# Keycloak 26.6.2 released

DevFeed: [Keycloak 26.6.2 released](<https://devfeed.tech/articles/keycloak-26-6-2-released-31772.md>)

Original publisher: [Read original article](<https://www.keycloak.org/2026/05/keycloak-2662-released>)

Author: Keycloak Team

Published: 2026-05-19T00:00:00Z

Content type: release

Language: en

Sources: [Keycloak Blog](<https://devfeed.tech/sources/keycloak-blog.md>)

Topics: [Keycloak](<https://devfeed.tech/topics/keycloak.md>), [Vulnerabilities](<https://devfeed.tech/topics/vulnerabilities.md>), [Security](<https://devfeed.tech/topics/security.md>), [Authentication](<https://devfeed.tech/topics/authentication.md>), [OpenID connect (OIDC)](<https://devfeed.tech/topics/oidc.md>), [WebAuthn](<https://devfeed.tech/topics/webauthn.md>), [XSS](<https://devfeed.tech/topics/xss.md>)

Tags: [2](<https://devfeed.tech/tags/2.md>), [2026](<https://devfeed.tech/tags/2026.md>), [idm](<https://devfeed.tech/tags/idm.md>), [kerberos](<https://devfeed.tech/tags/kerberos.md>), [keycloak](<https://devfeed.tech/tags/keycloak.md>), [keycloak-release](<https://devfeed.tech/tags/keycloak-release.md>), [ldap](<https://devfeed.tech/tags/ldap.md>), [oidc](<https://devfeed.tech/tags/oidc.md>), [openid-connect](<https://devfeed.tech/tags/openid-connect.md>), [permission](<https://devfeed.tech/tags/permission.md>), [pii](<https://devfeed.tech/tags/pii.md>), [release](<https://devfeed.tech/tags/release.md>), [saml](<https://devfeed.tech/tags/saml.md>), [security](<https://devfeed.tech/tags/security.md>), [sso](<https://devfeed.tech/tags/sso.md>), [vulnerability](<https://devfeed.tech/tags/vulnerability.md>), [xss](<https://devfeed.tech/tags/xss.md>)

## AI overview

Keycloak 26.6.2 is a security-focused release that fixes multiple vulnerabilities, including denial-of-service issues, request smuggling, access-control flaws, stored XSS, WebAuthn policy bypass, token disclosure, account takeover, and PII enumeration. It also includes enhancements and bug fixes.

## Source excerpt

To download the release go to Keycloak downloads. Upgrading Before upgrading refer to the migration guide for a complete list of changes. All resolved issues Security fixes #47485 CVE-2026-33871 HTTP/2 CONTINUATION Frame Flood Denial of Service #47486 CVE-2026-33870 RFC violation: HTTP Request Smuggling primitive via Chunked Extension Quoted-String Parsing #47932 [CVE-2026-4628] Improper Access Control on Keycloak Server through UMA resource management endpoints via PUT parameters authorization-services #48049 [CVE-2026-37980] Stored XSS in select-organization.ftl - FreeMarker HTML-escape insufficient in inline JS handler organizations #48275 CVE-2026-5588 Bouncy Castle Crypto Package For Java: Use of a Broken or Risky Cryptographic Algorithm vulnerability in bcpkix modules core #48388 [CVE-2026-6856] Acceptable AAGUID policy bypass via packed self-attestation in WebAuthn registration authentication/webauthn #48570 [CVE-2026-0636, CVE-2026-3505, CVE-2026-5598] Multiple bouncycastle CVEs core #49108 [CVE-2026-7307] Denial of service when sending a crafted request to the /saml endpoint #49109 [CVE-2026-7504] Security Vulnerability Report: Redirect URI Validation Bypass in Keycloak #49110 [CVE-2026-7571] Access token disclosure and implicit flow bypass via forged client data #49111 [CVE-2026-7507] Session fixation in OIDC login flow leading to account takeover #49112 [CVE-2026-37982] Execute-actions token replay allows unauthorized WebAuthn credential enrollment on victim account #49113 [CVE-2026-37979] OIDC Introspection endpoint does not enforce audience restriction, leaking claims from lightweight access tokens #49114 [CVE-2026-37978] Cross-role PII leakage via evaluate-scopes endpoints bypasses user view permission #49115 [CVE-2026-4630] Keycloak Authorization Services Protection API IDOR (Cross-Resource Server Access) #49116 [CVE-2026-37981] Broken Access Control in Account Resources User Lookup allows PII enumeration Enhancements #47728 Monitor backups for CNPG -