JWT "nbf" (Not Before) Claim Error Causing Validation Failures Across Timezones
An nbf (Not Before) validation failure is virtually never actually a timezone problem, even though it often gets diagnosed that way — JWT timestamp claims are...
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OAuth 2.0 PKCE Code Verifier Mismatch on Mobile App Authentication Flow
A PKCE code verifier mismatch means the verifier sent during the token exchange doesn't match the code challenge originally sent during authorization — since...
Rate Limiting Per IP Failing Behind Cloudflare/Reverse Proxy (Incorrect Client IP)
Application-level rate limiting that seems to treat every visitor as the same client, or that's trivially bypassable, almost always means your framework is...
SSH Host Key Verification Failed Error Fix After Server IP Change
SSH's host key warning after a server's IP address changes, or after a genuine reinstall, is the client correctly detecting that the server's identity...
API Key Header Leaked in Browser Network Tab, How to Route via Proxy Backend
An API key visible in the browser's Network tab is exposed to anyone with access to developer tools — which is effectively any user of your site — regardless...
CORS Preflight Response Invalid HTTP Status Code 405 on OPTIONS Verb
A 405 Method Not Allowed specifically on the automatic OPTIONS preflight request means your server (or a framework/router within it) has no route configured to...
JWT "Invalid Signature" Error When Validating Token Across Microservices
A JWT that validates fine within the service that issued it, but fails with "invalid signature" when validated by a different microservice, means the two...
Rate Limiting Bypass via X-Forwarded-For Header Spoofing, How to Block It
If your rate limiter keys off the X-Forwarded-For header without validating where that header actually came from, an attacker can trivially bypass rate...
MySQL Foreign Key Constraint Fails When Adding Index to Existing Column
A foreign key constraint failing specifically while adding an index or altering an existing column usually means either the column's data type doesn't exactly...