🛡️ Sentinel: [보안 개선] Trusted Types CSP 적용

[seonghobae]

🚨 Severity: MEDIUM
💡 Vulnerability: 애플리케이션에 Trusted Types가 강제되지 않아, 향후 innerHTML과 같은 안전하지 않은 DOM sink가 코드에 도입될 경우 잠재적인 DOM 기반 XSS 공격에 노출될 위험이 존재했습니다.
🎯 Impact: 서드파티 스크립트가 오염되거나 개발자의 실수로 인해 유효성 검증을 거치지 않은 사용자 입력이 실행 가능한 스크립트로 렌더링되어 세션 탈취 등의 피해가 발생할 수 있습니다.
🔧 Fix: index.html의 CSP(Content Security Policy) 태그에 require-trusted-types-for 'script' 지시어를 추가했습니다. 이 애플리케이션은 이미 textContent와 같은 안전한 DOM API만을 사용하고 있으므로 별도의 Trusted Types 정책이나 외부 새니타이저(DOMPurify 등) 없이도 안전하게 적용됩니다.
✅ Verification: Playwright 자동화 테스트 스크립트를 통해 CSP 적용 후 언어 변경 등 기존 로직이 콘솔 에러(SecurityError 등) 없이 정상 동작함을 검증 완료했습니다.

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PR created automatically by Jules for task 2175858504356577280 started by @seonghobae

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[opencode-agent]

OpenCode Review Overview

• Head SHA: 73c6df236cefe5cf08b622960924cfe2411235f8
• Workflow run: 28915401865
• Workflow attempt: 1
• Gate result: APPROVE (exit 0)

Changed-File Evidence Map

flowchart LR
  PR["PR changed files"] --> Evidence["OpenCode bounded evidence"]
  Evidence --> S1["Changed file (3 files)"]
  S1 --> I1["repository behavior"]
  I1 --> R1["Review risk: Changed file (3 files)"]
  R1 --> V1["required checks"]

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