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Pull request overview
This PR tightens the Express CORS configuration to address a low-severity finding where /api/files/* responses included Access-Control-Allow-Origin: *, allowing any website to read cross-origin responses.
Changes:
- Replaced the permissive
cors()middleware with an origin allowlist function. - Added an allowlist regex permitting
https://*.cancer.govand localhost origins for development. - Explicitly allows requests without an
Originheader (server-to-server).
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AustinSMueller
approved these changes
May 5, 2026
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ICDC-4155