Summary
Ein Angreifer kann mehrere Schwachstellen in Keycloak ausnutzen, um Sicherheitsvorkehrungen zu umgehen, um einen Denial of Service Angriff durchzuführen und um einen Cross-Site Scripting Angriff durchzuführen.
Product
Keycloak ermöglicht Single Sign-On mit Identity and Access Management für moderne Anwendungen und Dienste.
Vulnerabilities 26
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Critical 9.1CVE-2026-117691 Public exploit
Keycloak-services: keycloak-services: saml redirect binding signature bypass via percent-encoded parameter names
A flaw was found in the SAML HTTP-Redirect binding implementation of Keycloak. The issue occurs because the server processes percent-encoded parameter names (like %53AMLResponse) while the signature verification logic only checks literal parameter names. An a…
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High 8.8
Keycloak-services: keycloak-services: unverified idp email auto-linking enables account takeover
A flaw was found in the idp-auto-link authenticator of the keycloak-services component, which handles user identity federation. The issue occurs when Keycloak automatically links an incoming identity from an external provider to an existing local account base…
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High 8.1
Keycloak-services: keycloak-services: account takeover via stale sso_auth note in organization identity-first login
A flaw was found in the Organization identity-first login flow of the Keycloak authentication server. Keycloak is an open-source identity and access management solution used to secure modern applications and services. The issue occurs when an attacker who bel…
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High 8.1
Keycloak-services: keycloak-services: uma protection api resourcetype field not validated — cross-owner resource access
A flaw was found in the UserManagedPermissionService of the Keycloak authorization server. The UMA Protection API, which manages user permissions, fails to validate the resourceType field when a user creates a new policy. This allows an attacker to create a p…
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High 8.1
Keycloak-services: keycloak-services: dcr protocol mapper config not validated, allowing iat holders to forge sub and aud claims in signed tokens
Keycloak provides a Dynamic Client Registration feature that allows users with specific tokens to register their own applications. A flaw in how Keycloak validates these registration requests allows an attacker to create a malicious application that forges id…
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High 8.0
Org.keycloak/keycloak-admin-cli: keycloak-admin-cli: kcadm custom truststore accepts arbitrary self-signed certificates
A flaw was found in the Keycloak Admin CLI kcadm tool, which is used by administrators to manage Keycloak servers from the command line. When a custom truststore is provided to verify the server identity, the tool incorrectly accepts any self-signed certifica…
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High 7.5
Keycloak-services: keycloak-services: account takeover via authentication race using reset-credentials path
A flaw was found in the authentication session handling of the keycloak-services component in Keycloak. The issue occurs because the system fails to verify if an authenticator is valid for the current authentication flow when switching between the standard au…
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High 7.5
Keycloak-services: keycloak-services: unauthenticated cpu denial of service via saml xml datetime and duration parsing
A flaw was found in the SAML XML processing component of Keycloak, an open-source identity and access management solution. The issue occurs when the server parses XML documents containing excessively long dateTime or duration values. Because these strings are…
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High 7.5
Keycloak-services: keycloak-services: unauthenticated cpu exhaustion via saml 1.1 keyinfo infinite loop
A flaw was found in the SAML 1.1 XML parsing logic of Keycloak, an open-source identity and access management solution. The issue occurs when the parser encounters unexpected elements within a security token's key information section, causing the processing t…
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High 7.5
Keycloak-services: keycloak-services: unauthenticated jvm termination via saml 1.1 authoritybinding parsing loop
A flaw was found in the SAML 1.1 assertion parser of Keycloak, a tool used for identity and access management. The issue occurs when the parser handles a specific element called AuthorityBinding within an authentication statement. Due to an incomplete fix for…
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High 7.5
Keycloak-services: keycloak-services: unauthenticated persistent disk exhaustion via theme gzip cache
A flaw was found in the theme resource endpoint of Keycloak, an open-source identity and access management solution. The issue occurs because the server fails to validate theme names before using them as keys for an on-disk gzip cache. An unauthenticated atta…
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High 7.5
Keycloak-services: keycloak-services: unauthenticated denial of service via saml soap endpoint unbounded xml parsing
A flaw was found in the SAML implementation of Keycloak, an open-source identity and access management solution. The SAML Artifact Resolution and ECP SOAP endpoints do not properly limit the size or complexity of incoming XML requests. An unauthenticated remo…
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High 7.4
Keycloak-services: keycloak-services: saml broker accepts holder-of-key assertions without proof of key possession
A flaw was found in the SAML identity broker component of Keycloak, which is used to delegate authentication to external identity providers. The issue occurs because the broker fails to verify that a user actually possesses the private key associated with a h…
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High 7.4
Keycloak-core: keycloak-core: saml adapter does not bind signed assertions to the configured identity provider issuer
A flaw was found in the SAML adapter component of Keycloak, which is used to secure applications with SAML-based authentication. The adapter fails to verify that the issuer of a signed SAML assertion matches the expected identity provider configured for the a…
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High 7.1
Keycloak-services: keycloak-services: client manager can substitute sessionless token principal via hardcoded-claim mappers to obtain realm administrator authority
A flaw was found in the protocol mapper and identity resolution components of Keycloak. The issue occurs when a client manager uses hardcoded-claim mappers to override identity claims in sessionless service-account tokens. Because these tokens lack a session …
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Medium 6.8
Keycloak-services: keycloak-services: injection of roles into realm default-roles via dcr endpoint
A flaw was found in Keycloak. The Dynamic Client Registration (DCR) endpoint does not properly validate authorization when processing the deprecated defaultRoles field. An authenticated attacker with client creation privileges or an Initial Access Token (IAT)…
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Medium 6.8
Keycloak-services: keycloak-services: admin api missing audience check
A flaw was found in the Admin REST API of Keycloak, an identity and access management solution. The Admin API fails to verify the intended audience of bearer tokens during authentication. This issue allows an attacker who operates a client within a realm to c…
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Medium 6.8
Keycloak-services: keycloak-services: ciba sub parameter injection causes attacker authentication to issue victim tokens
A flaw was found in the Client-Initiated Backchannel Authentication (CIBA) implementation of Keycloak. The CIBA endpoint fails to properly validate the sub parameter, allowing it to be stored as an additional request parameter. During the token issuance proce…
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Medium 6.5
Keycloak-services: keycloak-services: dcr registration-time claim-path gap allows forging realm_access.roles
A flaw was found in the Dynamic Client Registration component of Keycloak, an open-source identity and access management solution. The issue occurs because the system does not properly restrict which claim names can be used when setting up new clients. An att…
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Medium 6.5
Keycloak-services: keycloak-services: protocol mapper with jsontype=json bypasses token sanitization
A flaw was found in the token sanitization logic of Keycloak, an open source identity and access management solution. The issue occurs when a protocol mapper is configured to emit structured claims using the JSON type. The security check designed to remove un…
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Medium 6.4
Keycloak-services: keycloak-services: oidc logout endpoint session fixation via id_token_hint leading to account takeover
A flaw was found in the OIDC logout endpoint of the keycloak-services component, which handles user session termination in Red Hat Build of Keycloak. The issue occurs because the system sets a session cookie based on an unvalidated token hint before completin…
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Medium 6.4
Keycloak-services: keycloak-services: dcr azp and sid claim substitution allows account rest session takeover
A flaw was found in the Keycloak Account REST API where it incorrectly handles session identification. A malicious client owner can manipulate their own security tokens to point to a different user's active session. This allows the attacker to access and modi…
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Medium 5.4
Keycloak-services: keycloak-services: indefinite access token renewal via standard token exchange v2
A flaw was found in the token exchange mechanism of Keycloak. When using Standard Token Exchange V2, the system issues new tokens with a fresh lifetime based on the requester clients configuration instead of limiting it to the original tokens expiration. This…
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Medium 4.9
Keycloak-services: keycloak-services: saml broker ignores proxyrestriction delegation constraints
A flaw was found in the SAML brokering component of Keycloak, an identity and access management solution. The issue occurs when Keycloak acts as an intermediary between an upstream identity provider and downstream services. Keycloak fails to respect specific …
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Medium 4.8
Keycloak-services: keycloak-services: login-failure upsert trusts mysql/mariadb affected-row count
A flaw was found in the login-failure storage component of Keycloak, the identity and access management solution. This issue specifically affects deployments using MySQL or MariaDB databases in a multi-node configuration. When multiple failed login attempts o…
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Medium 4.2
Keycloak-services: keycloak-services: stateless token preferred_username fallback enables identity rebinding
A flaw was found in the TokenManager component of Keycloak, an open-source identity and access management solution. The issue occurs during the validation of stateless access tokens when the original user ID no longer exists. Keycloak incorrectly falls back t…
Revision history
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#3
Referenz(en) aufgenommen: EUVD-2026-123400
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#2
Neue Updates von Red Hat aufgenommen
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#1
Initiale Fassung
References
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Keycloak 26.8.2 Release Notes vom 2026-11-05
https://www.keycloak.org/2026/11/keycloak-2682-released
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Red Hat Security Advisory RHSA-2026:95759 vom 2026-11-06
https://access.redhat.com/errata/RHSA-2026:95759
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Red Hat Security Advisory RHSA-2026:95760 vom 2026-11-06
https://access.redhat.com/errata/RHSA-2026:95760
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Red Hat Security Advisory RHSA-2026:95761 vom 2026-11-06
https://access.redhat.com/errata/RHSA-2026:95761
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Red Hat Security Advisory RHSA-2026:96040 vom 2026-11-07
https://access.redhat.com/errata/RHSA-2026:96040
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Red Hat Security Advisory RHSA-2026:96039 vom 2026-11-07
https://access.redhat.com/errata/RHSA-2026:96039
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Red Hat Security Advisory RHSA-2026:96038 vom 2026-11-07
https://access.redhat.com/errata/RHSA-2026:96038
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Red Hat Security Advisory RHSA-2026:96037 vom 2026-11-07
https://access.redhat.com/errata/RHSA-2026:96037
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Red Hat Security Advisory RHSA-2026:95762 vom 2026-11-06
https://access.redhat.com/errata/RHSA-2026:95762