Impact Score: 5/10
Keycloak 26.5.3 — Release Notes & Engineering Impact
Source available — automated, not human-reviewed
Component: keycloak · Channel: stable. Automated analysis, not a compatibility certification. How this works.
Analysis updated: 2026-11-01.
⚡ Executive Summary (TL;DR)
Keycloak 26.5.3. Source highlight: Before upgrading refer to
Who Does This Impact? (Role-Based Analysis)
💻 Software Engineers & Devs
Check the source notes against the package and APIs you use before upgrading.
📊 Product & Engineering Leads
Use the documented changes to assess relevance to your product; release frequency alone is not a quality measure.
⚙️ DevOps & Security
Verify the target version, runtime requirements and rollback procedure in the official documentation.
📄 View Raw Release Notes (Original Developer Log)
<div>
<h2>Upgrading</h2>
<p>Before upgrading refer to <a href="https://www.keycloak.org/docs/latest/upgrading/#migration-changes">the migration guide</a> for a complete list of changes.</p>
<h2>All resolved issues</h2>
<h3>Security fixes</h3>
<ul>
<li><a href="https://github.com/keycloak/keycloak/issues/46144">#46144</a> CVE-2026-1609 Disabled users can still obtain tokens via JWT Authorization Grant </li>
<li><a href="https://github.com/keycloak/keycloak/issues/46145">#46145</a> CVE-2026-1529 Forged invitation JWT enables cross-organization self-registration </li>
<li><a href="https://github.com/keycloak/keycloak/issues/46146">#46146</a> CVE-2026-1486 Logic Bypass in JWT Authorization Grant Allows Authentication via Disabled Identity Providers </li>
<li><a href="https://github.com/keycloak/keycloak/issues/46147">#46147</a> CVE-2025-14778 Incorrect ownership checks in /uma-policy/ </li>
</ul>
<h3>Enhancements</h3>
<ul>
<li><a href="https://github.com/keycloak/keycloak/issues/45892">#45892</a> Upgrade minikube for CI tests <code>operator</code></li>
</ul>
<h3>Bugs</h3>
<ul>
<li><a href="https://github.com/keycloak/keycloak/issues/44379">#44379</a> Node.js admin client does not refresh tokens <code>admin/client-js</code></li>
<li><a href="https://github.com/keycloak/keycloak/issues/45459">#45459</a> k8s multiple restart (oomkilled) in v26.5.0-0 during startup because of RAM <code>dist/quarkus</code></li>
<li><a href="https://github.com/keycloak/keycloak/issues/45662">#45662</a> Increase in startup memory consumption in post 26.5 versions <code>dist/quarkus</code></li>
<li><a href="https://github.com/keycloak/keycloak/issues/45677">#45677</a> Hibernate Validator is enabled by default when not used <code>dist/quarkus</code></li>
<li><a href="https://github.com/keycloak/keycloak/issues/45708">#45708</a> Unpexted value '' in mixed-cluster-compatibility-tests <code>testsuite</code></li>
<li><a href="https://github.com/keycloak/keycloak/issues/45745">#45745</a> mixed-cluster-compatibility-tests fail due to incorrectly masked content in 26.5 branch <code>ci</code></li>
<li><a href="https://github.com/keycloak/keycloak/issues/45755">#45755</a> Broken YAML indentation in operator rolling updates doc <code>docs</code></li>
<li><a href="https://github.com/keycloak/keycloak/issues/45780">#45780</a> Remove fatal log messages from `ConsistentHash` </li>
</ul>
</div>