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CVE-2026-16442

Keycloak-services: keycloak-services: saml idp-initiated broker login bypasses link-only restriction

A flaw was found in the SAML broker component of Keycloak, which is used to manage identity federation and user authentication. The issue occurs because the IdP-initiated Single Sign-On endpoint fails to check if a provider is restricted to account linking only. This allows an attacker with control over a linked upstream identity to bypass login restrictions and gain full access to a local user account.

CVSS 3.1 · 7.4 High EPSS < 1% KEV · Not listed
Vendors
Redhat
Products
Build Keycloak Build Of Keycloak Data Grid 8 and 5 more
CVE-2026-16443

Keycloak-services: keycloak-services: saml broker metadata import disables response signature validation

A flaw was found in the SAML metadata import functionality of the keycloak-services component, which is the core engine for identity brokering in Red Hat Build of Keycloak. When importing identity provider metadata that lacks specific usage attributes for keys, the system incorrectly disables signature validation for SAML responses even if a signing certificate is provided. This issue allows an unauthenticated attacker to forge a SAML response and gain unauthorized access to a user account by knowing their external identifier.

CVSS 3.1 · 7.4 High EPSS < 1% KEV · Not listed
Vendors
Redhat
Products
Build Keycloak Build Of Keycloak Data Grid 8 and 5 more
CVE-2026-18967

Keycloak-services: keycloak-services: saml onetimeuse assertion replay in idp-initiated broker flow

A flaw was found in the SAML broker component of Keycloak, an identity and access management solution. When configured as a SAML broker using the IdP-Initiated flow, Keycloak fails to enforce the OneTimeUse condition in SAML assertions. This allows an attacker who captures a valid, unused assertion to replay it multiple times. Successful exploitation could allow an attacker to hijack a user's session and gain unauthorized access to the system as that user.

CVSS 3.1 · 6.4 Medium EPSS < 1% KEV · Not listed
Vendors
Redhat
Products
Build Keycloak Build Of Keycloak Jboss Enterprise Application Platform Expansion Pack and 3 more
CVE-2026-14209

Keycloak-admin-ui: keycloak-admin-ui:admin ui extension brute-force-user endpoint bypasses fgapv2 user view restrictions

A vulnerability was discovered in Keycloak's Admin UI extension that allows certain administrative users to bypass security restrictions. When Fine-Grained Admin Permissions (FGAPv2) are enabled, an administrator who should only be able to search for users (but not view their full details) can use a specific "brute-force-user" endpoint to access a user's full profile. This includes sensitive information and security metadata. The issue occurs because the system fails to check if the administrator has the required "view" permission for that specific user when using this particular search path.

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed
Vendors
Redhat
Products
Build Keycloak Build Of Keycloak Jboss Enterprise Application Platform Expansion Pack and 1 more
CVE-2024-12369

Elytron-oidc-client: oidc authorization code injection

A vulnerability was found in OIDC-Client. When using the RH SSO OIDC adapter with EAP 7.x or when using the elytron-oidc-client subsystem with EAP 8.x, authorization code injection attacks can occur, allowing an attacker to inject a stolen authorization code into the attacker's own session with the client with a victim's identity. This is usually done with a Man-in-the-Middle (MitM) or phishing attack.

CVSS 3.1 · 4.2 Medium EPSS < 1% KEV · Not listed
Vendors
Redhat
Products
Build Keycloak Jboss Enterprise Application Platform
CVE-2026-18211

Keycloak-services: keycloak-services: secure-client-uris policy bypass via localhost-prefixed domains

A flaw was found in the secure-client-uris client policy executor within Keycloak core services. This component is responsible for enforcing security requirements on client configurations, such as requiring encrypted connections for redirect URIs. Due to an improper check that only looks at the start of a web address rather than properly verifying the host, an attacker can bypass these security restrictions by using a specially crafted domain name. This could allow an attacker to intercept sensitive authentication codes over unencrypted connections.

CVSS 3.1 · 4.2 Medium EPSS < 1% KEV · Not listed
Vendors
Redhat
Products
Build Keycloak Build Of Keycloak Data Grid and 5 more
CVE-2026-14781

Keycloak-services: keycloak-services: oidc email_verified claim incorrectly applied to userinfo email

A flaw exists in the org.keycloak.broker.oidc package where the OIDC broker incorrectly synchronizes the email_verified claim. When an OIDC identity provider is configured with trustEmail=true and the userinfo endpoint is enabled, Keycloak retrieves the email address from the userinfo response but retrieves the email_verified status exclusively from the id_token. The root cause is a lack of validation ensuring that the email_verified claim in the id_token actually refers to the email address returned by the userinfo endpoint. If these two sources return different email addresses, the id_token's email_verified=true claim is blindly applied to the userinfo email. Exploitation Conditions: The OIDC identity provider must have trustEmail set to true (non-default). The userinfo endpoint must be enabled (default). The attacker must control or have compromised the upstream OIDC provider. Concrete Impact: Mark arbitrary email addresses as verified in the Keycloak database. Bypass email-based security controls or verification workflows. Potential account takeover if the application relies solely on the email_verified flag from the IdP to link accounts.

CVSS 3.1 · 4.8 Medium EPSS < 1% KEV · Not listed
Vendors
Redhat
Products
Build Keycloak Build Of Keycloak Data Grid and 5 more
CVE-2026-1609

Org.keycloak/keycloak-quarkus-server: keycloak: unauthorized access via jwt authorization grant with disabled users

A flaw was found in Keycloak. When the JSON Web Token (JWT) authorization grant preview feature is enabled and a user account is disabled, Keycloak fails to validate the user’s disabled status during JWT authorization grant processing. A remote attacker with low privileges can exploit this improper access control vulnerability by presenting a valid assertion token from an external identity provider to obtain a JWT for a disabled user. This allows unauthorized access to sensitive resources.

CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed
Vendors
Keycloak Redhat
Products
Keycloak-quarkus-server Build Of Keycloak Jboss Enterprise Application Platform and 1 more
CVE-2025-12799

Jastow: jastow cross-site scripting attack due to unsanitized uri

A flaw was found in Jastow. Jastow is vulnerable to Cross-Site Scripting (XSS) attack. If using a set of combined configuration to allow unescaped characters in URL with embedded Undertow and Jastow, a server might be vulnerable to improper input handling.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Redhat
Products
Jboss Enterprise Application Platform Jbosseapxp Red Hat Single Sign On
CVE-2026-3260

undertow: Undertow: Denial of Service due to premature multipart/form-data parsing in GET requests

The Undertow web server enforces a default maximum HTTP request entity size limit. Any request (including GET or HEAD) containing a body that exceeds this configurable limit is safely dropped by the server, preventing single-request Resource Exhaustion (Out of Memory) Denial of Service attacks.

CVSS 3.1 · 5.9 Medium EPSS n/a KEV · Not listed
Vendors
Redhat
Products
Build Of Apache Camel - Hawtio Build Of Apache Camel For Spring Boot Data Grid and 7 more
CVE-2026-11577

keycloak: keycloak: privilege escalation via partialImport FGAP permission bypass

The reported behavior does not constitute a privilege escalation. Exploitation requires the attacker to already possess the manage-realm administrative role within the realm-management client. By design, the manage-realm role is intended to be equivalent in administrative authority to realm-admin. A user with manage-realm already has full administrative control over the realm. Therefore, importing users with realm-admin role mappings through POST /admin/realms/{realm}/partialImport does not grant any additional privileges beyond those already held by the administrator and does not represent a security vulnerability.

CVSS 3.1 · 7.2 High EPSS n/a KEV · Not listed
Vendors
Redhat
Products
Build Of Keycloak Data Grid Jboss Enterprise Application Platform and 2 more
CVE-2026-11800

Org.keycloak:keycloak-services: keycloak: authentication bypass via jwt algorithm confusion

A flaw was found in Keycloak. This JWT algorithm confusion vulnerability in the JWT Authorization Grant flow allows an attacker with valid client credentials to bypass signature verification. By forging an assertion, the attacker can create unauthorized access tokens. This enables the attacker to impersonate any federated user linked to the affected Identity Provider, leading to unauthorized access and potential privilege escalation.

CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed
Vendors
Redhat
Products
Build Keycloak Build Of Keycloak Data Grid and 4 more
CVE-2026-4874

Org.keycloak.protocol.oidc.grants: org.keycloak.services.managers: keycloak: server-side request forgery via oidc token endpoint manipulation

A flaw was found in Keycloak. An authenticated attacker can perform Server-Side Request Forgery (SSRF) by manipulating the `client_session_host` parameter during refresh token requests. This occurs when a Keycloak client is configured to use the `backchannel.logout.url` with the `application.session.host` placeholder. Successful exploitation allows the attacker to make HTTP requests from the Keycloak server’s network context, potentially probing internal networks or internal APIs, leading to information disclosure.

CVSS 3.1 · 3.1 Low EPSS < 1% KEV · Not listed
Vendors
Redhat
Products
Build Keycloak Build Of Keycloak Jboss Enterprise Application Platform and 4 more
CVE-2025-2251

Org.jboss.eap:wildfly-ejb3: improper deserialization in jboss marshalling allows remote code execution

A security flaw exists in WildFly and JBoss Enterprise Application Platform (EAP) within the Enterprise JavaBeans (EJB) remote invocation mechanism. This vulnerability stems from untrusted data deserialization handled by JBoss Marshalling. This flaw allows an attacker to send a specially crafted serialized object, leading to remote code execution without requiring authentication.

CVSS 3.1 · 6.2 Medium EPSS 1.1% KEV · Not listed
Vendors
Redhat
Products
Jboss Enterprise Application Platform Jbosseapxp
CVE-2022-41881

codec-haproxy: HAProxyMessageDecoder Stack Exhaustion DoS

Netty project is an event-driven asynchronous network application framework. In versions prior to 4.1.86.Final, a StackOverflowError can be raised when parsing a malformed crafted message due to an infinite recursion. This issue is patched in version 4.1.86.Final. There is no workaround, except using a custom HaProxyMessageDecoder.

CVSS 3.1 · 5.3 Medium EPSS 1.6% KEV · Not listed
Vendors
Debian Netty Redhat
Products
Debian Linux Netty Camel Quarkus and 11 more
CVE-2017-12174

artemis/hornetq: memory exhaustion via UDP and JGroups discovery

It was found that when Artemis and HornetQ before 2.4.0 are configured with UDP discovery and JGroups discovery a huge byte array is created when receiving an unexpected multicast message. This may result in a heap memory exhaustion, full GC, or OutOfMemoryError.

CVSS 3.1 · 7.5 High EPSS 6.1% KEV · Not listed
Vendors
Apache Redhat
Products
Artemis Enterprise Linux Hornetq and 2 more
CVE-2016-4978

Artemis: Deserialization of untrusted input vulnerability

The getObject method of the javax.jms.ObjectMessage class in the (1) JMS Core client, (2) Artemis broker, and (3) Artemis REST component in Apache ActiveMQ Artemis before 1.4.0 might allow remote authenticated users with permission to send messages to the Artemis broker to deserialize arbitrary objects and execute arbitrary code by leveraging gadget classes being present on the Artemis classpath.

CVSS 3.1 · 7.2 High EPSS 6.9% KEV · Not listed
Vendors
Apache Redhat
Products
Artemis Enterprise Linux Server Jboss Enterprise Application Platform
CVE-2026-41731

In Spring for Apache Kafka, overly broad trusted-package matching in header mappers exposes JDK classes to deserialization

JsonKafkaHeaderMapper and the deprecated DefaultKafkaHeaderMapper matched type headers against trusted packages using a prefix check, meaning that trusting any package implicitly trusted all of its subpackages. Combined with Jackson's default bean deserialization, a producer could supply crafted header values that caused the consumer to deserialize arbitrary JDK types. Affected versions: Spring for Apache Kafka 4.0.0 through 4.0.5; 3.3.0 through 3.3.15; 3.2.0 through 3.2.13; 2.9.0 through 2.9.13; 2.8.0 through 2.8.11.

CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed
Vendors
Redhat Spring Vmware
Products
Fuse Jboss Enterprise Application Platform Expansion Pack Spring For Apache Kafka and 1 more
CVE-2026-4366

Keycloak-services: blind server-side request forgery (ssrf) via http redirect handling in keycloak

A flaw was identified in Keycloak, an identity and access management solution, where it improperly follows HTTP redirects when processing certain client configuration requests. This behavior allows an attacker to trick the server into making unintended requests to internal or restricted resources. As a result, sensitive internal services such as cloud metadata endpoints could be accessed. This issue may lead to information disclosure and enable attackers to map internal network infrastructure.

CVSS 3.1 · 5.8 Medium EPSS < 1% KEV · Not listed
Vendors
Redhat
Products
Build Keycloak Build Of Keycloak Jboss Enterprise Application Platform and 4 more