Framework: The Center for Internet Security (CIS) Top 18 Controls

This safeguard directs organizations to formalize a secure application development process and set explicit standards for how code is designed, written, reviewed, and released. Secure coding practices begin with consistent patterns that remove entire classes of defects: input validation at all trust boundaries; strict output encoding; centralized, parameterized data access; safe file handling; and default-deny authorization checks enforced server-side. Developers should never implement their own crypto—use vetted libraries and platform services for encryption, key storage, and hashing. Secrets must be externalized and rotated, not hard-coded in repositories or configuration files. Code reviews include security checklists that look for dangerous functions, insecure deserialization, insufficient logging, and error handling that leaks internals. Standards extend to infrastructure code as well, ensuring that IaC templates set secure defaults for networks, identities, and storage with least-privilege policies and explicit deny rules.

To make these practices stick, automation must back them up. Pre-commit hooks and CI gates can run linters and Static Application Security Testing (SAST) to catch injection risks, unsafe APIs, or missing input normalization before code merges. Software Composition Analysis (SCA) inventories third-party components, flags known vulnerabilities, and enforces version policies or allowlists. Build systems sign artifacts and verify provenance to guard against tampering in transit, while pipelines inject secrets at build or deploy time via managed vaults. Severity thresholds guide triage so that high-impact flaws block release until remediated or risk-accepted formally with time-boxed exceptions. Security champions embedded in each team tailor guidance to language and framework specifics, convert incident lessons into new guardrails, and coach peers through refactors that reduce attack surface. Over time, these mechanisms transform secure coding from ad-hoc heroics into a repeatable, auditable craft that measurably lowers defect density and vulnerability recurrence across releases.
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