keycloak-services: keycloak-services: Predictable account-linking hash enables account takeover via malicious OIDC client

A flaw was found in the legacy client-initiated account-linking endpoint of Keycloak, a widely used open-source identity and access management solution. The mechanism used to protect the account-linking process from unauthorized requests relies on a hash that can be predicted by a malicious OIDC...

CVE-2026-16103

A flaw was found in the keycloak-services component of Keycloak. This issue is an incomplete fix for CVE-2026-9798, where brute-force protection checks were added to the Client-Initiated Backchannel Authentication CIBA initiation handler but were omitted from the token redemption handler. This...

EUVD-2026-45225

A flaw was found in the keycloak-services component of Keycloak. This issue is an incomplete fix for CVE-2026-9798, where brute-force protection checks were added to the Client-Initiated Backchannel Authentication CIBA initiation handler but were omitted from the token redemption handler. This...

CVE-2026-16103

A flaw was found in the keycloak-services component of Keycloak. This issue is an incomplete fix for CVE-2026-9798, where brute-force protection checks were added to the Client-Initiated Backchannel Authentication CIBA initiation handler but were omitted from the token redemption handler. This...

CVE-2026-9798

A flaw was found in Keycloak, an open-source identity and access management solution. When a user account is temporarily locked due to repeated failed login attempts, an attacker with valid client credentials can exploit the Client-Initiated Backchannel Authentication CIBA flow to bypass this...

EUVD-2026-32717

A flaw was found in Keycloak, an open-source identity and access management solution. When a user account is temporarily locked due to repeated failed login attempts, an attacker with valid client credentials can exploit the Client-Initiated Backchannel Authentication CIBA flow to bypass this...

CVE-2026-9798

A flaw was found in Keycloak, an open-source identity and access management solution. When a user account is temporarily locked due to repeated failed login attempts, an attacker with valid client credentials can exploit the Client-Initiated Backchannel Authentication CIBA flow to bypass this...

CVE-2026-9798

A flaw was found in Keycloak, an open-source identity and access management solution. When a user account is temporarily locked due to repeated failed login attempts, an attacker with valid client credentials can exploit the Client-Initiated Backchannel Authentication CIBA flow to bypass this...

Authentication Bypass by Primary Weakness

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 Authentication Bypass by Primary Weakness via the Client-Initiated Backchannel Authentication CIBA flow. An...

PT-2026-55154

A flaw was found in Keycloak, an open-source identity and access management solution. When a user account is temporarily locked due to repeated failed login attempts, an attacker with valid client credentials can exploit the Client-Initiated Backchannel Authentication CIBA flow to bypass this...

CLSA-2026-1778489013 spice: Fix of CVE-2021-20201

CVE-2021-20201: fix DoS via uncontrolled TLS renegotiation by disabling client-initiated renegotiation...

CVE-2026-32983

Wazuh Manager authd service in wazuh-manager packages through version 4.7.3 contains an improper restriction of client-initiated SSL/TLS renegotiation vulnerability that allows remote attackers to cause a denial of service by sending excessive renegotiation requests. Attackers can exploit the lac...

EUVD-2026-5130

A flaw was found in Keycloak’s CIBA feature where insufficient validation of client-configured backchannel notification endpoints could allow blind server-side requests to internal services...

EUVD-2025-36356

A flaw was found in Keycloak. This vulnerability allows an unauthenticated remote attacker to cause a denial of service DoS by repeatedly initiating TLS 1.2 client-initiated renegotiation requests to exhaust server CPU resources, making the service unavailable...

CVE-2025-11419: Allocation of Resources Without Limits or Throttling

A flaw was found in Keycloak. This vulnerability allows an unauthenticated remote attacker to cause a denial of service DoS by repeatedly initiating TLS 1.2 client-initiated renegotiation requests to exhaust server CPU resources, making the service unavailable...

tomcat: Apache Tomcat denial of service

A denial of service flaw was found in Apache Tomcat. A race condition during connection closure could trigger a JVM crash when using the APR/Native connector, leading to a denial of service. This issue was particularly noticeable with client-initiated closures of HTTP/2 connections...

tomcat: Apache Tomcat denial of service

A denial of service flaw was found in Apache Tomcat. A race condition during connection closure could trigger a JVM crash when using the APR/Native connector, leading to a denial of service. This issue was particularly noticeable with client-initiated closures of HTTP/2 connections...

tomcat: Apache Tomcat denial of service

A denial of service flaw was found in Apache Tomcat. A race condition during connection closure could trigger a JVM crash when using the APR/Native connector, leading to a denial of service. This issue was particularly noticeable with client-initiated closures of HTTP/2 connections...

CVE-2020-4042

Bareos before version 19.2.8 and earlier allows a malicious client to communicate with the director without knowledge of the shared secret if the director allows client initiated connection and connects to the client itself. The malicious client can replay the Bareos director's cram-md5 challenge...

CVE-2024-37309

CrateDB is a distributed SQL database. A high-risk vulnerability has been identified in versions prior to 5.7.2 where the TLS endpoint port 4200 permits client-initiated renegotiation. In this scenario, an attacker can exploit this feature to repeatedly request renegotiation of security parameter...