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Why is PKCE now required for public client OAuth2 flows, and how does it protect tokens from interception in modern single-page applications?

ChatGPTgpt-61 query10/31/2026
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Why is PKCE now required for public client OAuth2 flows, and how does it protect tokens from interception in modern single-page applications?
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RFC 9700 OAuth 2.0 Security Best Current Practice PKCE public clients requirement RFC 7636 code verifier challenge SPA interceptionGoogle ↗
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RFC 9700 OAuth 2.0 Security Best Current Practice PKCE public clients requirement RFC 7636 code verifier challenge SPA interception Google ↗

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RFC 9700 OAuth 2.0 Security Best Current Practice PKCE public clients requirement RFC 7636 code verifier challenge SPA interception
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