownership verification for every resource access. Vertical privilege escalation fixes ensure that role checks occur server-side on every request, not just at session establishment. Horizontal privilege escalation remediation verifies that users can only access their own resources. Path traversal prevention canonicalizes file paths and validates they fall within permitted directories. Centralized authorization frameworks replace scattered inline checks, providing consistent enforcement.
Broken access control enables attackers to view other users' data, modify records they should not access, escalate privileges to administrative levels, and perform actions outside their authorized scope. These vulnerabilities frequently lead to data breaches, compliance violations, and complete application compromise.
CDA addresses broken access control within VSD and IAT domains. Theater missions implement centralized authorization frameworks, conduct IDOR testing campaigns, and build automated access control verification into deployment pipelines, ensuring authorization coverage grows systematically rather than relying on individual developer diligence.