diff --git a/.changeset/sweet-cherries-drop.md b/.changeset/sweet-cherries-drop.md
new file mode 100644
index 0000000000..67d1f2088c
--- /dev/null
+++ b/.changeset/sweet-cherries-drop.md
@@ -0,0 +1,5 @@
+---
+'@swisspost/design-system-styles': patch
+---
+
+Fixed high contrast mode hover and focus styles for `post-avatar` component in anchor and button contexts.
diff --git a/packages/styles/src/components/avatar.scss b/packages/styles/src/components/avatar.scss
index 63adea6c1c..9a214b388f 100644
--- a/packages/styles/src/components/avatar.scss
+++ b/packages/styles/src/components/avatar.scss
@@ -1,5 +1,6 @@
 @use '../tokens/components';
 @use '../functions/tokens';
+@use './../mixins/utilities';
 
 tokens.$default-map: components.$post-avatar;
 
@@ -14,14 +15,27 @@ button {
     text-decoration: none;
   }
 
+  post-avatar {
+    @include utilities.high-contrast-mode() {
+      border-color: CanvasText;
+    }
+  }
+
   &:hover {
     post-avatar {
       --post-avatar-bg: #{tokens.get('avatar-hover-bg')};
       --post-avatar-fg: #{tokens.get('avatar-hover-fg')};
+      border-color: tokens.get('avatar-hover-bg');
+
+      @include utilities.high-contrast-mode() {
+        border-color: Highlight !important;
+      }
 
       &::after {
         background-color: tokens.get('avatar-image-hover-opacity');
       }
     }
   }
+
+  @include utilities.focus-style;
 }