diff --git a/triplets/__init__.py b/triplets/__init__.py
index ffd55a8..d0cea8b 100644
--- a/triplets/__init__.py
+++ b/triplets/__init__.py
@@ -47,11 +47,16 @@
 try:
     import duckdb as _duckdb
     import logging as _logging
+    import re as _re  # for table name validation (SQL injection prevention)
 
     _duckdb_logger = _logging.getLogger(__name__)
 
     def _duckdb_read_rdf(self, paths, table_name="triplets", **kwargs):
         """Parse RDF/XML files and load into DuckDB table via Arrow (zero-copy)."""
+        # SECURITY: validate table_name to prevent SQL injection
+        #   allow only safe identifier characters: alphanumeric, underscore, starting with letter/underscore
+        if not _re.match(r'^[a-zA-Z_][a-zA-Z0-9_]*$', table_name):
+            raise ValueError(f"Invalid table name: {table_name}")
         arrow_table = parse(paths, return_type="arrow", **kwargs)
         self.register("_arrow_import", arrow_table)
         self.execute(f"CREATE OR REPLACE TABLE {table_name} AS SELECT * FROM _arrow_import")
@@ -65,4 +70,3 @@ def _duckdb_read_rdf(self, paths, table_name="triplets", **kwargs):
 except ImportError:
     logging.getLogger(__name__).debug("duckdb not installed, skipping read_rdf registration")
     pass
-
diff --git a/triplets/_accessor.py b/triplets/_accessor.py
index e6fb591..2c55285 100644
--- a/triplets/_accessor.py
+++ b/triplets/_accessor.py
@@ -16,6 +16,7 @@
 """
 
 import logging
+import re  # security: used to validate table_name in DuckDB export methods
 import pandas
 
 from . import tools, export
@@ -149,7 +150,11 @@ def _duckdb_export(name):
         """Make a connection method: fetch the triplets table, run the pandas export."""
         function = getattr(export, name)
 
+        # Security fix: validate table_name to prevent SQL injection
+        # Only allow alphanumeric characters and underscores, must start with letter or underscore
         def method(connection, *args, table_name="triplets", **kwargs):
+            if not re.match(r'^[a-zA-Z_][a-zA-Z0-9_]*$', table_name):
+                raise ValueError(f"Invalid table name: {table_name}")
             df = connection.execute(f"SELECT * FROM {table_name}").df()
             return function(df, *args, **kwargs)
 
diff --git a/triplets/cgmes_tools/static/relations_graph.html b/triplets/cgmes_tools/static/relations_graph.html
index d218647..622ad20 100644
--- a/triplets/cgmes_tools/static/relations_graph.html
+++ b/triplets/cgmes_tools/static/relations_graph.html
@@ -4,6 +4,8 @@
 <meta charset="utf-8">
 <title>$title</title>
 <script>$vis_js</script>
+<!-- Include DOMPurify for XSS prevention -->
+<script src="https://cdnjs.cloudflare.com/ajax/libs/dompurify/3.0.6/purify.min.js"></script>
 <style>
     html, body { margin: 0; height: 100%; font-family: sans-serif; }
     #graph { width: 100%; height: 100%; }
@@ -50,7 +52,8 @@
     network.on("selectNode", function (params) {
         const node = nodes.get(params.nodes[0]);
         panelTitle.textContent = node.label;
-        panelContent.innerHTML = node.objectTable || "";
+        // Sanitize HTML to prevent XSS
+        panelContent.innerHTML = DOMPurify.sanitize(node.objectTable || "");
         panel.style.display = "flex";
     });
     network.on("deselectNode", function () { panel.style.display = "none"; });
diff --git a/triplets/rdfs_tools/cim_rdfs_to_html.py b/triplets/rdfs_tools/cim_rdfs_to_html.py
index d4bb868..2796d8f 100644
--- a/triplets/rdfs_tools/cim_rdfs_to_html.py
+++ b/triplets/rdfs_tools/cim_rdfs_to_html.py
@@ -114,7 +114,12 @@ def html_datatable(table, path):
         #print(filename)
 
         if "entsoeUML" in  metadata.keys():
-            folder = os.path.join(metadata["entsoeUML"], metadata["shortName"], "_".join(entsoeURI_list))
+            # Sanitize metadata values to prevent path traversal
+            safe_entsoeUML = os.path.basename(metadata["entsoeUML"])
+            safe_shortName = os.path.basename(metadata["shortName"])
+            safe_entsoeURI_list = [os.path.basename(uri) for uri in entsoeURI_list]
+            
+            folder = os.path.join(safe_entsoeUML, safe_shortName, "_".join(safe_entsoeURI_list))
             if not os.path.exists(folder):
                 os.makedirs(folder)