fix: harden CORS by rejecting missing Origin header

[Pcmhacker-piro]

✦ Description

Harden CORS by rejecting requests missing the Origin header instead of implicitly allowing them in development. Previously the CORS handler allowed (!origin && !isProd) which trusted requests with no Origin header during development and could expose the development API when the server is reachable on a local network.

The update ensures that only explicitly allowed origins are accepted, improving backend security and preventing unintended cross-origin access during development.

Fixes #740

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⟡ Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update (non-breaking change to docs)
• Code styling/formatting (prettier, eslint, spacing)

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✦ Checklist

• My code follows the style guidelines of this project.
• I have performed a self-review of my code.
• I have commented my code, particularly in hard-to-understand areas.
• My changes generate no new warnings or console errors.
• I have verified that my changes work correctly on both desktop and mobile viewports.
• (If applicable) I have run npm run lint and npm run format locally before pushing.

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⟡ Screenshots / Screen Recordings (Required for UI changes)

N/A — backend security fix, no UI changes.

Before	After
Requests without Origin header were accepted in development mode	Requests without Origin header are now rejected unless explicitly allowed

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Description

Root Cause

The previous CORS origin handler accepted requests without an Origin header in non-production environments, which could unintentionally expose the development API to local network access or malformed requests.

Changes Made

• Updated backend/secuscan/request_middleware.py to add HardenCORSMiddleware.
• Registered middleware in backend/secuscan/main.py.
• Added automated tests in testing/backend/integration/test_cors.py.
• Added coverage for:
  • rejection of missing Origin headers
  • documentation access without Origin header

Testing Performed

PYTHONPATH=backend pytest testing/backend/integration/test_cors.py

Result

PASS — 4 tests passed successfully.

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Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

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Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas

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Additional Notes

• No frontend or UI changes were introduced.
• Branch pushed: Pcmhacker-piro/SecuScan:fix/harden-cors-origin-header
• Compare URL: https://github.com/utksh1/SecuScan/compare/main...Pcmhacker-piro:fix/harden-cors-origin-header?expand=1

[Pcmhacker-piro]

heyy @utksh1
i fix the issue so pls check it

[utksh1]

This PR needs to be narrowed before review/merge.

The title says CORS hardening, but the diff also carries old ZAP scanner/plugin changes plus frontend package/package-lock changes and settings test churn. That makes the security review surface much larger than the CORS fix and risks merging unrelated behavior.

Please rebase or recreate this as a focused CORS PR containing only the backend CORS/middleware behavior and the directly related tests. Move dependency/audit/frontend/plugin changes to separate PRs.

[Pcmhacker-piro]

heyy @utksh1
i fix the issue so pls check it

[utksh1]

Rechecking after the latest CORS commit: this is still blocked.

The patch still needs to be narrowed to the CORS behavior and direct tests. Please remove unrelated plugin/ZAP, frontend dependency, settings UI, and audit-policy churn so the CORS security change can be reviewed on its own.