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SaaS security

Security practices, vulnerability updates and authorization guidance.

Two email inboxes connected through a lock and verification checkpoint
9 min read

Secure Email Changes with Better Auth in Next.js 16

Build a two-step email change flow with Better Auth, Next.js, React Email and verification checks that protect both the current and new address.

Better AuthSaaS security
Authentication, two-factor and organization checkpoints connected to a verified test result
8 min read

Better Auth End-to-End Testing with Playwright in Next.js 16

Build reliable Playwright tests for Better Auth sign-in, TOTP, organization access, AI credit enforcement and admin authorization in a production Next.js SaaS.

Better AuthSaaS security
A protected application core receiving a security patch
2 min read

CVE-2026-23864 - React Server Components DoS Vulnerabilities

Multiple denial of service vulnerabilities discovered in React Server Components. All Achromatic starter kits updated to patched versions.

SaaS security
A protected application core inside a cracked outer shell
2 min read

React DoS & Source Code Exposure - Starter Kits Updated

Two new React Server Components vulnerabilities discovered. All Achromatic starter kits updated to patched versions.

SaaS security
A fractured application cube receiving a security shield patch
2 min read

All Starter Kits Upgraded to Next.js 16.0.7 - React2Shell Security Patch

We've upgraded all Achromatic starter kits to Next.js 16.0.7 to address the critical React2Shell vulnerability (CVE-2025-55182). Your projects are now protected against this maximum-severity security flaw.

SaaS security
Layered shields protecting an application and database core
3 min read

SaaS Security Best Practices for Next.js Applications

Essential security practices for building secure SaaS applications in Next.js. Covers authentication, authorization, data protection, API security, and common vulnerabilities.

Better AuthSaaS security
Three tenant compartments inside one shared application
3 min read

How to Implement Multi-Tenancy in Next.js: A Step-by-Step Guide

A practical guide to implementing multi-tenant architecture in Next.js. Learn database strategies, middleware patterns, and security considerations with working code examples.

SaaS security
Isolated and shared tenant database arrangements beneath an application
3 min read

Multi-Tenant Architecture Patterns in Next.js

Learn how to build multi-tenant SaaS applications in Next.js. Explore different tenant isolation strategies, database schemas, subdomain routing, and middleware patterns.

SaaS security