diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0aea8fb541..c51baf5b1e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,12 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Nothing should go in this section, please add to the latest unreleased version
   (and update the corresponding date), or add a new version.
 
+## [1.18.4] - 2022-09-11
+
+### Added
+- Adds support for authorization token in header in OIDC authenticator.
+  [cyberark/conjur#2637](https://github.com/cyberark/conjur/pull/2637)
+
 ## [1.18.3] - 2022-09-07
 
 ### Security
diff --git a/app/domain/authentication/authn_oidc/update_input_with_username_from_id_token.rb b/app/domain/authentication/authn_oidc/update_input_with_username_from_id_token.rb
index aeffc47680..c5cc648845 100644
--- a/app/domain/authentication/authn_oidc/update_input_with_username_from_id_token.rb
+++ b/app/domain/authentication/authn_oidc/update_input_with_username_from_id_token.rb
@@ -11,14 +11,14 @@ module AuthnOidc
       inputs: %i[authenticator_input]
     ) do
       extend(Forwardable)
+      # The 'request' field in the 'authenticator_input' object will be used to extract the id token from the request header
       def_delegators(:@authenticator_input, :service_id, :authenticator_name,
-                     :account, :username, :webservice, :credentials, :client_ip,
+                     :account, :username, :webservice, :credentials, :client_ip, :request,
                      :role)
 
       def call
         validate_account_exists
         validate_service_id_exists
-        validate_credentials_include_id_token
         verify_and_decode_token
         validate_conjur_username
         input_with_username
@@ -36,15 +36,6 @@ def validate_service_id_exists
         raise Errors::Authentication::AuthnOidc::ServiceIdMissing unless service_id
       end
 
-      def validate_credentials_include_id_token
-        id_token_field_name = "id_token"
-
-        # check that id token field exists and has some value
-        if decoded_credentials.fetch(id_token_field_name, "") == ""
-          raise Errors::Authentication::RequestBody::MissingRequestParam, id_token_field_name
-        end
-      end
-
       def verify_and_decode_token
         @decoded_token = @verify_and_decode_token.(
           provider_uri: oidc_authenticator_secrets["provider-uri"],
@@ -53,9 +44,45 @@ def verify_and_decode_token
         )
       end
 
-      # The credentials are in a URL encoded form data in the request body
+      # The credentials are in a URL encoded form data in the request body or in the request header
       def decoded_credentials
-        @decoded_credentials ||= Hash[URI.decode_www_form(credentials)]
+        @decoded_credentials ||= begin
+          return token_from_body if token_from_body
+
+          return token_from_header if token_from_header
+
+          # If the token is not in the header or body, raise a missing param exception
+          raise Errors::Authentication::RequestBody::MissingRequestParam, 'id_token'
+        end
+      end
+
+      def token_from_header
+        @token_from_header ||= begin
+          return nil unless request&.headers&.key?("HTTP_AUTHORIZATION")
+
+          # Extract the token from the authorization header
+          id_token = request.headers['HTTP_AUTHORIZATION'].split(' ', -1)
+
+          # Verify the token is given as a bearer token
+          return nil unless id_token[0] == "Bearer" && id_token.length == 2
+
+          # Return the token formatted as it would be if extracted from the body
+          # as `application/x-www-form-urlencoded` data.
+          {
+            # URL decode the ID token from the header
+            "id_token" => URI.decode_www_form_component(id_token[1])
+          }
+        end
+      end
+
+      def token_from_body
+        @token_from_body ||= begin
+          # Parse the request body
+          credential_token = Hash[URI.decode_www_form(credentials)]
+
+          # Return the parsed body if it include the token
+          credential_token unless credential_token.fetch('id_token', "").empty?
+        end
       end
 
       def oidc_authenticator_secrets
diff --git a/cucumber/authenticators_oidc/features/authn_oidc.feature b/cucumber/authenticators_oidc/features/authn_oidc.feature
index a270abf14b..d603ebc7fc 100644
--- a/cucumber/authenticators_oidc/features/authn_oidc.feature
+++ b/cucumber/authenticators_oidc/features/authn_oidc.feature
@@ -39,7 +39,23 @@ Feature: OIDC Authenticator - Hosts can authenticate with OIDC authenticator
     And I successfully set OIDC variables
 
   @smoke
-  Scenario: A valid id token to get Conjur access token
+  Scenario: A valid id token in header to get Conjur access token
+    # We want to verify the returned access token is valid for retrieving a secret
+    Given I have a "variable" resource called "test-variable"
+    And I permit user "alice" to "execute" it
+    And I add the secret value "test-secret" to the resource "cucumber:variable:test-variable"
+    And I fetch an ID Token for username "alice" and password "alice"
+    And I save my place in the audit log file
+    When I authenticate via OIDC with id token in header
+    Then user "alice" has been authorized by Conjur
+    And I successfully GET "/secrets/cucumber/variable/test-variable" with authorized user
+    And The following appears in the audit log after my savepoint:
+    """
+    cucumber:user:alice successfully authenticated with authenticator authn-oidc service cucumber:webservice:conjur/authn-oidc/keycloak
+    """
+
+  @smoke
+  Scenario: A valid id token in body to get Conjur access token
     # We want to verify the returned access token is valid for retrieving a secret
     Given I have a "variable" resource called "test-variable"
     And I permit user "alice" to "execute" it
diff --git a/cucumber/authenticators_oidc/features/step_definitions/authn_oidc_steps.rb b/cucumber/authenticators_oidc/features/step_definitions/authn_oidc_steps.rb
index 69e35b0eb6..00b54b3697 100644
--- a/cucumber/authenticators_oidc/features/step_definitions/authn_oidc_steps.rb
+++ b/cucumber/authenticators_oidc/features/step_definitions/authn_oidc_steps.rb
@@ -161,6 +161,13 @@
   )
 end
 
+When(/^I authenticate via OIDC with id token in header$/) do
+  authenticate_id_token_with_oidc_in_header(
+    service_id: AuthnOidcHelper::SERVICE_ID,
+    account: AuthnOidcHelper::ACCOUNT
+  )
+end
+
 Given(/^I successfully set OIDC V2 variables for "([^"]*)"$/) do |service_id|
   create_oidc_secret("provider-uri", oidc_provider_uri, service_id)
   create_oidc_secret("response-type", oidc_response_type, service_id)
diff --git a/cucumber/authenticators_oidc/features/support/authn_oidc_helper.rb b/cucumber/authenticators_oidc/features/support/authn_oidc_helper.rb
index 42c1e744d3..fab2bb92d4 100644
--- a/cucumber/authenticators_oidc/features/support/authn_oidc_helper.rb
+++ b/cucumber/authenticators_oidc/features/support/authn_oidc_helper.rb
@@ -24,6 +24,14 @@ def authenticate_id_token_with_oidc(service_id:, account:, id_token: parsed_id_t
     post(path, payload)
   end
 
+  def authenticate_id_token_with_oidc_in_header(service_id:, account:, id_token: parsed_id_token)
+    service_id_part = service_id ? "/#{service_id}" : ""
+    path = "#{conjur_hostname}/authn-oidc#{service_id_part}/#{account}/authenticate"
+    headers = {}
+    headers["Authorization"] = "Bearer #{id_token}"
+    post(path, {}, headers)
+  end
+
   def authenticate_code_with_oidc(service_id:, account:, code: url_oidc_code, state: url_oidc_state)
     path = "#{create_auth_url(service_id: service_id, account: account, user_id: nil)}"
     get(url_with_params(path: path,code: code, state: state ))
diff --git a/spec/app/domain/authentication/authn-oidc/update_input_with_username_from_id_token_spec.rb b/spec/app/domain/authentication/authn-oidc/update_input_with_username_from_id_token_spec.rb
index 63271e6963..5771599528 100644
--- a/spec/app/domain/authentication/authn-oidc/update_input_with_username_from_id_token_spec.rb
+++ b/spec/app/domain/authentication/authn-oidc/update_input_with_username_from_id_token_spec.rb
@@ -27,13 +27,14 @@
   # request mock
   ####################################
 
-  def mock_authenticate_oidc_request(request_body_data:)
+  def mock_authenticate_oidc_request(request_body_data: , request_headers:)
     double('AuthnOidcRequest').tap do |request|
       request_body = StringIO.new
       request_body.puts(request_body_data)
       request_body.rewind
 
       allow(request).to receive(:body).and_return(request_body)
+      allow(request).to receive(:headers).and_return(request_headers)
     end
   end
 
@@ -42,23 +43,43 @@ def request_body(request)
   end
 
   let(:authenticate_id_token_request) do
-    mock_authenticate_oidc_request(request_body_data: "id_token={\"id_token_username_field\": \"alice\"}")
+    mock_authenticate_oidc_request(request_body_data: "id_token={\"id_token_username_field\": \"alice\"}", request_headers: nil)
   end
 
   let(:authenticate_id_token_request_missing_id_token_username_field) do
-    mock_authenticate_oidc_request(request_body_data: "id_token={}")
+    mock_authenticate_oidc_request(request_body_data: "id_token={}", request_headers: nil)
   end
 
   let(:authenticate_id_token_request_empty_id_token_username_field) do
-    mock_authenticate_oidc_request(request_body_data: "id_token={\"id_token_username_field\": \"\"}")
+    mock_authenticate_oidc_request(request_body_data: "id_token={\"id_token_username_field\": \"\"}", request_headers: nil)
   end
 
   let(:authenticate_id_token_request_missing_id_token_field) do
-    mock_authenticate_oidc_request(request_body_data: "some_key=some_value")
+    mock_authenticate_oidc_request(request_body_data: "some_key=some_value", request_headers: nil)
   end
 
   let(:authenticate_id_token_request_empty_id_token_field) do
-    mock_authenticate_oidc_request(request_body_data: "id_token=")
+    mock_authenticate_oidc_request(request_body_data: "id_token=", request_headers: nil)
+  end
+
+  let(:authenticate_id_token_request_id_token_in_header_field) do
+    mock_authenticate_oidc_request(request_body_data: "id_token=", request_headers: {"HTTP_AUTHORIZATION" => "Bearer {\"id_token_username_field\":\"alice\"}"})
+  end
+
+  let(:authenticate_id_token_request_invalid_id_token_in_header_field) do
+    mock_authenticate_oidc_request(request_body_data: "id_token=", request_headers: {"HTTP_AUTHORIZATION" => "{\"id_token_username_field\":\"alice\"}"})
+  end
+
+  let(:authenticate_id_token_request_empty_id_token_in_header_field) do
+    mock_authenticate_oidc_request(request_body_data: "id_token=", request_headers: {"HTTP_AUTHORIZATION" => ""})
+  end
+
+  let(:authenticate_id_token_request_missing_id_token_in_body_field) do
+    mock_authenticate_oidc_request(request_body_data: "", request_headers: {"HTTP_AUTHORIZATION" => "Bearer {\"id_token_username_field\":\"alice\"}"})
+  end
+
+  let(:authenticate_id_token_request_contain_only_bearer_in_header_field) do
+    mock_authenticate_oidc_request(request_body_data: "", request_headers: {"HTTP_AUTHORIZATION" => "Bearer"})
   end
 
   #  ____  _   _  ____    ____  ____  ___  ____  ___
@@ -247,6 +268,141 @@ def request_body(request)
           expect { subject }.to raise_error(::Errors::Authentication::RequestBody::MissingRequestParam)
         end
       end
+
+      context "with valid id token in header" do
+        let(:audit_success) { false }
+
+        subject do
+          input_ = Authentication::AuthenticatorInput.new(
+            authenticator_name: 'authn-oidc',
+            service_id: 'my-service',
+            account: 'my-acct',
+            username: nil,
+            credentials: request_body(authenticate_id_token_request_id_token_in_header_field),
+            client_ip: '127.0.0.1',
+            request: authenticate_id_token_request_id_token_in_header_field
+          )
+
+          ::Authentication::AuthnOidc::UpdateInputWithUsernameFromIdToken.new(
+            verify_and_decode_token: mocked_decode_and_verify_id_token,
+            validate_account_exists: mock_validate_account_exists(validation_succeeded: true)
+          ).call(
+            authenticator_input: input_
+          )
+        end
+
+        it "returns the input with the username inside it" do
+          expect(subject.username).to eql("alice")
+        end
+      end
+
+      context "with invalid id token in header and in body" do
+        let(:audit_success) { false }
+
+        subject do
+          input_ = Authentication::AuthenticatorInput.new(
+            authenticator_name: 'authn-oidc',
+            service_id: 'my-service',
+            account: 'my-acct',
+            username: nil,
+            credentials: request_body(authenticate_id_token_request_invalid_id_token_in_header_field),
+            client_ip: '127.0.0.1',
+            request: authenticate_id_token_request_invalid_id_token_in_header_field
+          )
+
+          ::Authentication::AuthnOidc::UpdateInputWithUsernameFromIdToken.new(
+            verify_and_decode_token: mocked_decode_and_verify_id_token,
+            validate_account_exists: mock_validate_account_exists(validation_succeeded: true)
+          ).call(
+            authenticator_input: input_
+          )
+        end
+
+        it "raises a MissingRequestParam error" do
+          expect { subject }.to raise_error(::Errors::Authentication::RequestBody::MissingRequestParam)
+        end
+      end
+
+      context "with empty id token in header and invalid in body" do
+        let(:audit_success) { false }
+
+        subject do
+          input_ = Authentication::AuthenticatorInput.new(
+            authenticator_name: 'authn-oidc',
+            service_id: 'my-service',
+            account: 'my-acct',
+            username: nil,
+            credentials: request_body(authenticate_id_token_request_empty_id_token_in_header_field),
+            client_ip: '127.0.0.1',
+            request: authenticate_id_token_request_empty_id_token_in_header_field
+          )
+
+          ::Authentication::AuthnOidc::UpdateInputWithUsernameFromIdToken.new(
+            verify_and_decode_token: mocked_decode_and_verify_id_token,
+            validate_account_exists: mock_validate_account_exists(validation_succeeded: true)
+          ).call(
+            authenticator_input: input_
+          )
+        end
+
+        it "raises a MissingRequestParam error" do
+          expect { subject }.to raise_error(::Errors::Authentication::RequestBody::MissingRequestParam)
+        end
+      end
+
+      context "with valid id token in header and empty body" do
+        let(:audit_success) { false }
+
+        subject do
+          input_ = Authentication::AuthenticatorInput.new(
+            authenticator_name: 'authn-oidc',
+            service_id: 'my-service',
+            account: 'my-acct',
+            username: nil,
+            credentials: request_body(authenticate_id_token_request_missing_id_token_in_body_field),
+            client_ip: '127.0.0.1',
+            request: authenticate_id_token_request_missing_id_token_in_body_field
+          )
+
+          ::Authentication::AuthnOidc::UpdateInputWithUsernameFromIdToken.new(
+            verify_and_decode_token: mocked_decode_and_verify_id_token,
+            validate_account_exists: mock_validate_account_exists(validation_succeeded: true)
+          ).call(
+            authenticator_input: input_
+          )
+        end
+
+        it "returns the input with the username inside it" do
+          expect(subject.username).to eql("alice")
+        end
+      end
+
+      context "with bearer only in id token in header and empty body" do
+        let(:audit_success) { false }
+
+        subject do
+          input_ = Authentication::AuthenticatorInput.new(
+            authenticator_name: 'authn-oidc',
+            service_id: 'my-service',
+            account: 'my-acct',
+            username: nil,
+            credentials: request_body(authenticate_id_token_request_contain_only_bearer_in_header_field),
+            client_ip: '127.0.0.1',
+            request: authenticate_id_token_request_contain_only_bearer_in_header_field
+          )
+
+          ::Authentication::AuthnOidc::UpdateInputWithUsernameFromIdToken.new(
+            verify_and_decode_token: mocked_decode_and_verify_id_token,
+            validate_account_exists: mock_validate_account_exists(validation_succeeded: true)
+          ).call(
+            authenticator_input: input_
+          )
+        end
+
+        it "raises a MissingRequestParam error" do
+          expect { subject }.to raise_error(::Errors::Authentication::RequestBody::MissingRequestParam)
+        end
+      end  
     end
   end
 end