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#authentication

User authentication mechanisms

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Rate Limiting Fails in Production Because It Counts the Wrong Dimension

Rate Limiting Fails in Production Because It Counts the Wrong Dimension

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6 min read
Working: Device Flow Phishing -- The OAuth Attack That Uses the Real Login Page

Working: Device Flow Phishing -- The OAuth Attack That Uses the Real Login Page

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5 min read
JWT Key Reference Injection: The Attack Class That Wins Bounties While Guides Miss It

JWT Key Reference Injection: The Attack Class That Wins Bounties While Guides Miss It

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5 min read
Type Juggling in API Authentication: How Sending `true` Bypasses a Password Check

Type Juggling in API Authentication: How Sending `true` Bypasses a Password Check

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5 min read
JWT Vulnerabilities Are API Design Bugs: Three Implementation Decisions That Betray Cryptographic Intent

JWT Vulnerabilities Are API Design Bugs: Three Implementation Decisions That Betray Cryptographic Intent

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5 min read
The OAuth Implicit Flow Is Deprecated, But Your Access Tokens Are Still Leaking

The OAuth Implicit Flow Is Deprecated, But Your Access Tokens Are Still Leaking

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4 min read
Three Signal Channels Leak Valid Account Lists Before Authentication Completes: Status Code, Response Body, and Timing

Three Signal Channels Leak Valid Account Lists Before Authentication Completes: Status Code, Response Body, and Timing

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5 min read
OAuth 2.0 redirect_uri Bypass: The 5-Condition Matrix That Determines Exploitability

OAuth 2.0 redirect_uri Bypass: The 5-Condition Matrix That Determines Exploitability

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6 min read
Authentication for AI Agents: Lessons We Can Borrow from Enterprise Identity

Authentication for AI Agents: Lessons We Can Borrow from Enterprise Identity

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3 min read
Self-Hosted SSO from Scratch with Laravel Passport

Self-Hosted SSO from Scratch with Laravel Passport

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33 min read
Safer Email Change Flows Start With Proof

Safer Email Change Flows Start With Proof

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4 min read
Building a Custom MFA and Secure Session Handoff Platform for Shared In-Store Devices

Building a Custom MFA and Secure Session Handoff Platform for Shared In-Store Devices

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8 min read
The French Tax Leak Started With a Password

The French Tax Leak Started With a Password

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9 min read
JWT Auth Without the Confusion

JWT Auth Without the Confusion

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2 min read
How to Inspect a JWT Without Uploading a Production Token

How to Inspect a JWT Without Uploading a Production Token

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4 min read
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