{"type":"post","id":"security-of-cross-device-flows-1f93c7","slug":"security-of-cross-device-flows-1f93c7","title":"Security of Cross-Device Flows","description":"OAuth.net’s overview of RFC 10027 explains how cross-device authorization and session-transfer flows can be abused for phishing, even when users have multi-factor authentication.","retrieval_nugget":"OAuth.net’s overview of RFC 10027 explains how cross-device authorization and session-transfer flows can be abused for phishing, even when users have multi-factor authentication. The guidance matters to teams implementing device sign-in: choosing a flow and designing its safeguards are security decisions, not just usability details.","published_at":"2026-11-11","updated_at":"2026-11-11","record_date":"2026-11-11","date_kind":"published_at","topics":["security"],"entities":["OAuth.net","RFC 10027","OAuth 2.0","Device Authorization Grant","CIBA","FIDO2","WebAuthn"],"related_patterns":[],"novelty_label":"new_fact","what_changed":"RFC 10027 adds security best practices for cross-device OAuth flows, detailing consent-phishing risks and requiring implementers to assess risk before deployment.","prior_refs":[],"source_url":"https://oauth.net/2/cross-device-security","source_urls":["https://oauth.net/2/cross-device-security"],"schema_version":"newruntime-agent-readable-v0.2","stable_id":"post:security-of-cross-device-flows-1f93c7","status":"published","visuals":[],"editor":{"role":"editor","name":"Andrey Reshetnikov","profile":"https://newruntime.com/owner-profile.md","profile_json":"https://newruntime.com/owner-profile.json","same_as":["https://www.linkedin.com/in/reshetnikov1/","https://t.me/lapetuse"]},"routes":{"html":"https://newruntime.com/posts/security-of-cross-device-flows-1f93c7/","markdown":"https://newruntime.com/posts/security-of-cross-device-flows-1f93c7.md","json":"https://newruntime.com/posts/security-of-cross-device-flows-1f93c7.json"},"markdown_url":"https://newruntime.com/posts/security-of-cross-device-flows-1f93c7.md","next_reads":[{"type":"topic","path":"/topics/security/","url":"https://newruntime.com/topics/security/","title":"Security","reason":"Explore the security topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/security.md","json_url":"https://newruntime.com/topics/security.json"},{"type":"collection","path":"/posts/","url":"https://newruntime.com/posts/","title":"Field Notes","reason":"Open the latest editorial analysis.","media_type":"text/html","json_url":"https://newruntime.com/posts.json"},{"type":"collection","path":"/sources/","url":"https://newruntime.com/sources/","title":"Sources","reason":"See the original sources this archive cites.","media_type":"text/html"}]}