711d688294
# Which Problems Are Solved When resolving the organization for a self-registration, the resource owner was determined only from an explicitly requested org, falling back to the default org. The login policy applied to the same request, however, is resolved from the requested org, the user org, and only then the default org. As a result the two could diverge — e.g. after the login context had already resolved a user's organization — and a user could be registered in a different organization than the one whose settings were evaluated for the request. # How the Problems Are Solved `determineResourceOwner` now uses the same resolution order as the policy lookup (requested org, then user org, then default org), so the organization a user is registered in matches the one the request was evaluated against. # Additional Changes Added a unit test covering the resolution order. # Additional Context Aligns login v1 registration org resolution with the behavior in login v2. Co-authored-by: Claude Opus 4.8 <[email protected]>
The Identity Infrastructure for Developers
ZITADEL is an open-source identity and access management platform built for teams that need more than basic auth. Whether you're securing a SaaS product, building a B2B platform, or self-hosting a production IAM stack — ZITADEL gives you everything out of the box: SSO, MFA, Passkeys, OIDC, SAML, SCIM, and a battle-tested multi-tenancy model.
No vendor lock-in. No compromise on control. Just a robust, API-first identity platform you can own.
🏡 Website | 💬 Chat | 📋 Docs | 🧑💻 Blog | 📞 Contact
Why ZITADEL
We built ZITADEL to handle the hardest IAM challenges at scale — starting with multi-tenancy.
| ZITADEL | FusionAuth | Keycloak | Auth0/Okta | |
|---|---|---|---|---|
| Open-source | ✅ | ❌ | ✅ | ❌ |
| Self-hostable | ✅ | ✅ | ✅ | ❌ |
| Infrastructure-level tenants | ✅ Instances (High scale) | ✅ Tenants | 🟡 Realms (Scaling limits) | ❌ (Multi-tenant = multi-account) |
| B2B Organizations | ✅ Native & Unlimited | 🟡 via Entity Management | ✅ (Recent addition) | 🟡 (Plan/Account dependent) |
| Full audit trail | ✅ Comprehensive Event Stream* | 🟡 Audit logs | 🟡 Audit logs | 🟡 Audit logs |
| Passkeys (FIDO2) | ✅ | ✅ | ✅ | ✅ |
| Actions / webhooks | ✅ | ✅ | 🟡 via SPI | ✅ |
| API-first (gRPC + REST) | ✅ | 🟡 REST only | 🟡 REST only | 🟡 REST only |
| SaaS + self-host parity | ✅ | ✅ | ➖ N/A | ➖ N/A |
ZITADEL Cloud and self-hosted ZITADEL run the same codebase.
Key differentiators for architects:
- Relational core, event-driven soul — every mutation is written as an immutable event for a complete, API-accessible audit trail. Unlike systems that log only select activities, ZITADEL provides a comprehensive event stream that can be audited or streamed to external systems via Webhooks.
- Strict multi-tenant hierarchy — Identity System → Organizations → Projects, with isolated data and policy scoping at multiple levels
- API-first design — every resource and action is available via connectRPC, gRPC, and HTTP/JSON APIs
- Zero-downtime updates and horizontal scalability without external session stores
Get Started in 3 Minutes
ZITADEL Self-Hosted
# Docker Compose — up and running in under 3 minutes
curl -LO https://raw.githubusercontent.com/zitadel/zitadel/main/deploy/compose/docker-compose.yml \
&& curl -LO https://raw.githubusercontent.com/zitadel/zitadel/main/deploy/compose/.env.example \
&& cp .env.example .env \
&& docker compose up -d --wait
Full deployment guides:
Need professional support for your self-hosted deployment? Contact us.
ZITADEL Cloud (SaaS)
Start for free at zitadel.com — no credit card required. Available in US · EU · AU · CH. Pay-as-you-go pricing.
Integrate with the V2 API
ZITADEL exposes every capability over a typed API. Here's how to create a user with the V2 REST API:
curl -X POST https://$ZITADEL_DOMAIN/v2/users/human \
-H "Authorization: Bearer $ACCESS_TOKEN" \
-H "Content-Type: application/json" \
-d '{
"username": "[email protected]",
"profile": { "givenName": "Alice", "familyName": "Smith" },
"email": { "email": "[email protected]", "sendCode": {} }
}'
Explore the full API reference — including connectRPC and gRPC transports — or jump straight to quickstart examples.
Features
Authentication
- Single Sign On (SSO) · Username/Password · Passkeys (FIDO2 / WebAuthn)
- MFA: OTP, U2F, OTP Email, OTP SMS
- LDAP · Enterprise IdPs and social logins
- OpenID Connect certified · SAML 2.0 · Device authorization
- Machine-to-machine: JWT Profile, PAT, Client Credentials
- Token exchange and impersonation
- Custom sessions for flows beyond OIDC/SAML
- Hosted Login V2
Multi-Tenancy
- Identity brokering with pre-built IdP templates
- Customizable B2B onboarding with self-service for customers
- Delegated role management to third parties
- Domain discovery
Integration
- gRPC, connectRPC, and REST APIs for every resource
- Actions: webhooks, custom code, token enrichment
- RBAC · SCIM 2.0 Server
- Audit log and SOC/SIEM integration
- SDKs and example apps
Self-Service & Admin
- Self-registration with email/phone verification
- Administration Console for orgs and projects
- Custom branding per organization
Deployment
- PostgreSQL (≥ 14) · Zero-downtime updates · High scalability
Track upcoming features on our roadmap and follow our changelog for recent updates.
Showcase
Login V2
Our new, fully customizable login experience — documentation
Adopters & Ecosystem
Used in production by organizations worldwide. See the full Adopters list — and add yours by submitting a pull request.
- SDKs: All supported languages and frameworks
- Examples: Clone and use our examples
How To Contribute
ZITADEL is built in the open and welcoming to contributions of all kinds.
- 📖 Read the Contribution Guide to get started
- 💬 Join the conversation on Discord
- 🐛 Report bugs or request features via GitHub Issues
Contributors
Made with contrib.rocks.
Security
Security policy: SECURITY.md
Vulnerability Disclosure Policy — how to responsibly report security issues.
Technical Advisories are published for major issues that could impact security or stability in production.
License
AGPL-3.0 — see LICENSING.md for the full licensing policy, including Apache 2.0 and MIT exceptions for specific directories.