π‘οΈ Sentinel: [security improvement] Trusted Types CSP μ μ© (μμ ν DOM API νμ©)#44
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Pull request overview
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Adds Trusted Types enforcement to the appβs CSP to proactively prevent future DOM-based XSS from unsafe DOM sinks, and records the security change in Sentinel documentation.
Changes:
- Enforced Trusted Types via CSP directive
require-trusted-types-for 'script'inindex.html - Added a Sentinel log entry documenting the Trusted Types security posture
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.
| File | Description |
|---|---|
| index.html | Adds Trusted Types enforcement to CSP to block unsafe DOM sink string assignments |
| .jules/sentinel.md | Documents the new Trusted Types CSP enforcement and rationale |
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| <meta charset="utf-8"> | ||
| <meta name="viewport" content="width=device-width, initial-scale=1"> | ||
| <meta http-equiv="Content-Security-Policy" content="default-src 'self'; img-src 'self'; object-src 'none'; base-uri 'self'; form-action 'none'; upgrade-insecure-requests;"> | ||
| <meta http-equiv="Content-Security-Policy" content="default-src 'self'; img-src 'self'; object-src 'none'; base-uri 'self'; form-action 'none'; upgrade-insecure-requests; require-trusted-types-for 'script';"> |
| ## 2026-07-02 - [Zero-Dependency Trusted Types Enforcement] | ||
| **Vulnerability:** [Missing protection against potential future DOM-based XSS if risky sinks are introduced] | ||
| **Learning:** [Because the application uses safe DOM properties like `textContent` instead of `innerHTML`, we can natively enforce Trusted Types via CSP without needing a default policy or an external sanitizer like DOMPurify.] | ||
| **Prevention:** [Enforce `require-trusted-types-for 'script'` in CSP for applications that exclusively use safe DOM APIs to proactively block future insecure sink usage.] |
Severity: MEDIUM
Vulnerability: λ―Έλμ μ μ¬μ μΌλ‘ λμ λ μ μλ DOM κΈ°λ° XSS μ·¨μ½μ (μμ νμ§ μμ sink μ¬μ© λ°©μ§ λλ½)
Impact: κ°λ°μκ° μ€μλ‘
innerHTMLλ± μνν DOM APIλ₯Ό μ¬μ©νκ² λλ©΄ XSS 곡격μ λ ΈμΆλ μ μμ΅λλ€.Fix: μ ν리μΌμ΄μ μ νμ¬ μ½λκ° μ΄λ―Έ μμ ν
textContentλ§ μ¬μ©νκ³ μμΌλ―λ‘, μΈλΆ μμ‘΄μ±(DOMPurify λ±)μ΄λ 볡μ‘ν Default Policy μμ΄index.htmlμ CSPμrequire-trusted-types-for 'script'μ§μμ΄λ§ μΆκ°νμ¬ DOM Sinkμ λ¬Έμμ΄ ν λΉμ μμ² μ°¨λ¨νμ΅λλ€.Verification: μλ²λ₯Ό μ€ννμ¬ λ‘컬 λΈλΌμ°μ λ λλ§ μ CSP μλ¬κ° λ°μνμ§ μλ κ²μ Playwrightλ₯Ό ν΅ν΄ ν μ€νΈ λ° κ²μ¦ μλ£νμμ΅λλ€.
PR created automatically by Jules for task 18174191253105120659 started by @seonghobae