diff --git a/shelfmark/release_sources/audiobookbay/handler.py b/shelfmark/release_sources/audiobookbay/handler.py
index e4fbf70b..723fbfcc 100644
--- a/shelfmark/release_sources/audiobookbay/handler.py
+++ b/shelfmark/release_sources/audiobookbay/handler.py
@@ -24,6 +24,8 @@ if TYPE_CHECKING:
     from shelfmark.core.models import DownloadTask
 
 logger = setup_logger(__name__)
+DEFAULT_ABB_HOSTNAME = "audiobookbay.lu"
+ALLOWED_DETAIL_URL_SCHEMES = {"https"}
 
 
 def _resolve_configured_hostname() -> str:
@@ -32,6 +34,23 @@ def _resolve_configured_hostname() -> str:
     return normalize_hostname(configured_hostname if isinstance(configured_hostname, str) else "")
 
 
+def _resolve_allowed_detail_hostname() -> str:
+    """Return the ABB hostname allowed for queued detail URLs."""
+    return _resolve_configured_hostname() or DEFAULT_ABB_HOSTNAME
+
+
+def _detail_url_matches_host(detail_url: str, hostname: str) -> bool:
+    """Return True when a detail URL uses the allowed ABB scheme and host."""
+    parsed = urlparse(detail_url)
+    detail_hostname = normalize_hostname(parsed.hostname)
+    allowed_hostname = normalize_hostname(hostname).lower().rstrip(".")
+    return (
+        parsed.scheme.lower() in ALLOWED_DETAIL_URL_SCHEMES
+        and bool(detail_hostname)
+        and detail_hostname.lower().rstrip(".") == allowed_hostname
+    )
+
+
 @register_handler("audiobookbay")
 class AudiobookBayHandler(ExternalClientHandler):
     """Handler for AudiobookBay downloads via configured torrent client."""
@@ -69,9 +88,14 @@ class AudiobookBayHandler(ExternalClientHandler):
             logger.warning("Missing details URL for AudiobookBay task: %s", task.task_id)
             return None
 
-        hostname = _resolve_configured_hostname()
-        if not hostname:
-            hostname = normalize_hostname(urlparse(detail_url).hostname)
+        hostname = _resolve_allowed_detail_hostname()
+        if not _detail_url_matches_host(detail_url, hostname):
+            status_callback("error", "Invalid AudiobookBay details URL")
+            logger.warning(
+                "Rejected AudiobookBay details URL with invalid scheme or host: %s",
+                detail_url,
+            )
+            return None
 
         status_callback("resolving", "Extracting magnet link")
         magnet_link = scraper.extract_magnet_link(detail_url, hostname)
diff --git a/tests/audiobookbay/test_handler.py b/tests/audiobookbay/test_handler.py
index 27af8b8e..8fdd1afe 100644
--- a/tests/audiobookbay/test_handler.py
+++ b/tests/audiobookbay/test_handler.py
@@ -120,6 +120,83 @@ class TestAudiobookBayHandlerDownload:
         )
         assert "resolving" in recorder.statuses
 
+    @patch("shelfmark.release_sources.audiobookbay.handler.scraper.extract_magnet_link")
+    @patch("shelfmark.release_sources.audiobookbay.handler.get_client")
+    @patch("shelfmark.release_sources.audiobookbay.handler.config.get")
+    def test_download_rejects_source_url_host_mismatch(
+        self, mock_config_get, mock_get_client, mock_extract_magnet
+    ):
+        """Test hostile detail URLs are rejected before page fetch."""
+        mock_config_get.side_effect = lambda key, default="": (
+            "audiobookbay.lu" if key == "ABB_HOSTNAME" else default
+        )
+
+        handler = AudiobookBayHandler()
+        task = DownloadTask(
+            task_id="35f56a3e5734bfa69c3169ee8e605a60",
+            source="audiobookbay",
+            title="Test Book",
+            content_type="audiobook",
+            source_url="https://169.254.169.254/latest/meta-data/",
+        )
+        cancel_flag = Event()
+        recorder = ProgressRecorder()
+
+        result = handler.download(
+            task=task,
+            cancel_flag=cancel_flag,
+            progress_callback=recorder.progress_callback,
+            status_callback=recorder.status_callback,
+        )
+
+        assert result is None
+        assert recorder.last_status == "error"
+        assert "details url" in recorder.last_message.lower()
+        mock_extract_magnet.assert_not_called()
+        mock_get_client.assert_not_called()
+
+    @patch("shelfmark.release_sources.audiobookbay.handler.scraper.extract_magnet_link")
+    @patch("shelfmark.release_sources.audiobookbay.handler.get_client")
+    @patch("shelfmark.release_sources.audiobookbay.handler.config.get")
+    def test_download_allows_configured_source_url_host(
+        self, mock_config_get, mock_get_client, mock_extract_magnet
+    ):
+        """Test configured ABB host remains allowed for queued release URLs."""
+        mock_config_get.side_effect = lambda key, default="": (
+            "https://audiobookbay.lu/" if key == "ABB_HOSTNAME" else default
+        )
+        mock_extract_magnet.return_value = "magnet:?xt=urn:btih:abc123"
+
+        mock_client = MagicMock()
+        mock_client.name = "qbittorrent"
+        mock_client.find_existing.return_value = None
+        mock_client.add_download.return_value = "download_id_123"
+        mock_get_client.return_value = mock_client
+
+        handler = AudiobookBayHandler()
+        task = DownloadTask(
+            task_id="35f56a3e5734bfa69c3169ee8e605a60",
+            source="audiobookbay",
+            title="Test Book",
+            content_type="audiobook",
+            source_url="https://audiobookbay.lu/abss/test-book/",
+        )
+        cancel_flag = Event()
+        recorder = ProgressRecorder()
+        with patch.object(AudiobookBayHandler, "_poll_and_complete", return_value=None):
+            result = handler.download(
+                task=task,
+                cancel_flag=cancel_flag,
+                progress_callback=recorder.progress_callback,
+                status_callback=recorder.status_callback,
+            )
+
+        assert result is None
+        mock_extract_magnet.assert_called_once_with(
+            "https://audiobookbay.lu/abss/test-book/", "audiobookbay.lu"
+        )
+        mock_client.add_download.assert_called_once()
+
     @patch("shelfmark.release_sources.audiobookbay.handler.scraper.extract_magnet_link")
     @patch("shelfmark.release_sources.audiobookbay.handler.get_client")
     def test_download_existing_complete(self, mock_get_client, mock_extract_magnet):