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CVE-2026-97175

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 based on an email address without verifying if the provider has validated that email. This can allow an attacker to take over a victim's account by using a matching unverified email address at a brokered provider.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
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Redhat
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CVE-2026-92855

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 holder-of-key assertion. An attacker who intercepts a victim signed assertion can replay it to gain unauthorized access and impersonate the victim without needing their private key.

CVSS 3.1 · 7.4 High EPSS < 1% KEV · Not listed
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Red Hat Redhat
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Red Hat Build Of Keycloak 26.4 Build Keycloak Build Of Keycloak and 2 more
CVE-2026-107602

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 thread to enter an infinite loop. An unauthenticated remote attacker could exploit this by sending specially crafted requests, leading to 100% CPU usage and a total denial of service that requires a server restart to resolve.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Red Hat Redhat
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Red Hat Build Of Keycloak 26.4 Build Keycloak Build Of Keycloak and 2 more
CVE-2026-76166

Modcluster-core: mod_cluster advertise listener: unauthenticated dos via crafted multicast datagram

A flaw was found in mod_cluster's AdvertiseListenerImpl (org.jboss.modcluster core module). A single crafted UDP multicast datagram with a valid HTTP status line and a "Server:" header but without the "Date:", "Digest:", and "Sequence:" headers triggers a NullPointerException in verifyDigest() that is not caught by the worker thread's exception handler. This causes the advertise listener thread to terminate permanently. The failure is silent (isListening() continues to return true) and persists until the node is restarted. The crash occurs before the AdvertiseSecurityKey comparison, so deployments with a configured security key are still affected.

CVSS 3.1 · 4.3 Medium EPSS 2.4% KEV · Not listed
Vendors
Redhat
Products
Jboss Enterprise Application Platform Jboss Enterprise Application Platform Expansion Pack Jboss Enterprise Web Server and 4 more
CVE-2026-97847

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 ID, Keycloak may incorrectly resolve the token bearer as a different, highly privileged user based on the manipulated claims. This can allow an attacker with limited client management permissions to impersonate a realm administrator and gain full control over the realm.

CVSS 3.1 · 7.1 High EPSS < 1% KEV · Not listed
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CVE-2026-92857

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 identity information. By mapping their own user profile details to protected fields like the user ID (sub) or intended audience (aud), an attacker can generate signed security tokens that make them appear to be a different user. This could allow an attacker to impersonate other users or gain unauthorized access to services that rely on these tokens for identity verification.

CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed
Vendors
Red Hat Redhat
Products
Red Hat Build Of Keycloak 26.4 Build Keycloak Build Of Keycloak and 2 more
CVE-2026-92856

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 security instructions called ProxyRestrictions in the login messages it receives. This allows a user to log into downstream services even when the original identity provider explicitly forbade further sharing of the login session. As a result, users can bypass security boundaries intended to limit where their identity can be used.

CVSS 3.1 · 4.9 Medium EPSS < 1% KEV · Not listed
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Redhat
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CVE-2026-110931

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 a previous vulnerability, the parser can enter an infinite loop that consumes all available memory, causing the entire Keycloak service to crash and become unavailable to users.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Red Hat Redhat
Products
Red Hat Build Of Keycloak 26.4 Build Keycloak Build Of Keycloak and 2 more
CVE-2026-96453

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 certificate as long as the hostname matches. This allows a network attacker to impersonate the Keycloak server, steal administrative credentials, and perform unauthorized management actions.

CVSS 3.1 · 8 High EPSS < 1% KEV · Not listed
Vendors
Redhat
Products
Amq Broker Build Keycloak Jboss Enterprise Application Platform and 4 more
CVE-2026-112208

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 belongs to multiple organizations initiates a login and then switches to a registration or password reset path. During this process, a flag indicating a successful login is not properly cleared when the user is removed from the session. An attacker can then provide a victim's username, and the system incorrectly treats the stale flag as proof of the victim's identity. This allows the attacker to bypass authentication and gain full access to the victim's account and connected applications.

CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed
Vendors
Red Hat Redhat
Products
Red Hat Build Of Keycloak 26.4 Build Keycloak Build Of Keycloak and 2 more
CVE-2026-120984

Keycloak-services: keycloak-services: manage-clients to arbitrary code execution through inline javascript policy import

A flaw was found in the Keycloak server's client management component. When a client is created or imported with authorization services enabled, the system fails to properly clear an internal session attribute used during the setup process. This allows an authenticated attacker with client management permissions to bypass security controls and upload a malicious JavaScript policy, which is then executed on the server when an authorization request is made. Successful exploitation could allow the attacker to run arbitrary code on the server, potentially compromising the entire system.

CVSS 3.1 · 9.1 Critical EPSS < 1% KEV · Not listed
Vendors
Red Hat Redhat
Products
Red Hat Build Of Keycloak 26.4 Build Keycloak Build Of Keycloak and 2 more
CVE-2026-117691

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 attacker can use this discrepancy to provide a crafted, unsigned SAML message that the server processes instead of a legitimately signed one, leading to full account takeover of federated users.

CVSS 3.1 · 9.1 Critical EPSS < 1% KEV · Not listed
Vendors
Red Hat Redhat
Products
Red Hat Build Of Keycloak 26.4 Build Keycloak Build Of Keycloak and 2 more
CVE-2023-5236

Infinispan: circular reference on marshalling leads to dos

A flaw was found in Infinispan, which does not detect circular object references when unmarshalling. An authenticated attacker with sufficient permissions could insert a maliciously constructed object into the cache and use it to cause out of memory errors and achieve a denial of service.

CVSS 3.1 · 4.4 Medium EPSS 1.1% KEV · Not listed
Vendors
Infinispan Redhat
Products
Infinispan Camel Quarkus Camel Spring Boot and 9 more
CVE-2026-18569

Keycloak-services: keycloak-services: oidc backchannel logout accepts unsigned forged logout tokens

A flaw was found in the backchannel logout endpoint of the keycloak-services component, which is part of the Red Hat Build of Keycloak. This component handles authentication and session management for applications. The issue occurs when an OIDC identity provider is configured to skip signature validation. In this specific setup, the system incorrectly accepts logout requests that have no cryptographic signature. An attacker who knows certain technical details about a user's session can use this flaw to force that user to be logged out, potentially disrupting their work.

CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed
Vendors
Redhat
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Build Keycloak Build Of Keycloak Jboss Data Grid and 3 more
CVE-2026-18206

Keycloak-services: keycloak-services: client policy source-host wildcard domain matching bypass

A flaw was found in the keycloak-services component of Keycloak, which provides identity and access management services. The issue occurs when a realm administrator uses a wildcard domain (like *.example.com) to restrict which hosts can register or update clients. Due to improper validation, the system accepts any hostname that ends with the specified domain suffix, even if it is not a legitimate subdomain. An attacker who can control the reverse DNS of their connection can bypass these host-based restrictions, potentially allowing unauthorized client modifications.

CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed
Vendors
Redhat
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Build Keycloak Build Of Keycloak Data Grid and 5 more
CVE-2024-5971

Undertow: response write hangs in case of java 17 tlsv1.3 newsessionticket

A vulnerability was found in Undertow, where the chunked response hangs after the body was flushed. The response headers and body were sent but the client would continue waiting as Undertow does not send the expected 0\r\n termination of the chunked response. This results in uncontrolled resource consumption, leaving the server side to a denial of service attack. This happens only with Java 17 TLSv1.3 scenarios.

CVSS 3.1 · 7.5 High EPSS 2.9% KEV · Not listed
Vendors
Redhat
Products
Apache Camel Hawtio Apache Camel Spring Boot Build Keycloak and 9 more
CVE-2026-84823

Org.wildfly.core: wildfly: path traversal in take-snapshot discloses the server configuration to the monitor role

A flaw was found in WildFly. A user with the `Monitor` role, which is the lowest standard Role-Based Access Control (RBAC) role, can exploit a path traversal vulnerability in the `take-snapshot` operation. By manipulating the `name` parameter, this user can write a copy of the server configuration to an arbitrary location. This allows the `Monitor` role to read back the server configuration, including sensitive credentials, which would otherwise be restricted by RBAC, leading to information disclosure.

CVSS 3.1 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Redhat
Products
Enterprise Linux Jboss Enterprise Application Platform Jboss Fuse and 2 more
CVE-2026-97367

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 modify the victim's account information, potentially leading to a full account takeover by changing the recovery email and resetting the password.

CVSS 3.1 · 6.4 Medium EPSS < 1% KEV · Not listed
Vendors
Redhat
Products
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CVE-2026-96447

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 to using the username to identify the user without verifying if the identity matches the original token subject. This could allow an attacker with an old token to gain access to a newly created service account if it shares the same client ID as a previously deleted one.

CVSS 3.1 · 4.2 Medium EPSS < 1% KEV · Not listed
Vendors
Redhat
Products
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CVE-2026-19688

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 capture an administrator's access token and reuse it to perform unauthorized administrative actions, potentially leading to full realm compromise.

CVSS 3.1 · 6.8 Medium EPSS < 1% KEV · Not listed
Vendors
Redhat
Products
Build Keycloak Red Hat Single Sign On