Topic: vulnerability-disclosure
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security.txt: a machine-readable vulnerability reporting channel
RFC 9116 defines /.well-known/security.txt, a plain-text file served over HTTPS with required Contact and Expires fields and optional Encryption, Policy, Canonical, Acknowledgments and Preferred-Languages fields; it gives researchers and tools a deterministic place to find the right inbox, and it only helps if someone reads that inbox.
Machine-readable: JSON