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Security: update SECURITY.md + add blob: to CSP #19

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Merged
suradet-ps merged 1 commit into from
Aug 5, 2026
Merged

Security: update SECURITY.md + add blob: to CSP #19

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13 changes: 9 additions & 4 deletions SECURITY.md
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Original file line number Diff line number Diff line change
Expand Up @@ -59,23 +59,28 @@ The `vercel.json` deploys security headers on every response:

| Header | Value | Purpose |
|--------|-------|---------|
| `Content-Security-Policy` | See below | Deny-by-default, self-origin only |
| `X-Content-Type-Options` | `nosniff` | Prevents MIME-type sniffing |
| `X-Frame-Options` | `DENY` | Prevents framing (clickjacking) |
| `Referrer-Policy` | `strict-origin-when-cross-origin` | Limits referrer leakage |
| `Permissions-Policy` | `camera=(), microphone=(), geolocation=()` | Disables unused APIs |

A `Content-Security-Policy` header should be added with:
CSP directives enforced:

```
default-src 'none';
script-src 'self';
style-src 'self' 'unsafe-inline';
connect-src 'self';
font-src 'self';
img-src 'self' blob:;
font-src 'self';
connect-src 'self';
worker-src 'self';
manifest-src 'self';
```

No `unsafe-eval`. The `unsafe-inline` for styles is required by Leptos's
CSR rendering.
CSR rendering. CI enforces that the CSP header is present and valid via the
`csp-verify` job in `.github/workflows/ci.yml`.

---

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2 changes: 1 addition & 1 deletion vercel.json
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Expand Up @@ -9,7 +9,7 @@
{
"source": "/(.*)",
"headers": [
{ "key": "Content-Security-Policy", "value": "default-src 'none'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self'; font-src 'self'; connect-src 'self'; worker-src 'self'; manifest-src 'self'" },
{ "key": "Content-Security-Policy", "value": "default-src 'none'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' blob:; font-src 'self'; connect-src 'self'; worker-src 'self'; manifest-src 'self'" },
{ "key": "X-Content-Type-Options", "value": "nosniff" },
{ "key": "X-Frame-Options", "value": "DENY" },
{ "key": "Referrer-Policy", "value": "strict-origin-when-cross-origin" },
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