Keycloak security vulnerabilities

Keycloak is an open-source identity and access management solution developed by Keycloak itself. There is a security vulnerability in Keycloak. This vulnerability arises when authenticated low-privilege users can send excessively large SubjectToken JWT tokens to the TokenEndpoint. When the token...

Keycloak: Insufficient verification proof scoping enables identity provider account linking attack and account compromise

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...

org.keycloak:keycloak-account-freemarker (1.0.2.final), org.keycloak:keycloak-dependencies-server-all (1.0.2.final) +3 more potentially affected by CVE-2026-9087 via org.keycloak:keycloak-services (1.0.2.final)

org.keycloak:keycloak-services MAVEN version 1.0.2.final is affected by a known vulnerability. The following packages have a transitive dependency on org.keycloak:keycloak-services and may be impacted: - org.keycloak:keycloak-account-freemarker 1.0.2.final -...

org.keycloak:keycloak-authz-policy-drools (3.2.1.final), org.keycloak:keycloak-dependencies-server-all (3.2.1.final) +6 more potentially affected by CVE-2026-9087 via org.keycloak:keycloak-services (3.2.1.final)

org.keycloak:keycloak-services MAVEN version 3.2.1.final is affected by a known vulnerability. The following packages have a transitive dependency on org.keycloak:keycloak-services and may be impacted: - org.keycloak:keycloak-authz-policy-drools 3.2.1.final -...

com.github.vzakharchenko:chillispot-radius-plugin (1.3.16), com.github.vzakharchenko:cisco-radius-plugin (1.3.16) +24 more potentially affected by CVE-2026-9087 via org.keycloak:keycloak-services (16.0.0)

org.keycloak:keycloak-services MAVEN version 16.0.0 is affected by a known vulnerability. The following packages have a transitive dependency on org.keycloak:keycloak-services and may be impacted: - com.github.vzakharchenko:chillispot-radius-plugin 1.3.16 -...

GHSA-M6QJ-3MPP-57V8 Keycloak: Insufficient verification proof scoping enables identity provider account linking attack and account compromise

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...

org.keycloak:keycloak-dependencies-server-all (11.0.1), org.keycloak:keycloak-dependencies-server-min (11.0.1) +6 more potentially affected by CVE-2026-9087 via org.keycloak:keycloak-services (11.0.1)

org.keycloak:keycloak-services MAVEN version 11.0.1 is affected by a known vulnerability. The following packages have a transitive dependency on org.keycloak:keycloak-services and may be impacted: - org.keycloak:keycloak-dependencies-server-all 11.0.1 - org.keycloak:keycloak-dependencies-server-m...

org.keycloak:keycloak-account-freemarker (1.5.1.final), org.keycloak:keycloak-broker-oidc (1.5.1.final) +8 more potentially affected by CVE-2026-9087 via org.keycloak:keycloak-services (1.5.1.final)

org.keycloak:keycloak-services MAVEN version 1.5.1.final is affected by a known vulnerability. The following packages have a transitive dependency on org.keycloak:keycloak-services and may be impacted: - org.keycloak:keycloak-account-freemarker 1.5.1.final - org.keycloak:keycloak-broker-oidc...

org.keycloak:keycloak-account-freemarker (1.5.0.final), org.keycloak:keycloak-broker-oidc (1.5.0.final) +8 more potentially affected by CVE-2026-9087 via org.keycloak:keycloak-services (1.5.0.final)

org.keycloak:keycloak-services MAVEN version 1.5.0.final is affected by a known vulnerability. The following packages have a transitive dependency on org.keycloak:keycloak-services and may be impacted: - org.keycloak:keycloak-account-freemarker 1.5.0.final - org.keycloak:keycloak-broker-oidc...

org.keycloak:keycloak-account-freemarker (1.0-alpha-2), org.keycloak:keycloak-login-freemarker (1.0-alpha-2) +1 more potentially affected by CVE-2026-9087 via org.keycloak:keycloak-services (1.0-alpha-2)

org.keycloak:keycloak-services MAVEN version 1.0-alpha-2 is affected by a known vulnerability. The following packages have a transitive dependency on org.keycloak:keycloak-services and may be impacted: - org.keycloak:keycloak-account-freemarker 1.0-alpha-2 - org.keycloak:keycloak-login-freemarker...

org.keycloak:keycloak-authz-policy-drools (2.0.0.cr1), org.keycloak:keycloak-dependencies-server-all (2.0.0.cr1) +3 more potentially affected by CVE-2026-9087 via org.keycloak:keycloak-services (2.0.0.cr1)

org.keycloak:keycloak-services MAVEN version 2.0.0.cr1 is affected by a known vulnerability. The following packages have a transitive dependency on org.keycloak:keycloak-services and may be impacted: - org.keycloak:keycloak-authz-policy-drools 2.0.0.cr1 -...

org.keycloak:keycloak-authz-policy-drools (2.1.0.final), org.keycloak:keycloak-dependencies-server-all (2.1.0.final) +3 more potentially affected by CVE-2026-9087 via org.keycloak:keycloak-services (2.1.0.final)

org.keycloak:keycloak-services MAVEN version 2.1.0.final is affected by a known vulnerability. The following packages have a transitive dependency on org.keycloak:keycloak-services and may be impacted: - org.keycloak:keycloak-authz-policy-drools 2.1.0.final -...

org.keycloak:keycloak-authz-policy-drools (2.2.0.cr1), org.keycloak:keycloak-dependencies-server-all (2.2.0.cr1) +4 more potentially affected by CVE-2026-9087 via org.keycloak:keycloak-services (2.2.0.cr1)

org.keycloak:keycloak-services MAVEN version 2.2.0.cr1 is affected by a known vulnerability. The following packages have a transitive dependency on org.keycloak:keycloak-services and may be impacted: - org.keycloak:keycloak-authz-policy-drools 2.2.0.cr1 -...

org.keycloak:keycloak-authz-policy-drools (2.4.0.cr1), org.keycloak:keycloak-dependencies-server-all (2.4.0.cr1) +5 more potentially affected by CVE-2026-9087 via org.keycloak:keycloak-services (2.4.0.cr1)

org.keycloak:keycloak-services MAVEN version 2.4.0.cr1 is affected by a known vulnerability. The following packages have a transitive dependency on org.keycloak:keycloak-services and may be impacted: - org.keycloak:keycloak-authz-policy-drools 2.4.0.cr1 -...

org.keycloak:keycloak-authz-policy-drools (2.4.0.final), org.keycloak:keycloak-dependencies-server-all (2.4.0.final) +5 more potentially affected by CVE-2026-9087 via org.keycloak:keycloak-services (2.4.0.final)

org.keycloak:keycloak-services MAVEN version 2.4.0.final is affected by a known vulnerability. The following packages have a transitive dependency on org.keycloak:keycloak-services and may be impacted: - org.keycloak:keycloak-authz-policy-drools 2.4.0.final -...

org.keycloak:keycloak-authz-policy-drools (2.5.0.final), org.keycloak:keycloak-dependencies-server-all (2.5.0.final) +5 more potentially affected by CVE-2026-9087 via org.keycloak:keycloak-services (2.5.0.final)

org.keycloak:keycloak-services MAVEN version 2.5.0.final is affected by a known vulnerability. The following packages have a transitive dependency on org.keycloak:keycloak-services and may be impacted: - org.keycloak:keycloak-authz-policy-drools 2.5.0.final -...

org.keycloak:keycloak-authz-policy-drools (2.5.1.final), org.keycloak:keycloak-dependencies-server-all (2.5.1.final) +5 more potentially affected by CVE-2026-9087 via org.keycloak:keycloak-services (2.5.1.final)

org.keycloak:keycloak-services MAVEN version 2.5.1.final is affected by a known vulnerability. The following packages have a transitive dependency on org.keycloak:keycloak-services and may be impacted: - org.keycloak:keycloak-authz-policy-drools 2.5.1.final -...

de.adorsys.multibanking:keycloak-custom-secret-provider (>=1.3.0, <=1.20), org.keycloak:keycloak-authz-policy-drools (3.1.0.final) +5 more potentially affected by CVE-2026-9087 via org.keycloak:keycloak-services (3.1.0.final)

org.keycloak:keycloak-services MAVEN version 3.1.0.final is affected by a known vulnerability. The following packages have a transitive dependency on org.keycloak:keycloak-services and may be impacted: - de.adorsys.multibanking:keycloak-custom-secret-provider =1.3.0, =1.20 -...

org.keycloak:keycloak-authz-policy-drools (3.2.0.cr1), org.keycloak:keycloak-dependencies-server-all (3.2.0.cr1) +6 more potentially affected by CVE-2026-9087 via org.keycloak:keycloak-services (3.2.0.cr1)

org.keycloak:keycloak-services MAVEN version 3.2.0.cr1 is affected by a known vulnerability. The following packages have a transitive dependency on org.keycloak:keycloak-services and may be impacted: - org.keycloak:keycloak-authz-policy-drools 3.2.0.cr1 -...

org.keycloak:keycloak-authz-policy-drools (3.2.0.final), org.keycloak:keycloak-dependencies-server-all (3.2.0.final) +6 more potentially affected by CVE-2026-9087 via org.keycloak:keycloak-services (3.2.0.final)

org.keycloak:keycloak-services MAVEN version 3.2.0.final is affected by a known vulnerability. The following packages have a transitive dependency on org.keycloak:keycloak-services and may be impacted: - org.keycloak:keycloak-authz-policy-drools 3.2.0.final -...