diff --git a/app/javascript/vue/repositories/table.vue b/app/javascript/vue/repositories/table.vue
index 9aaf91157..a7c11ce8e 100644
--- a/app/javascript/vue/repositories/table.vue
+++ b/app/javascript/vue/repositories/table.vue
@@ -54,8 +54,27 @@
     v-if="shareRepository"
     :object="shareRepository"
     :globalShareEnabled="true"
+    :confirmationModal="$refs.shareConfirmationModal"
     @close="shareRepository = null"
     @share="updateTable" />
+  <ConfirmationModal
+    ref="shareConfirmationModal"
+    :title="i18n.t('repositories.index.modal_confirm_sharing.title')"
+    :description="`
+      <p>${i18n.t('repositories.index.modal_confirm_sharing.description_1')}</p>
+      <p><b>${i18n.t('repositories.index.modal_confirm_sharing.description_2')}</b></p>
+    `"
+    :confirmClass="'btn btn-danger'"
+    :confirmText="i18n.t('repositories.index.modal_confirm_sharing.confirm')"
+    :e2eAttributes="{
+          modalName: 'e2e-MD-confirmSharingChanges',
+          title: 'e2e-TX-confirmSharingChangesModal-title',
+          content: 'e2e-TX-confirmSharingChangesModal-content',
+          close: 'e2e-BT-confirmSharingChangesModal-close',
+          cancel: 'e2e-BT-confirmSharingChangesModal-cancel',
+          confirm: 'e2e-BT-confirmSharingChangesModal-delete'
+    }"
+  ></ConfirmationModal>
 </template>
 
 <script>
diff --git a/app/javascript/vue/shared/share_modal.vue b/app/javascript/vue/shared/share_modal.vue
index 802bcd207..1b41f577a 100644
--- a/app/javascript/vue/shared/share_modal.vue
+++ b/app/javascript/vue/shared/share_modal.vue
@@ -77,27 +77,52 @@ export default {
   name: 'ShareObjectModal',
   props: {
     object: Object,
-    globalShareEnabled: { type: Boolean, default: false }
+    globalShareEnabled: { type: Boolean, default: false },
+    confirmationModal: { type: Object }
   },
   mixins: [modalMixin],
   data() {
     return {
       sharedWithAllRead: this.object.shared_read || this.object.shared_write,
       sharedWithAllWrite: this.object.shared_write,
-      shareableTeams: [],
-      permission_changes: {}
+      initialState: {},
+      shareableTeams: []
     };
   },
   mounted() {
-    this.getTeams();
+    this.initTeams();
+  },
+  computed: {
+    willUnshare() {
+      if (this.globalShareEnabled && !this.sharedWithAllRead && this.initialState.sharedWithAllRead) return true;
+
+      // true if any team would switch from shared to unshared, based on initial state
+      return this.shareableTeams.some((t) => {
+        return this.initialState.shareableTeams.find((it) => t.id === it.id).attributes.private_shared_with && !t.attributes.private_shared_with;
+      });
+    }
   },
   methods: {
-    getTeams() {
+    initTeams() {
       axios.get(this.object.urls.shareable_teams).then((response) => {
+        this.initialState = {
+          shareableTeams: JSON.parse(JSON.stringify(response.data.data)), // object needs to be deep cloned to get rid of references
+          sharedWithAllRead: this.sharedWithAllRead,
+          sharedWithAllWrite: this.sharedWithAllWrite
+        };
         this.shareableTeams = response.data.data;
       });
     },
-    submit() {
+    async submit() {
+      $(this.$refs.modal).hide();
+
+      if (this.confirmationModal ? !this.willUnshare || await this.confirmationModal.show() : true) {
+        this.doRequest();
+      } else {
+        $(this.$refs.modal).show();
+      }
+    },
+    doRequest() {
       const data = {
         select_all_teams: this.sharedWithAllRead,
         select_all_write_permission: this.sharedWithAllWrite,