Keycloak is one of the most popular open source IAM solutions – flexible, powerful and ideal for companies that need central authentication. However, precisely because Keycloak is so powerful, security gaps and configuration errors often arise in practice, which can be avoided with little effort.
2026, security is more important than ever: new CVEs, stricter compliance requirements (e.g. NIS2) and increasinglycomplex system landscapes make a well-thought-out security concept for Keycloak indispensable. This articlesummarizes 10 key best practices that every company should know and apply.
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Secure admin accounts consistently
The admin users are the most valuable target for attacks.
Recommended measures:
- Strong Password Policies
- Password Blacklist (prevents compromised passwords)
- IP Whitelisting for Admin access
- Activate MFA mandatory
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Activate Multi-Factor Authentication (MFA) for all critical areas
Not only admin accounts should use MFA – sensitive applications or particularly risky user groups also benefit from it.
Recommendation:
- WebAuthn (Passkeys, FIDO2)
- Smartcards
- App-based TOTP methods
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Activate protection against brute force attacks
Many installations have not optimally configured the Brute Force Detection.
Key Settings:
- Number of allowed incorrect attempts
- Lockout Duration
- Detection per user or IP
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Always install the latest Keycloak patches
The new versions regularly contain security-relevant fixes – in February 2026 alone, several CVEs were closed, includingvulnerabilities in SAML Brokering and potential DoS vectors.
Companies should:
- Establish automated update processes
- Use staging environments in advance
- Deploy Zero Downtime Deployment
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Managing secrets and key material professionally
No hardcoding, no static secrets.
Best Practices:
- Using a Secret Manager (Vault, AWS Secrets Manager, Azure Key Vault)
- Regular rotation
- Do not share via tickets, email or Slack
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Enable logging and monitoring (use OpenTelemetry)
With the new Open Telemetry integrations in Keycloak, central monitoring becomes significantly easier.
What should be logged?
- Login Events
- Failed Logins
- Administration Actions
- Token Events
- Federation Error
Tools: Grafana, Prometheus, Loki, Datadog, ELK, SIEM platforms.
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Configure the Reverse Proxy / Load Balancer correctly
Many problems arise from incorrectly set ProxyHeaders or missing HTTPS redirects.
Important:
- Enable the x-forwarded-headers header
- Force HTTPS
- Lock the admin path (/admin/)
- Activate Sticky Sessions as needed
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Securing the database and cluster
A Keycloak cluster stands and falls with the DB.
Empfohlene Maßnahmen:
- TLS between DB and Keycloak
- Separate DBUser with minimal rights
- Use replication or HADB
- Monitoring of Query Load and Cache Hit Rates
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Set CORS rules correctly
Incorrectly configured CORS headers are among the most common security vulnerabilities.
New:
Keycloak now allows improved CORS configuration with specific headers per environment.
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Use roles and groups in a structured way – no “database of wild growth”
Many security problems arise not from technology, but from chaotic role models:
Best Practices:
- Roles by function, not by person
- Clear separation of technical and professional roles
- Groups only for organizational units
- No permissive “admin” roles outside of IT
Summary: Keycloak 2026 is operated securely
Companies should focus on the following core areas:
- Activate security features
- Regularly update
- Set up professional logging
- Secure infrastructure and DB
- Consistently restrict admin access
Many measures are “quick wins” – with a big effect and small interventions.
Interested in a SecurityCheck or support with Keycloak?
The security of an IAM system depends not only on the software, but above all on correct configuration, operation, andregular updates. If you want to ensure that your Keycloak setup is optimally protected, scalable, and future-proof, we arehappy to support you.
What we offer at intension:
- 🔒 Keycloak Security Check (including analysis of config, flows, logs & infrastructure)
- ⚙️ Keycloak as a Service – fully managed, secure operation
- 🚀 easyCloak – greatly simplified, delegable administration
- 🧩 Consulting & implementation around role models, federation, SSO & MFA
- 🛠️ Theme and Flow Optimization
- 📈 Migration & Update Strategies for Keycloak 26.x and higher
We are looking forward to making your Keycloak setup safer, leaner, and more future-proof.
