Start Debugging

Tag: security

34 posts · Page 3 of 4

2026-06-26 comparison aspnetcore dotnet

JWT vs cookie authentication in ASP.NET Core 11: which should you pick?

Use cookie authentication for any app where the browser is the only client, and reserve JWT bearer tokens for APIs called by mobile apps, other services, or third parties. Here is the full decision matrix.

2026-06-25 claude-code ai-agents security

Claude Code 2.1.187 Stops the Sandbox From Reading Your AWS Keys

The new sandbox.credentials setting in Claude Code v2.1.187 denies reads of credential files and unsets secret env vars before sandboxed Bash commands run. Here is why the default read policy was a hole, and how to close it.

2026-06-25 errors csharp dotnet

Fix: 405 Method Not Allowed instead of 401 with JWT bearer in ASP.NET Core

A protected endpoint returning 405 instead of 401 almost always means routing rejected the HTTP verb before auth ran, or a cookie scheme stole the challenge. Here is how to tell which.

2026-06-25 csharp dotnet dotnet-11

Why your ASP.NET Core JWT returns 401 even with a valid token

A valid token that still 401s almost always means the bearer handler never ran or ran under the wrong scheme. Check middleware order, the default scheme, the scheme name, and whether the header even reached the handler.

2026-06-25 microsoft-agent-framework ai-agents dotnet

How to add policy enforcement and audit logging to a Microsoft Agent Framework agent

Wire the Agent Governance Toolkit into a Microsoft Agent Framework 1.0 agent so every tool call is checked against a YAML policy and written to a tamper-evident audit trail. Full C# middleware, policy file, and a hash-chained audit sink.

2026-06-22 csharp dotnet dotnet-11

How to validate a JWT's issuer, audience, and lifetime in ASP.NET Core 11

A complete guide to TokenValidationParameters in ASP.NET Core 11: how ValidateIssuer, ValidateAudience, and ValidateLifetime work, what the defaults actually are, why Authority auto-configures the issuer and signing keys, the 5-minute ClockSkew trap, and how to read the IDX error codes when a valid-looking token is rejected.

2026-06-21 csharp dotnet dotnet-11

How to configure CORS for a JWT-protected API in ASP.NET Core 11

A complete guide to CORS for a bearer-token API in ASP.NET Core 11: the correct UseCors ordering relative to authentication, why a bearer token in the Authorization header is not a CORS credential, why AllowAnyHeader works but a manual wildcard does not cover Authorization, and how to keep preflight from failing.

2026-06-13 dotnet-11 csharp cryptography

X25519 Key Agreement Lands In-Box in .NET 11 Preview 5

.NET 11 Preview 5 adds a first-class X25519DiffieHellman type to System.Security.Cryptography, so you can do Curve25519 key exchange without BouncyCastle or NSec.

2026-06-08 claude-code ai-agents security

Claude Code's Security-Guidance Plugin Reviews Its Own Diffs Before You Commit

Anthropic shipped a free security-guidance plugin for Claude Code that scans the agent's own edits for vulnerabilities in three layers, from a no-cost pattern match to an agentic review on commit.

2026-05-20 dotnet dotnet-10 nuget

NuGet Package Pruning Is On by Default in .NET 10

NuGet Package Pruning shipped on-by-default for net10.0 projects, cutting transitive vulnerability reports by 70% and restore times by up to 50%.