diff --git a/js/src/i18n/en_US.json b/js/src/i18n/en_US.json
index 234ea1da5..55450901f 100644
--- a/js/src/i18n/en_US.json
+++ b/js/src/i18n/en_US.json
@@ -1067,5 +1067,10 @@
   "View less": "View less",
   "View more": "View more",
   "Breadcrumbs": "Breadcrumbs",
-  "Other actions": "Other actions"
+  "Other actions": "Other actions",
+  "Only group moderators can create, edit and delete events.": "Only group moderators can create, edit and delete events.",
+  "+ Create a post": "+ Create a post",
+  "Edited {relative_time} ago": "Edited {relative_time} ago",
+  "Members-only post": "Members-only post",
+  "This post is accessible only for members. You have access to it for moderation purposes only because you are an instance moderator.": "This post is accessible only for members. You have access to it for moderation purposes only because you are an instance moderator."
 }
diff --git a/js/src/i18n/fr_FR.json b/js/src/i18n/fr_FR.json
index 9410d7437..cc125b8f9 100644
--- a/js/src/i18n/fr_FR.json
+++ b/js/src/i18n/fr_FR.json
@@ -1158,5 +1158,10 @@
   "View less": "Voir moins",
   "View more": "Voir plus",
   "Breadcrumbs": "Fil d'Ariane",
-  "Other actions": "Autres actions"
+  "Other actions": "Autres actions",
+  "Only group moderators can create, edit and delete events.": "Seule⋅s les modérateur⋅ices de groupe peuvent créer, éditer et supprimer des événements.",
+  "+ Create a post": "+ Créer un billet",
+  "Edited {relative_time} ago": "Édité il y a {relative_time}",
+  "Members-only post": "Billet reservé aux membres",
+  "This post is accessible only for members. You have access to it for moderation purposes only because you are an instance moderator.": "Ce billet est accessible uniquement aux membres. Vous y avez accès à des fins de modération car vous êtes modérateur⋅ice de l'instance."
 }
diff --git a/js/src/mixins/group.ts b/js/src/mixins/group.ts
index b287fbd84..9b320e6a6 100644
--- a/js/src/mixins/group.ts
+++ b/js/src/mixins/group.ts
@@ -84,6 +84,14 @@ export default class GroupMixin extends Vue {
     ]);
   }
 
+  get isCurrentActorAGroupMember(): boolean {
+    return this.hasCurrentActorThisRole([
+      MemberRole.MODERATOR,
+      MemberRole.ADMINISTRATOR,
+      MemberRole.MEMBER,
+    ]);
+  }
+
   hasCurrentActorThisRole(givenRole: string | string[]): boolean {
     const roles = Array.isArray(givenRole) ? givenRole : [givenRole];
     return (
diff --git a/js/src/views/Group/Group.vue b/js/src/views/Group/Group.vue
index 34d068248..f659406fa 100644
--- a/js/src/views/Group/Group.vue
+++ b/js/src/views/Group/Group.vue
@@ -404,7 +404,7 @@
                 params: { preferredUsername: usernameWithDomain(group) },
               }"
               class="button is-primary"
-              >{{ $t("+ Post a public message") }}</router-link
+              >{{ $t("+ Create a post") }}</router-link
             >
           </template>
         </group-section>
@@ -800,31 +800,11 @@ export default class Group extends mixins(GroupMixin) {
     return undefined;
   }
 
-  get groupMemberships(): (string | undefined)[] {
-    return this.person?.memberships?.elements
-      .filter(
-        (membership: IMember) =>
-          ![
-            MemberRole.REJECTED,
-            MemberRole.NOT_APPROVED,
-            MemberRole.INVITED,
-          ].includes(membership.role)
-      )
-      .map(({ parent: { id } }) => id);
-  }
-
   @Watch("isCurrentActorAGroupMember")
   refetchGroupData(): void {
     this.$apollo.queries.group.refetch();
   }
 
-  get isCurrentActorAGroupMember(): boolean {
-    return (
-      this.groupMemberships !== undefined &&
-      this.groupMemberships.includes(this.group.id)
-    );
-  }
-
   get isCurrentActorARejectedGroupMember(): boolean {
     return (
       this.person &&
diff --git a/js/src/views/Posts/List.vue b/js/src/views/Posts/List.vue
index 1fb176f33..85288374e 100644
--- a/js/src/views/Posts/List.vue
+++ b/js/src/views/Posts/List.vue
@@ -45,7 +45,7 @@
             params: { preferredUsername: usernameWithDomain(group) },
           }"
           class="button is-primary"
-          >{{ $t("+ Post a public message") }}</router-link
+          >{{ $t("+ Create a post") }}</router-link
         >
       </div>
       <div class="post-list">
diff --git a/js/src/views/Posts/Post.vue b/js/src/views/Posts/Post.vue
index 221f87e15..671475fc7 100644
--- a/js/src/views/Posts/Post.vue
+++ b/js/src/views/Posts/Post.vue
@@ -1,5 +1,5 @@
 <template>
-  <article class="container" v-if="post">
+  <article class="container post" v-if="post">
     <header>
       <div class="banner-container">
         <lazy-image-wrapper :picture="post.picture" />
@@ -78,6 +78,24 @@
         </div>
       </div>
     </header>
+    <b-message
+      :title="$t('Members-only post')"
+      class="mx-4"
+      type="is-warning"
+      :closable="false"
+      v-if="
+        !$apollo.loading &&
+        isInstanceModerator &&
+        !isCurrentActorAGroupMember &&
+        post.visibility === PostVisibility.PRIVATE
+      "
+    >
+      {{
+        $t(
+          "This post is accessible only for members. You have access to it for moderation purposes only because you are an instance moderator."
+        )
+      }}
+    </b-message>
 
     <section v-html="post.body" class="content" />
     <section class="tags">
@@ -96,7 +114,7 @@
 import { Component, Prop } from "vue-property-decorator";
 import { mixins } from "vue-class-component";
 import GroupMixin from "@/mixins/group";
-import { PostVisibility } from "@/types/enums";
+import { ICurrentUserRole, PostVisibility } from "@/types/enums";
 import { IMember } from "@/types/actor/member.model";
 import {
   CURRENT_ACTOR_CLIENT,
@@ -111,9 +129,12 @@ import Tag from "../../components/Tag.vue";
 import LazyImageWrapper from "../../components/Image/LazyImageWrapper.vue";
 import ActorInline from "../../components/Account/ActorInline.vue";
 import { formatDistanceToNowStrict } from "date-fns";
+import { CURRENT_USER_CLIENT } from "@/graphql/user";
+import { ICurrentUser } from "@/types/current-user.model";
 
 @Component({
   apollo: {
+    currentUser: CURRENT_USER_CLIENT,
     currentActor: CURRENT_ACTOR_CLIENT,
     memberships: {
       query: PERSON_MEMBERSHIPS,
@@ -187,6 +208,8 @@ export default class Post extends mixins(GroupMixin) {
 
   RouteName = RouteName;
 
+  currentUser!: ICurrentUser;
+
   usernameWithDomain = usernameWithDomain;
 
   formatDistanceToNowStrict = formatDistanceToNowStrict;
@@ -205,10 +228,17 @@ export default class Post extends mixins(GroupMixin) {
       .map(({ parent: { id } }) => id)
       .includes(this.post.attributedTo.id);
   }
+
+  get isInstanceModerator(): boolean {
+    return [
+      ICurrentUserRole.ADMINISTRATOR,
+      ICurrentUserRole.MODERATOR,
+    ].includes(this.currentUser.role);
+  }
 }
 </script>
 <style lang="scss" scoped>
-article {
+article.post {
   background: $white !important;
   header {
     display: flex;
diff --git a/js/tests/unit/specs/components/Group/GroupSection.spec.ts b/js/tests/unit/specs/components/Group/GroupSection.spec.ts
index 970d2dc1a..73932edfc 100644
--- a/js/tests/unit/specs/components/Group/GroupSection.spec.ts
+++ b/js/tests/unit/specs/components/Group/GroupSection.spec.ts
@@ -16,7 +16,7 @@ const groupDomain = "remotedomain.net";
 const groupUsername = `${groupPreferredUsername}@${groupDomain}`;
 
 const defaultSlotText = "A list of elements";
-const createSlotButtonText = "+ Post a public message";
+const createSlotButtonText = "+ Create a post";
 
 type Props = {
   title?: string;
diff --git a/js/tests/unit/specs/components/Group/__snapshots__/GroupSection.spec.ts.snap b/js/tests/unit/specs/components/Group/__snapshots__/GroupSection.spec.ts.snap
index f77d39f5b..14071e239 100644
--- a/js/tests/unit/specs/components/Group/__snapshots__/GroupSection.spec.ts.snap
+++ b/js/tests/unit/specs/components/Group/__snapshots__/GroupSection.spec.ts.snap
@@ -8,7 +8,7 @@ exports[`GroupSection renders group section with basic informations 1`] = `
   <div class="main-slot">
     <div>A list of elements</div>
   </div>
-  <div class="create-slot"><a href="/@my_group@remotedomain.net/p/new" class="button is-primary">+ Post a public message</a></div>
+  <div class="create-slot"><a href="/@my_group@remotedomain.net/p/new" class="button is-primary">+ Create a post</a></div>
 </section>
 `;
 
@@ -20,6 +20,6 @@ exports[`GroupSection renders public group section 1`] = `
   <div class="main-slot">
     <div>A list of elements</div>
   </div>
-  <div class="create-slot"><a href="/@my_group@remotedomain.net/p/new" class="button is-primary">+ Post a public message</a></div>
+  <div class="create-slot"><a href="/@my_group@remotedomain.net/p/new" class="button is-primary">+ Create a post</a></div>
 </section>
 `;
diff --git a/lib/graphql/resolvers/post.ex b/lib/graphql/resolvers/post.ex
index e7631a6c3..0ea6b21e1 100644
--- a/lib/graphql/resolvers/post.ex
+++ b/lib/graphql/resolvers/post.ex
@@ -65,7 +65,7 @@ defmodule Mobilizon.GraphQL.Resolvers.Post do
         %{slug: slug},
         %{
           context: %{
-            current_user: %User{} = user
+            current_user: %User{role: user_role} = user
           }
         } = _resolution
       ) do
@@ -73,7 +73,9 @@ defmodule Mobilizon.GraphQL.Resolvers.Post do
            {:current_actor, Users.get_actor_for_user(user)},
          {:post, %Post{attributed_to: %Actor{}} = post} <-
            {:post, Posts.get_post_by_slug_with_preloads(slug)},
-         {:member, true} <- {:member, Permission.can_access_group_object?(current_profile, post)} do
+         {:member, true} <-
+           {:member,
+            Permission.can_access_group_object?(current_profile, post) or is_moderator(user_role)} do
       {:ok, post}
     else
       {:member, false} -> get_post(parent, %{slug: slug}, nil)