diff --git a/src/ExtendableAttributesTrait.php b/src/ExtendableAttributesTrait.php
index 644cc6e..a43979f 100644
--- a/src/ExtendableAttributesTrait.php
+++ b/src/ExtendableAttributesTrait.php
@@ -96,6 +96,7 @@ public function getAttributesNS(): array
     protected static function getAttributesNSFromXML(DOMElement $xml, NS|array $namespace = null): array
     {
         $namespace = $namespace ?? static::XS_ANY_ATTR_NAMESPACE;
+        $exclusionList = static::getAttributeExclusions();
         $attributes = [];
 
         // Validate namespace value
@@ -103,28 +104,18 @@ protected static function getAttributesNSFromXML(DOMElement $xml, NS|array $name
             // Must be one of the predefined values
             Assert::oneOf($namespace, NS::cases());
 
-            if ($namespace === NS::ANY) {
-                foreach ($xml->attributes as $a) {
-                    $attributes[] = new Attribute($a->namespaceURI, $a->prefix, $a->localName, $a->nodeValue);
-                }
-            } elseif ($namespace === NS::LOCAL) {
-                foreach ($xml->attributes as $a) {
-                    if ($a->namespaceURI === null) {
-                        $attributes[] = new Attribute($a->namespaceURI, $a->prefix, $a->localName, $a->nodeValue);
-                    }
-                }
-            } elseif ($namespace === NS::OTHER) {
-                foreach ($xml->attributes as $a) {
-                    if (!in_array($a->namespaceURI, [static::NS, null], true)) {
-                        $attributes[] = new Attribute($a->namespaceURI, $a->prefix, $a->localName, $a->nodeValue);
-                    }
-                }
-            } elseif ($namespace === NS::TARGET) {
-                foreach ($xml->attributes as $a) {
-                    if ($a->namespaceURI === static::NS) {
-                        $attributes[] = new Attribute($a->namespaceURI, $a->prefix, $a->localName, $a->nodeValue);
-                    }
+            foreach ($xml->attributes as $a) {
+                if (in_array([$a->namespaceURI, $a->localName], $exclusionList, true)) {
+                    continue;
+                } elseif ($namespace === NS::OTHER && in_array($a->namespaceURI, [static::NS, null], true)) {
+                    continue;
+                } elseif ($namespace === NS::TARGET && $a->namespaceURI !== static::NS) {
+                    continue;
+                } elseif ($namespace === NS::LOCAL && $a->namespaceURI !== null) {
+                    continue;
                 }
+
+                $attributes[] = new Attribute($a->namespaceURI, $a->prefix, $a->localName, $a->nodeValue);
             }
         } else {
             // Array must be non-empty and cannot contain ##any or ##other
@@ -144,9 +135,13 @@ protected static function getAttributesNSFromXML(DOMElement $xml, NS|array $name
             }
 
             foreach ($xml->attributes as $a) {
-                if (in_array($a->namespaceURI, $namespace, true)) {
-                    $attributes[] = new Attribute($a->namespaceURI, $a->prefix, $a->localName, $a->nodeValue);
+                if (in_array([$a->namespaceURI, $a->localName], $exclusionList, true)) {
+                    continue;
+                } elseif (!in_array($a->namespaceURI, $namespace, true)) {
+                    continue;
                 }
+
+                $attributes[] = new Attribute($a->namespaceURI, $a->prefix, $a->localName, $a->nodeValue);
             }
         }
 
@@ -230,6 +225,13 @@ function (Attribute $attr) {
             }
         }
 
+        $exclusionList = static::getAttributeExclusions();
+        foreach ($attributes as $i => $attr) {
+            if (in_array([$attr->getNamespaceURI(), $attr->getAttrName()], $exclusionList, true)) {
+                unset($attributes[$i]);
+            }
+        }
+
         $this->namespacedAttributes = $attributes;
     }
 
@@ -249,4 +251,19 @@ public function getAttributeNamespace(): array|NS
 
         return static::XS_ANY_ATTR_NAMESPACE;
     }
+
+
+    /**
+     * Get the exclusions list for getAttributeNSFromXML.
+     *
+     * @return array<string, string>
+     */
+    public static function getAttributeExclusions(): array
+    {
+        if (defined('static::XS_ANY_ATTR_EXCLUSIONS')) {
+            return static::XS_ANY_ATTR_EXCLUSIONS;
+        }
+
+        return [];
+    }
 }
diff --git a/tests/Utils/ExtendableAttributesElement.php b/tests/Utils/ExtendableAttributesElement.php
index ff022e8..8502325 100644
--- a/tests/Utils/ExtendableAttributesElement.php
+++ b/tests/Utils/ExtendableAttributesElement.php
@@ -33,6 +33,11 @@ class ExtendableAttributesElement extends AbstractElement
     /** @var string|\SimpleSAML\XML\XsNamespace */
     public const XS_ANY_ATTR_NAMESPACE = NS::ANY;
 
+    /** @var array{array{string, string}} */
+    public const XS_ANY_ATTR_EXCLUSIONS = [
+        ['urn:x-simplesamlphp:namespace', 'attr3'],
+    ];
+
 
     /**
      * Get the namespace for the element.
diff --git a/tests/XML/ExtendableAttributesTest.php b/tests/XML/ExtendableAttributesTest.php
index 17603f4..1b89cf6 100644
--- a/tests/XML/ExtendableAttributesTest.php
+++ b/tests/XML/ExtendableAttributesTest.php
@@ -49,6 +49,7 @@ public function testMarshalling(): void
             [
                 new Attribute('urn:x-simplesamlphp:namespace', 'ssp', 'attr1', 'testval1'),
                 new Attribute('urn:x-simplesamlphp:namespace', 'ssp', 'attr2', 'testval2'),
+                new Attribute('urn:x-simplesamlphp:namespace', 'ssp', 'attr3', 'testval3'),
             ],
         );
 
@@ -57,4 +58,27 @@ public function testMarshalling(): void
             strval($extendableElement),
         );
     }
+
+
+    /**
+     */
+    public function testGetAttributesNSFromXML(): void
+    {
+        /** @var \DOMElement $element */
+        $element = self::$xmlRepresentation->documentElement;
+
+        $elt = ExtendableAttributesElement::fromXML($element);
+        $attributes = $elt->getAttributesNS();
+
+        $this->assertCount(2, $attributes);
+        $this->assertEquals($attributes[0]->getNamespaceURI(), 'urn:x-simplesamlphp:namespace');
+        $this->assertEquals($attributes[0]->getNamespacePrefix(), 'ssp');
+        $this->assertEquals($attributes[0]->getAttrName(), 'attr1');
+        $this->assertEquals($attributes[0]->getAttrValue(), 'testval1');
+
+        $this->assertEquals($attributes[1]->getNamespaceURI(), 'urn:x-simplesamlphp:namespace');
+        $this->assertEquals($attributes[1]->getNamespacePrefix(), 'ssp');
+        $this->assertEquals($attributes[1]->getAttrName(), 'attr2');
+        $this->assertEquals($attributes[1]->getAttrValue(), 'testval2');
+    }
 }