diff --git a/templates/acs-oidc-client-secret-external-secret.yaml b/templates/acs-oidc-client-secret-external-secret.yaml
new file mode 100644
index 0000000..77f244c
--- /dev/null
+++ b/templates/acs-oidc-client-secret-external-secret.yaml
@@ -0,0 +1,24 @@
+{{- if .Values.keycloak.defaultConfig }}
+---
+apiVersion: "external-secrets.io/v1beta1"
+kind: ExternalSecret
+metadata:
+  name: acs-oidc-client-secret
+  namespace: {{ .Release.Namespace }}
+spec:
+  refreshInterval: 15s
+  secretStoreRef:
+    name: {{ .Values.global.secretStore.name }}
+    kind: {{ .Values.global.secretStore.kind }}
+  target:
+    name: acs-oidc-client-secret
+    template:
+      type: Opaque
+      data:
+        client-secret: "{{ `{{ .client_secret }}` }}"
+  data:
+  - secretKey: client_secret
+    remoteRef:
+      key: {{ .Values.keycloak.oidcSecrets.acsClient.vaultPath }}
+      property: admin-password
+{{- end }}
diff --git a/templates/keycloak-realm-import.yaml b/templates/keycloak-realm-import.yaml
index 0ebf52c..56b9993 100644
--- a/templates/keycloak-realm-import.yaml
+++ b/templates/keycloak-realm-import.yaml
@@ -7,18 +7,50 @@ Merge realms
 {{- $realms = append $realms .Values.keycloak.defaultRealm }}
 {{- end }}
 {{- range $realms }}
+{{- $realm := deepCopy . }}
+{{- $localDomain := $.Values.global.localClusterDomain }}
+{{- $oidcProviderBase := printf "https://spire-spiffe-oidc-discovery-provider.%s" $localDomain }}
+{{- if $.Values.keycloak.spiffeIdentityProvider.enabled }}
+{{- $spiffeConfig := deepCopy $.Values.keycloak.spiffeIdentityProvider.config }}
+{{- $defaultJwksUrl := printf "%s/keys" $oidcProviderBase }}
+{{- if or (not (hasKey $spiffeConfig.config "issuer")) (eq (index $spiffeConfig.config "issuer") "") }}
+{{- $_ := set $spiffeConfig.config "issuer" $oidcProviderBase }}
+{{- end }}
+{{- if or (not (hasKey $spiffeConfig.config "jwksUrl")) (eq (index $spiffeConfig.config "jwksUrl") "") }}
+{{- $_ := set $spiffeConfig.config "jwksUrl" $defaultJwksUrl }}
+{{- end }}
+{{- if or (not (hasKey $spiffeConfig.config "authorizationUrl")) (eq (index $spiffeConfig.config "authorizationUrl") "") }}
+{{- $_ := set $spiffeConfig.config "authorizationUrl" (printf "%s/authorize" $oidcProviderBase) }}
+{{- end }}
+{{- if or (not (hasKey $spiffeConfig.config "tokenUrl")) (eq (index $spiffeConfig.config "tokenUrl") "") }}
+{{- $_ := set $spiffeConfig.config "tokenUrl" (printf "%s/token" $oidcProviderBase) }}
+{{- end }}
+{{- $existingIdps := default list $realm.identityProviders }}
+{{- $_ := set $realm "identityProviders" (append $existingIdps $spiffeConfig) }}
+{{- end }}
+{{/* Auto-populate jwt.credential.sub for federated-jwt clients */}}
+{{- range $realm.clients }}
+{{- if eq (default "" .clientAuthenticatorType) "federated-jwt" }}
+{{- $attrs := default dict .attributes }}
+{{- if or (not (hasKey $attrs "jwt.credential.sub")) (eq (index $attrs "jwt.credential.sub") "") }}
+{{- $clientName := default .clientId .name }}
+{{- $_ := set $attrs "jwt.credential.sub" (printf "spiffe://%s/ns/%s/sa/%s" $localDomain $clientName $clientName) }}
+{{- end }}
+{{- $_ := set . "attributes" $attrs }}
+{{- end }}
+{{- end }}
 ---
 apiVersion: k8s.keycloak.org/v2alpha1
 kind: KeycloakRealmImport
 metadata:
-  name: "{{ .realm }}-realm-import"
+  name: "{{ $realm.realm }}-realm-import"
   namespace: "{{ $.Release.Namespace }}"
   annotations:
     argocd.argoproj.io/sync-wave: "10"
 spec:
   keycloakCRName: keycloak
   realm:
-{{- toYaml . | nindent 4 }}
+{{- toYaml $realm | nindent 4 }}
   placeholders:
     QTODO_ADMIN_PASSWORD:
       secret:
@@ -36,13 +68,23 @@ spec:
       secret:
         name: {{ $.Values.keycloak.users.secretName }}
         key: rhtpa-user-password
+{{- if and $.Values.keycloak.oidcSecrets.qtodo (default false $.Values.keycloak.oidcSecrets.qtodo.enabled) }}
     QTODO_CLIENT_SECRET:
       secret:
         name: oidc-client-secret
         key: client-secret
+{{- end }}
     RHTPA_CLI_SECRET:
       secret:
         name: rhtpa-oidc-cli-secret
         key: client-secret
+    ACS_ADMIN_PASSWORD:
+      secret:
+        name: {{ $.Values.keycloak.users.secretName }}
+        key: acs-admin-password
+    ACS_CLIENT_SECRET:
+      secret:
+        name: acs-oidc-client-secret
+        key: client-secret
+{{- end }}
 {{- end }}
-{{- end }}
\ No newline at end of file
diff --git a/templates/keycloak-users-external-secret.yaml b/templates/keycloak-users-external-secret.yaml
index ee2bf91..ecf8ec0 100644
--- a/templates/keycloak-users-external-secret.yaml
+++ b/templates/keycloak-users-external-secret.yaml
@@ -18,6 +18,7 @@ spec:
         qtodo-user1-password: "{{ `{{ .qtodo_user1_password }}` }}"
         rhtas-user-password: "{{ `{{ .rhtas_user_password }}` }}"
         rhtpa-user-password: "{{ `{{ .rhtpa_user_password }}` }}"
+        acs-admin-password: "{{ `{{ .acs_admin_password }}` }}"
   data:
   - secretKey: qtodo_admin_password
     remoteRef:
@@ -35,4 +36,8 @@ spec:
     remoteRef:
       key: {{ .Values.keycloak.users.passwordVaultKey }}
       property: rhtpa-user-password
+  - secretKey: acs_admin_password
+    remoteRef:
+      key: secret/data/hub/infra/acs/acs-central
+      property: admin-password
 {{- end }}
diff --git a/templates/keycloak.yaml b/templates/keycloak.yaml
index a2fd854..c12da17 100644
--- a/templates/keycloak.yaml
+++ b/templates/keycloak.yaml
@@ -6,6 +6,12 @@ metadata:
   annotations:
     argocd.argoproj.io/sync-wave: "5"
 spec:
+{{- if .Values.keycloak.spiffeIdentityProvider.enabled }}
+  features:
+    enabled:
+      - spiffe
+      - client-auth-federated
+{{- end }}
 {{- if eq .Values.keycloak.adminUser.enabled true }}
   bootstrapAdmin:
     user:
diff --git a/templates/oidc-client-secret-external-secret.yaml b/templates/oidc-client-secret-external-secret.yaml
index 5f5a5ad..0ba01a6 100644
--- a/templates/oidc-client-secret-external-secret.yaml
+++ b/templates/oidc-client-secret-external-secret.yaml
@@ -1,4 +1,4 @@
-{{- if .Values.keycloak.defaultConfig }}
+{{- if and .Values.keycloak.defaultConfig (default false .Values.keycloak.oidcSecrets.qtodo.enabled) }}
 apiVersion: "external-secrets.io/v1beta1"
 kind: ExternalSecret
 metadata:
diff --git a/values.yaml b/values.yaml
index cd2da27..5c7f30c 100644
--- a/values.yaml
+++ b/values.yaml
@@ -18,12 +18,28 @@ keycloak:
         name: qtodo
         protocol: openid-connect
         publicClient: false
+        clientAuthenticatorType: federated-jwt
+        serviceAccountsEnabled: true
         redirectUris:
           - "*"
-        secret: ${QTODO_CLIENT_SECRET}
         standardFlowEnabled: true
+        directAccessGrantsEnabled: false
         webOrigins:
           - +
+        fullScopeAllowed: true
+        attributes:
+          jwt.credential.issuer: spiffe
+          # Auto-generated by template: spiffe://<localClusterDomain>/ns/qtodo/sa/qtodo
+          jwt.credential.sub: ""
+          post.logout.redirect.uris: "+"
+        defaultClientScopes:
+          - web-origins
+          - roles
+          - profile
+          - basic
+          - email
+        optionalClientScopes:
+          - offline_access
       - clientId: trusted-artifact-signer
         enabled: true
         name: Red Hat Trusted Artifact Signer Client
@@ -59,6 +75,54 @@ keycloak:
               access.token.claim: "true"
               id.token.claim: "true"
               userinfo.token.claim: "false"
+      # ACS Central OIDC Client
+      - clientId: acs-central
+        enabled: true
+        name: Red Hat Advanced Cluster Security Central
+        protocol: openid-connect
+        publicClient: false
+        secret: ${ACS_CLIENT_SECRET}
+        redirectUris:
+          - "*"
+        directAccessGrantsEnabled: true
+        standardFlowEnabled: true
+        implicitFlowEnabled: false
+        webOrigins:
+          - "*"
+        fullScopeAllowed: true
+        defaultClientScopes:
+          - openid
+          - basic
+          - email
+          - profile
+          - roles
+          - web-origins
+        optionalClientScopes:
+          - address
+          - phone
+          - offline_access
+        protocolMappers:
+          - name: groups
+            protocol: openid-connect
+            protocolMapper: oidc-group-membership-mapper
+            consentRequired: false
+            config:
+              full.path: "false"
+              id.token.claim: "true"
+              access.token.claim: "true"
+              claim.name: groups
+              userinfo.token.claim: "true"
+          - name: roles
+            protocol: openid-connect
+            protocolMapper: oidc-usermodel-realm-role-mapper
+            consentRequired: false
+            config:
+              multivalued: "true"
+              userinfo.token.claim: "true"
+              id.token.claim: "true"
+              access.token.claim: "true"
+              claim.name: roles
+              jsonType.label: String
       # RHTPA CLI Client - matches Trustify 'cli' client configuration
       # Reference: https://github.com/guacsec/trustify-helm-charts/blob/main/charts/trustify-infrastructure/templates/keycloak/010-ConfigMap.yaml
       - clientId: rhtpa-cli
@@ -132,6 +196,22 @@ keycloak:
     # Note: We must define 'basic' scope with 'sub' mapper for OIDC compliance
     # The 'sub' claim is required by RHTPA for user identification
     clientScopes:
+      # OpenID scope - mandatory OIDC scope (required by ACS and other OIDC clients)
+      - name: openid
+        description: OpenID Connect built-in scope
+        protocol: openid-connect
+        attributes:
+          include.in.token.scope: "true"
+          display.on.consent.screen: "false"
+        protocolMappers:
+          - name: sub
+            protocol: openid-connect
+            protocolMapper: oidc-sub-mapper
+            consentRequired: false
+            config:
+              introspection.token.claim: "true"
+              access.token.claim: "true"
+              id.token.claim: "true"
       # Basic scope - required for 'sub' claim in tokens
       # Standard OIDC scopes required by Trustify/RHTPA
       # Reference: https://github.com/mrrajan/trustify/blob/doc_rhbk_operator/docs/book/modules/admin/pages/infrastructure.adoc
@@ -268,6 +348,7 @@ keycloak:
           display.on.consent.screen: "false"
     # Set default client scopes for the realm (applied to all new clients)
     defaultDefaultClientScopes:
+      - openid
       - basic
       - email
       - profile
@@ -283,6 +364,8 @@ keycloak:
           name: create:sbom
         - description: RHTPA Document Creator
           name: create:document
+        - description: ACS Administrator
+          name: acs-admin
     users:
       - createdTimestamp: 1
         credentials:
@@ -342,6 +425,20 @@ keycloak:
           - create:sbom
           - create:document
         username: rhtpa-user
+      - createdTimestamp: 1
+        credentials:
+          - temporary: false
+            type: password
+            value: ${ACS_ADMIN_PASSWORD}
+        email: admin@example.com
+        emailVerified: true
+        enabled: true
+        firstName: ACS
+        lastName: Administrator
+        realmRoles:
+          - acs-admin
+          - offline_access
+        username: admin
   ingress:
     enabled: true
     service: keycloak-service-trusted
@@ -364,9 +461,48 @@ keycloak:
     secretName: keycloak-users
   # OIDC client secrets for realm configuration
   oidcSecrets:
-    # QTodo OIDC client secret (app-level)
+    # QTodo OIDC client secret — disabled when using federated-jwt (client assertion)
     qtodo:
+      enabled: false
       vaultPath: secret/data/apps/qtodo/qtodo-oidc-client
     # RHTPA CLI OIDC client secret (infra)
     rhtpaCli:
       vaultPath: secret/data/hub/infra/rhtpa/rhtpa-oidc-cli
+    # ACS Central OIDC client secret (infra)
+    acsClient:
+      vaultPath: secret/data/hub/infra/acs/acs-central
+  # SPIFFE Identity Provider for Federated Client Authentication
+  # Requires RHBK 26.4+ with Technology Preview features: spiffe + client-auth-federated
+  # (automatically enabled in keycloak.yaml when this is enabled)
+  #
+  # Uses an OIDC provider type (not Keycloak's native SPIFFE provider) because the
+  # ZTWIM operator forces SpireServer.jwtIssuer to be an HTTPS URL, so JWT SVIDs
+  # contain iss: "https://spire-spiffe-oidc-discovery-provider.<domain>".
+  # Keycloak's native SPIFFE IdP rejects this (expects spiffe:// URI).
+  # The OIDC provider matches the HTTPS issuer, enabling Keycloak's federated-jwt
+  # client authenticator to resolve clients by iss+sub without requiring client_id.
+  #
+  # Reference: https://www.keycloak.org/2026/01/federated-client-authentication
+  spiffeIdentityProvider:
+    enabled: true
+    config:
+      alias: spiffe
+      displayName: SPIFFE Workload Identity
+      providerId: oidc
+      enabled: true
+      hideOnLogin: true
+      config:
+        # SPIRE OIDC Discovery Provider issuer URL (auto-generated if empty)
+        issuer: ""
+        # Required by Keycloak OIDC IdP but unused for federated client auth
+        authorizationUrl: ""
+        tokenUrl: ""
+        # SPIRE OIDC Discovery Provider JWKS URL (auto-generated if empty)
+        jwksUrl: ""
+        clientId: keycloak
+        clientSecret: unused
+        useJwksUrl: "true"
+        validateSignature: "true"
+        supportsClientAssertions: "true"
+        supportsClientAssertionReuse: "true"
+        syncMode: LEGACY