CVE-2026-9087

CVE-2026-9087 : In Keycloak, the cross-session verification proof is keyed only by (local userId, idpAlias) and is not bound to the upstream identity actually verified, allowing a second upstream account on the same IdP to be linked to the victim’s local account. Affected component: Keycloak auth...

EUVD-2026-31134

A flaw was found in Keycloak. The cross-session verification proof is keyed only by local userId, idpAlias and is not bound to the upstream identity that was actually verified, so a second upstream account on the same IdP can consume it and get linked to the victim's local account...

CVE-2026-9087

A flaw was found in Keycloak. The cross-session verification proof is keyed only by local userId, idpAlias and is not bound to the upstream identity that was actually verified, so a second upstream account on the same IdP can consume it and get linked to the victim's local account...

CVE-2026-9087

A flaw was found in Keycloak. The cross-session verification proof is keyed only by local userId, idpAlias and is not bound to the upstream identity that was actually verified, so a second upstream account on the same IdP can consume it and get linked to the victim's local account. Mitigation To...

Authorization Bypass Through User-Controlled Key

Overview org.keycloak:keycloak-services is an open source identity and access management solution for modern applications and services. Affected versions of this package are vulnerable to Authorization Bypass Through User-Controlled Key in the cross-session email verification process. An attacker...

Important: Red Hat Security Advisory: Red Hat build of Keycloak 26.4.12 Images Security Update

New images are available for Red Hat build of Keycloak 26.4.12 and Red Hat build of Keycloak 26.4.12 Operator, running on OpenShift Container Platform Red Hat build of Keycloak is an integrated sign-on solution, available as a Red Hat JBoss Middleware for OpenShift containerized image. The Red Ha...

org.keycloak/keycloak-services: Session fixation in OIDC login flow that can lead to account takeover

A session fixation vulnerability was found in Keycloak's login-actions endpoints. An unauthenticated attacker could exploit this flaw by pre-creating an authentication session and tricking a victim into visiting a maliciously crafted link. By leveraging the /login-actions/restart endpoint—which...

keycloak: Keycloak: Denial of Service via specially crafted SAML input

A flaw was found in Keycloak. A remote, unauthenticated attacker can send a specially crafted XML input to the Security Assertion Markup Language SAML endpoint. This malicious input can cause high CPU usage and worker thread starvation, leading to a Denial of Service DoS where the server becomes...

Important: Red Hat Security Advisory: Red Hat build of Keycloak 26.2.16 Security Update

New Red Hat build of Keycloak 26.2.16 packages are available from the Customer Portal Red Hat build of Keycloak 26.2.16 is a standalone server, based on the Keycloak project, that provides authentication and standards-based single sign-on capabilities for web and mobile applications. Security...

org.keycloak/keycloak-services: Open redirect when using wildcard valid redirect URIs in Keycloak

A flaw was found in Keycloak's URL validation logic during redirect operations. By crafting a malicious request, an attacker could bypass validation to redirect users to unauthorized URLs, potentially leading to the exposure of sensitive information within the domain or facilitating further...

keycloak: Keycloak: Denial of Service via specially crafted SAML input

A flaw was found in Keycloak. A remote, unauthenticated attacker can send a specially crafted XML input to the Security Assertion Markup Language SAML endpoint. This malicious input can cause high CPU usage and worker thread starvation, leading to a Denial of Service DoS where the server becomes...

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...

keycloak: org.keycloak.services: Keycloak: Information Disclosure via evaluate-scopes Admin API

A flaw was found in Keycloak. A low-privilege administrator with the 'view-clients' role can exploit this by invoking the 'evaluate-scopes' Admin API endpoints with an arbitrary user ID userId parameter. This vulnerability allows for cross-role personally identifiable information PII leakage,...

keycloak: org.keycloak.authentication: Keycloak: Unauthorized account takeover via WebAuthn token replay

A flaw was found in Keycloak. This authentication vulnerability allows a remote attacker to replay ExecuteActionsActionToken tokens within Keycloak's WebAuthn Web Authentication flow. By intercepting an execute-actions email link, an attacker can register their own authenticator to a victim's...

org.keycloak/keycloak-services: Open redirect when using wildcard valid redirect URIs in Keycloak

A flaw was found in Keycloak's URL validation logic during redirect operations. By crafting a malicious request, an attacker could bypass validation to redirect users to unauthorized URLs, potentially leading to the exposure of sensitive information within the domain or facilitating further...

org.keycloak/keycloak-services: Session fixation in OIDC login flow that can lead to account takeover

A session fixation vulnerability was found in Keycloak's login-actions endpoints. An unauthenticated attacker could exploit this flaw by pre-creating an authentication session and tricking a victim into visiting a maliciously crafted link. By leveraging the /login-actions/restart endpoint—which...

keycloak: org.keycloak.authorization: Keycloak: Information disclosure via broken access control in user lookup endpoint

A flaw was found in Keycloak. A broken access control vulnerability in the Account Resources user lookup endpoint allows a remote authenticated user, who owns at least one User-Managed Access UMA resource, to enumerate and harvest personally identifiable information PII for all realm users. By...

keycloak: Keycloak: Unauthorized resource access and data modification via Insecure Direct Object Reference

A flaw was found in Keycloak. An authenticated client could exploit an Insecure Direct Object Reference IDOR vulnerability in the Authorization Services Protection API endpoint. By knowing or obtaining a resource's unique identifier UUID belonging to another Resource Server within the same realm,...

keycloak: Keycloak: Information disclosure via OIDC token introspection endpoint audience bypass

A flaw was found in Keycloak. This access control vulnerability in Keycloak's OpenID Connect OIDC token introspection endpoint allows a confidential client to bypass audience restrictions. An attacker-controlled client with valid credentials can retrieve sensitive token claims intended for other...

keycloak: Keycloak: Access token disclosure and implicit flow bypass via forged client data

A flaw was found in Keycloak. A low-privilege user, with knowledge of user credentials and client ID, can bypass a security control intended to disable the implicit flow in OpenID Connect OIDC clients. By manipulating client data during a session restart, an attacker can obtain an access token th...