diff --git a/app/lib/error/calnet_error.rb b/app/lib/error/calnet_error.rb
new file mode 100644
index 00000000..4aacc0df
--- /dev/null
+++ b/app/lib/error/calnet_error.rb
@@ -0,0 +1,5 @@
+module Error
+  # Raised calnet error when it returns an unexpected response, such as missing expected attributes
+  class CalnetError < ApplicationError
+  end
+end
diff --git a/app/models/concerns/calnet_authentication.rb b/app/models/concerns/calnet_authentication.rb
new file mode 100644
index 00000000..dcf1f498
--- /dev/null
+++ b/app/models/concerns/calnet_authentication.rb
@@ -0,0 +1,131 @@
+# Handles CalNet authentication and attribute validation for User
+module CalnetAuthentication
+  FRAMEWORK_ADMIN_GROUP = 'cn=edu:berkeley:org:libr:framework:LIBR-framework-admins,ou=campus groups,dc=berkeley,dc=edu'.freeze
+  ALMA_ADMIN_GROUP = 'cn=edu:berkeley:org:libr:framework:alma-admins,ou=campus groups,dc=berkeley,dc=edu'.freeze
+
+  # CalNet attribute mapping derived from configuration
+  CALNET_ATTRS = Rails.application.config.calnet_attrs.freeze
+
+  def self.included(base)
+    base.extend(ClassMethods)
+  end
+
+  module ClassMethods
+    # Returns a new user object from the given "omniauth.auth" hash. That's a
+    # hash of all data returned by the auth provider (in our case, calnet).
+    #
+    # @see https://github.com/omniauth/omniauth/wiki/Auth-Hash-Schema OmniAuth Schema
+    # @see https://git.lib.berkeley.edu/lap/altmedia/issues/16#note_5549 Sample Calnet Response
+    # @see https://calnetweb.berkeley.edu/calnet-technologists/ldap-directory-service/how-ldap-organized/people-ou/people-attribute-schema CalNet LDAP
+    def from_omniauth(auth)
+      raise Error::InvalidAuthProviderError, auth['provider'] \
+        if auth['provider'].to_sym != :calnet
+
+      new(**auth_params_from(auth))
+    end
+
+    private
+
+    # rubocop:disable Metrics/AbcSize, Metrics/MethodLength
+    def auth_params_from(auth)
+      auth_extra = auth['extra']
+      verify_calnet_attributes!(auth_extra)
+      cal_groups = auth_extra['berkeleyEduIsMemberOf'] || []
+
+      # NOTE: berkeleyEduCSID should be same as berkeleyEduStuID for students
+      {
+        affiliations: get_attribute_from_auth(auth_extra, :affiliations),
+        cs_id: auth_extra['berkeleyEduCSID'], # Not included in CALNET_ATTRS because it's not used by any applications; Just keep it here.
+        department_number: get_attribute_from_auth(auth_extra, :department_number),
+        display_name: get_attribute_from_auth(auth_extra, :display_name),
+        email: get_attribute_from_auth(auth_extra, :email),
+        employee_id: get_attribute_from_auth(auth_extra, :employee_id),
+        given_name: get_attribute_from_auth(auth_extra, :given_name),
+        student_id: get_attribute_from_auth(auth_extra, :student_id),
+        surname: get_attribute_from_auth(auth_extra, :surname),
+        ucpath_id: get_attribute_from_auth(auth_extra, :ucpath_id),
+        uid: auth_extra['uid'] || auth['uid'],
+        framework_admin: cal_groups.include?(FRAMEWORK_ADMIN_GROUP),
+        alma_admin: cal_groups.include?(ALMA_ADMIN_GROUP)
+      }
+    end
+    # rubocop:enable Metrics/AbcSize, Metrics/MethodLength
+
+    # Verifies that auth_extra contains all required CalNet attributes with exact case-sensitive names
+    # For array attributes, at least one value in the array must be present in auth_extra
+    # Not all users have the same attributes, so the required attributes are determined based on the user's affiliations (e.g. employee vs student)
+    # Raise [Error::CalnetError] if any required attributes are missing
+    def verify_calnet_attributes!(auth_extra)
+      affiliations = affiliations_from(auth_extra)
+      raise_missing_calnet_attribute_error(auth_extra, ['berkeleyEduAffiliations']) if affiliations.blank?
+
+      required_attributes = required_attributes_for(affiliations)
+
+      missing = required_attributes.reject do |attr|
+        present_in_auth_extra?(auth_extra, attr)
+      end
+
+      return if missing.empty?
+
+      raise_missing_calnet_attribute_error(auth_extra, missing)
+    end
+
+    def raise_missing_calnet_attribute_error(auth_extra, missing)
+      missing_attrs = "Expected CalNet attribute(s) not found (case-sensitive): #{missing.join(', ')}."
+      actual_calnet_keys = auth_extra.keys.reject { |k| k.start_with?('duo') }.sort
+      msg = "#{missing_attrs} The actual CalNet attributes: #{actual_calnet_keys.join(', ')}. The user is #{auth_extra['displayName']}"
+      Rails.logger.error(msg)
+      raise Error::CalnetError, msg
+    end
+
+    def affiliations_from(auth_extra)
+      Array(auth_extra['berkeleyEduAffiliations'])
+    end
+
+    def employee_affiliated?(affiliations)
+      affiliations.include?('EMPLOYEE-TYPE-STAFF') ||
+        affiliations.include?('EMPLOYEE-TYPE-ACADEMIC')
+    end
+
+    def student_affiliated?(affiliations)
+      affiliations.include?('STUDENT-TYPE-NOT-REGISTERED') ||
+        affiliations.include?('STUDENT-TYPE-REGISTERED')
+    end
+
+    def required_attributes_for(affiliations)
+      required_cal_attrs = CALNET_ATTRS.dup
+      required_cal_attrs.delete(:affiliations)
+
+      # only employee afflication will validate employee_id and ucpath_id attributes.
+      unless employee_affiliated?(affiliations)
+        required_cal_attrs.delete(:employee_id)
+        required_cal_attrs.delete(:ucpath_id)
+      end
+
+      # only student registered and not-registered affiliation will validate student_id attribute.
+      required_cal_attrs.delete(:student_id) unless student_affiliated?(affiliations)
+
+      required_cal_attrs.values
+    end
+
+    def present_in_auth_extra?(auth_extra, attr)
+      if attr.is_a?(Array)
+        attr.any? { |a| auth_extra.key?(a) }
+      else
+        auth_extra.key?(attr)
+      end
+    end
+
+    # Gets an attribute value from auth_extra, handling both string and array attribute names as defined in CALNET_ATTRS.
+    # For array attribute names, it tries each name in order and returns the first match.
+    # This is to handle situations where the same attribute may have different attribute names
+    # (e.g. berkeleyEduAlternateID vs berkeleyEduAlternateId).
+    # If attribute is a string, returns the value for that key
+    def get_attribute_from_auth(auth_extra, attr_key)
+      attrs = CALNET_ATTRS[attr_key]
+      return auth_extra[attrs] unless attrs.is_a?(Array)
+
+      attrs.find { |attr| auth_extra.key?(attr) }.then { |attr| attr && auth_extra[attr] }
+    end
+  end
+end
diff --git a/app/models/user.rb b/app/models/user.rb
index f1943ccb..19e0100b 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -3,50 +3,7 @@
 # This is closely coupled to CalNet's user schema.
 class User
   include ActiveModel::Model
-
-  FRAMEWORK_ADMIN_GROUP = 'cn=edu:berkeley:org:libr:framework:LIBR-framework-admins,ou=campus groups,dc=berkeley,dc=edu'.freeze
-  ALMA_ADMIN_GROUP = 'cn=edu:berkeley:org:libr:framework:alma-admins,ou=campus groups,dc=berkeley,dc=edu'.freeze
-
-  class << self
-    # Returns a new user object from the given "omniauth.auth" hash. That's a
-    # hash of all data returned by the auth provider (in our case, calnet).
-    #
-    # @see https://github.com/omniauth/omniauth/wiki/Auth-Hash-Schema OmniAuth Schema
-    # @see https://git.lib.berkeley.edu/lap/altmedia/issues/16#note_5549 Sample Calnet Response
-    # @see https://calnetweb.berkeley.edu/calnet-technologists/ldap-directory-service/how-ldap-organized/people-ou/people-attribute-schema CalNet LDAP
-    def from_omniauth(auth)
-      raise Error::InvalidAuthProviderError, auth['provider'] \
-        if auth['provider'].to_sym != :calnet
-
-      new(**auth_params_from(auth))
-    end
-
-    private
-
-    # rubocop:disable Metrics/AbcSize, Metrics/MethodLength
-    def auth_params_from(auth)
-      auth_extra = auth['extra']
-      cal_groups = auth_extra['berkeleyEduIsMemberOf'] || []
-
-      # NOTE: berkeleyEduCSID should be same as berkeleyEduStuID for students
-      {
-        affiliations: auth_extra['berkeleyEduAffiliations'],
-        cs_id: auth_extra['berkeleyEduCSID'],
-        department_number: auth_extra['departmentNumber'],
-        display_name: auth_extra['displayName'],
-        email: auth_extra['berkeleyEduAlternateID'] || auth_extra['berkeleyEduAlternateId'],
-        employee_id: auth_extra['employeeNumber'],
-        given_name: auth_extra['givenName'],
-        student_id: auth_extra['berkeleyEduStuID'],
-        surname: auth_extra['surname'],
-        ucpath_id: auth_extra['berkeleyEduUCPathID'],
-        uid: auth_extra['uid'] || auth['uid'],
-        framework_admin: cal_groups.include?(FRAMEWORK_ADMIN_GROUP),
-        alma_admin: cal_groups.include?(ALMA_ADMIN_GROUP)
-      }
-    end
-    # rubocop:enable Metrics/AbcSize, Metrics/MethodLength
-  end
+  include CalnetAuthentication
 
   # Affiliations per CalNet (attribute `berkeleyEduAffiliations` e.g.
   # `EMPLOYEE-TYPE-FACULTY`, `STUDENT-TYPE-REGISTERED`).
diff --git a/config/application.rb b/config/application.rb
index 13d2b032..59298f3f 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -111,6 +111,21 @@ def log_active_storage_root!(active_storage_root)
     config.x.healthcheck_urls.whois = 'https://whois.arin.net/rest/poc/1AD-ARIN'
     config.x.healthcheck_urls.berkeley_service_now = 'https://berkeley.service-now.com/kb_view.do?sysparm_article=KB0011960'
 
+    # CalNet attribute mapping - Maps hash values to CalNet attribute name(s), shared between User model and test calnet_helper;
+    # names need validation in User#from_omniauth and test coverage in calnet_helper_spec.
+    # Array values indicate fallback/alternative attribute names
+    config.calnet_attrs = {
+      affiliations: 'berkeleyEduAffiliations',
+      ucpath_id: 'berkeleyEduUCPathID',
+      student_id: 'berkeleyEduStuID',
+      email: %w[berkeleyEduAlternateID berkeleyEduAlternateId],
+      department_number: 'departmentNumber',
+      display_name: 'displayName',
+      employee_id: 'employeeNumber',
+      given_name: 'givenName',
+      surname: 'surname'
+    }.freeze
+
     config.to_prepare do
       GoodJob::JobsController.class_eval do
         include AuthSupport
diff --git a/spec/calnet_helper.rb b/spec/calnet_helper.rb
index 86804ee1..0a87bfe7 100644
--- a/spec/calnet_helper.rb
+++ b/spec/calnet_helper.rb
@@ -54,7 +54,14 @@ def auth_hash_for(uid)
     calnet_yml_file = "spec/data/calnet/#{uid}.yml"
     raise IOError, "No such file: #{calnet_yml_file}" unless File.file?(calnet_yml_file)
 
-    YAML.load_file(calnet_yml_file)
+    auth_hash = YAML.load_file(calnet_yml_file)
+
+    # Merge in default extra testing fields using attribute names from config
+    attr_names = Rails.application.config.calnet_attrs.values.map { |v| v.is_a?(Array) ? v.first : v }.freeze
+    default_extra_subfields = attr_names.to_h { |attr| [attr, "fake_#{attr}"] }
+    auth_hash['extra'] = default_extra_subfields.merge(auth_hash['extra'] || {})
+
+    auth_hash
   end
 
   # Logs out. Suitable for calling in an after() block.
diff --git a/spec/models/user_spec.rb b/spec/models/user_spec.rb
index eeb8c416..86f6ed98 100644
--- a/spec/models/user_spec.rb
+++ b/spec/models/user_spec.rb
@@ -21,6 +21,33 @@
       expect { User.from_omniauth(auth) }.to raise_error(Error::InvalidAuthProviderError)
     end
 
+    it 'rejects calnet when a required schema attribute is missing or renamed' do
+      auth = {
+        'provider' => 'calnet',
+        'extra' => {
+          'berkeleyEduAffiliations' => 'expected affiliation',
+          'berkeleyEduCSID' => 'expected cs id',
+          'berkeleyEduIsMemberOf' => [],
+          'berkeleyEduUCPathID' => 'expected UC Path ID',
+          'berkeleyEduAlternatid' => 'expected email', # intentionally wrong case to simulate wrong attribute
+          'departmentNumber' => 'expected dept. number',
+          'displayName' => 'expected display name',
+          'employeeNumber' => 'expected employee ID',
+          'givenName' => 'expected given name',
+          'surname' => 'expected surname',
+          'uid' => 'expected UID'
+        }
+      }
+
+      missing = %w[berkeleyEduAlternateID berkeleyEduAlternateId]
+      actual = %w[berkeleyEduAffiliations berkeleyEduAlternatid berkeleyEduCSID berkeleyEduIsMemberOf berkeleyEduUCPathID departmentNumber
+                  displayName employeeNumber givenName surname uid]
+      # rubocop:disable Layout/LineLength
+      msg = "Expected CalNet attribute(s) not found (case-sensitive): #{missing.join(', ')}. The actual CalNet attributes: #{actual.join(', ')}. The user is expected display name"
+      # rubocop:enable Layout/LineLength
+      expect { User.from_omniauth(auth) }.to raise_error(Error::CalnetError, msg)
+    end
+
     it 'populates a User object' do
       framework_admin_ldap = 'cn=edu:berkeley:org:libr:framework:LIBR-framework-admins,ou=campus groups,dc=berkeley,dc=edu'
       auth = {
@@ -32,7 +59,7 @@
           'berkeleyEduAlternateID' => 'expected email',
           'employeeNumber' => 'expected employee ID',
           'givenName' => 'expected given name',
-          'berkeleyEduStuID' => 'expected student ID',
+          'berkeleyEduCSID' => 'expected cs id',
           'surname' => 'expected surname',
           'berkeleyEduUCPathID' => 'expected UC Path ID',
           'uid' => 'expected UID',
@@ -49,7 +76,7 @@
         expect(user.email).to eq('expected email')
         expect(user.employee_id).to eq('expected employee ID')
         expect(user.given_name).to eq('expected given name')
-        expect(user.student_id).to eq('expected student ID')
+        expect(user.student_id).to eq(nil)
         expect(user.surname).to eq('expected surname')
         expect(user.ucpath_id).to eq('expected UC Path ID')
         expect(user.uid).to eq('expected UID')
@@ -67,7 +94,7 @@
           'berkeleyEduAlternateID' => 'expected email',
           'employeeNumber' => 'expected employee ID',
           'givenName' => 'expected given name',
-          'berkeleyEduStuID' => 'expected student ID',
+          'berkeleyEduCSID' => 'expected cs id',
           'surname' => 'expected surname',
           'berkeleyEduUCPathID' => 'expected UC Path ID',
           'uid' => 'expected UID'
@@ -81,7 +108,7 @@
       expect(user.email).to eq('expected email')
       expect(user.employee_id).to eq('expected employee ID')
       expect(user.given_name).to eq('expected given name')
-      expect(user.student_id).to eq('expected student ID')
+      expect(user.student_id).to eq(nil)
       expect(user.surname).to eq('expected surname')
       expect(user.ucpath_id).to eq('expected UC Path ID')
       expect(user.uid).to eq('expected UID')
@@ -102,6 +129,7 @@
           'berkeleyEduStuID' => 'expected student ID',
           'surname' => 'expected surname',
           'berkeleyEduUCPathID' => 'expected UC Path ID',
+          'berkeleyEduCSID' => 'expected cs id',
           'uid' => 'expected UID'
         }
       }
@@ -134,4 +162,74 @@
     end
   end
 
+  describe :verify_calnet_attributes! do
+    it 'allows employee-affiliated users without berkeleyEduStuID' do
+      auth_extra = {
+        'berkeleyEduAffiliations' => ['EMPLOYEE-TYPE-ACADEMIC'],
+        'berkeleyEduCSID' => 'cs123',
+        'berkeleyEduIsMemberOf' => [],
+        'berkeleyEduUCPathID' => 'ucpath456',
+        'berkeleyEduAlternateID' => 'email@berkeley.edu',
+        'departmentNumber' => 'dept1',
+        'displayName' => 'Test Faculty',
+        'employeeNumber' => 'emp789',
+        'givenName' => 'Test',
+        'surname' => 'Faculty',
+        'uid' => 'faculty1'
+      }
+
+      expect { User.from_omniauth({ 'provider' => 'calnet', 'extra' => auth_extra }) }.not_to raise_error
+    end
+
+    it 'allows student-affiliated users without employeeNumber and berkeleyEduUCPathID' do
+      auth_extra = {
+        'berkeleyEduAffiliations' => ['STUDENT-TYPE-REGISTERED'],
+        'berkeleyEduCSID' => 'cs123',
+        'berkeleyEduIsMemberOf' => [],
+        'berkeleyEduStuID' => 'stu456',
+        'berkeleyEduAlternateID' => 'email@berkeley.edu',
+        'departmentNumber' => 'dept1',
+        'displayName' => 'Test Student',
+        'givenName' => 'Test',
+        'surname' => 'Student',
+        'uid' => 'student1'
+      }
+
+      expect { User.from_omniauth({ 'provider' => 'calnet', 'extra' => auth_extra }) }.not_to raise_error
+    end
+
+    it 'rejects student-affiliated users if berkeleyEduStuID is missing' do
+      auth_extra = {
+        'berkeleyEduAffiliations' => ['STUDENT-TYPE-REGISTERED'],
+        'berkeleyEduCSID' => 'cs123',
+        'berkeleyEduIsMemberOf' => [],
+        'berkeleyEduAlternateID' => 'email@berkeley.edu',
+        'departmentNumber' => 'dept1',
+        'displayName' => 'Test Student',
+        'givenName' => 'Test',
+        'surname' => 'Student',
+        'uid' => 'student1'
+      }
+
+      expect { User.from_omniauth({ 'provider' => 'calnet', 'extra' => auth_extra }) }.to raise_error(Error::CalnetError)
+    end
+
+    it 'rejects employee-affiliated users if employeeNumber is missing' do
+      auth_extra = {
+        'berkeleyEduAffiliations' => ['EMPLOYEE-TYPE-STAFF'],
+        'berkeleyEduCSID' => 'cs123',
+        'berkeleyEduIsMemberOf' => [],
+        'berkeleyEduUCPathID' => 'ucpath456',
+        'berkeleyEduAlternateID' => 'email@berkeley.edu',
+        'departmentNumber' => 'dept1',
+        'displayName' => 'Test Staff',
+        'givenName' => 'Test',
+        'surname' => 'Staff',
+        'uid' => 'staff1'
+      }
+
+      expect { User.from_omniauth({ 'provider' => 'calnet', 'extra' => auth_extra }) }.to raise_error(Error::CalnetError)
+    end
+  end
+
 end