diff --git a/dspace-api/src/main/java/org/dspace/content/BitstreamServiceImpl.java b/dspace-api/src/main/java/org/dspace/content/BitstreamServiceImpl.java
index cc89cea33a..1653266056 100644
--- a/dspace-api/src/main/java/org/dspace/content/BitstreamServiceImpl.java
+++ b/dspace-api/src/main/java/org/dspace/content/BitstreamServiceImpl.java
@@ -403,7 +403,7 @@ public class BitstreamServiceImpl extends DSpaceObjectServiceImpl<Bitstream> imp
 
     @Override
     public Bitstream getThumbnail(Context context, Bitstream bitstream) throws SQLException {
-        Pattern pattern = Pattern.compile("^" + bitstream.getName() + ".([^.]+)$");
+        Pattern pattern = getBitstreamNamePattern(bitstream);
 
         for (Bundle bundle : bitstream.getBundles()) {
             for (Item item : bundle.getItems()) {
@@ -420,6 +420,13 @@ public class BitstreamServiceImpl extends DSpaceObjectServiceImpl<Bitstream> imp
         return null;
     }
 
+    protected Pattern getBitstreamNamePattern(Bitstream bitstream) {
+        if (bitstream.getName() != null) {
+            return Pattern.compile("^" + Pattern.quote(bitstream.getName()) + ".([^.]+)$");
+        }
+        return Pattern.compile("^" + bitstream.getName() + ".([^.]+)$");
+    }
+
     @Override
     public BitstreamFormat getFormat(Context context, Bitstream bitstream) throws SQLException {
         if (bitstream.getBitstreamFormat() == null) {
diff --git a/dspace-server-webapp/src/test/java/org/dspace/app/rest/BitstreamRestRepositoryIT.java b/dspace-server-webapp/src/test/java/org/dspace/app/rest/BitstreamRestRepositoryIT.java
index bc276557df..864acf1a56 100644
--- a/dspace-server-webapp/src/test/java/org/dspace/app/rest/BitstreamRestRepositoryIT.java
+++ b/dspace-server-webapp/src/test/java/org/dspace/app/rest/BitstreamRestRepositoryIT.java
@@ -1695,6 +1695,53 @@ public class BitstreamRestRepositoryIT extends AbstractControllerIntegrationTest
                              .andExpect(jsonPath("$.type", is("bitstream")));
     }
 
+    @Test
+    public void thumbnailEndpointTestWithSpecialCharactersInFileName() throws Exception {
+        // Given an Item
+        context.turnOffAuthorisationSystem();
+
+        parentCommunity = CommunityBuilder.createCommunity(context)
+            .withName("Parent Community")
+            .build();
+
+        Collection col1 = CollectionBuilder.createCollection(context, parentCommunity)
+            .withName("Collection 1").build();
+
+        Item item = ItemBuilder.createItem(context, col1)
+            .withTitle("Test item -- thumbnail")
+            .withIssueDate("2017-10-17")
+            .withAuthor("Smith, Donald").withAuthor("Doe, John")
+            .build();
+
+        Bundle originalBundle = BundleBuilder.createBundle(context, item)
+            .withName(Constants.DEFAULT_BUNDLE_NAME)
+            .build();
+        Bundle thumbnailBundle = BundleBuilder.createBundle(context, item)
+            .withName("THUMBNAIL")
+            .build();
+
+        InputStream is = IOUtils.toInputStream("dummy", "utf-8");
+
+        // With an ORIGINAL Bitstream & matching THUMBNAIL Bitstream containing special characters in filenames
+        Bitstream bitstream = BitstreamBuilder.createBitstream(context, originalBundle, is)
+            .withName("test (2023) file.pdf")
+            .withMimeType("application/pdf")
+            .build();
+        Bitstream thumbnail = BitstreamBuilder.createBitstream(context, thumbnailBundle, is)
+            .withName("test (2023) file.pdf.jpg")
+            .withMimeType("image/jpeg")
+            .build();
+
+        context.restoreAuthSystemState();
+
+        String tokenAdmin = getAuthToken(admin.getEmail(), password);
+
+        getClient(tokenAdmin).perform(get("/api/core/bitstreams/" + bitstream.getID() + "/thumbnail"))
+            .andExpect(status().isOk())
+            .andExpect(jsonPath("$.uuid", Matchers.is(thumbnail.getID().toString())))
+            .andExpect(jsonPath("$.type", is("bitstream")));
+    }
+
     @Test
     public void thumbnailEndpointMultipleThumbnailsWithPrimaryBitstreamTest() throws Exception {
         // Given an Item