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coheigea pushed a commit to branch coheigea/misc-fixes
in repository https://gitbox.apache.org/repos/asf/cxf.git

commit 625042c571b80ed11b2d1e56a74efeeb1973ed09
Author: Colm O hEigeartaigh <[email protected]>
AuthorDate: Tue May 12 09:44:48 2026 +0100

    Use URIResolver allowlist for protocols in the STSClient
---
 .../cxf/ws/security/trust/AbstractSTSClient.java   |  6 +++++-
 .../ws/security/trust/AbstractSTSClientTest.java   | 23 ++++++++++++++++++++++
 2 files changed, 28 insertions(+), 1 deletion(-)

diff --git 
a/rt/ws/security/src/main/java/org/apache/cxf/ws/security/trust/AbstractSTSClient.java
 
b/rt/ws/security/src/main/java/org/apache/cxf/ws/security/trust/AbstractSTSClient.java
index fd7a0eac05c..9c4aac9dbd2 100755
--- 
a/rt/ws/security/src/main/java/org/apache/cxf/ws/security/trust/AbstractSTSClient.java
+++ 
b/rt/ws/security/src/main/java/org/apache/cxf/ws/security/trust/AbstractSTSClient.java
@@ -79,6 +79,7 @@ import org.apache.cxf.jaxws.JaxWsProxyFactoryBean;
 import org.apache.cxf.message.Attachment;
 import org.apache.cxf.message.Message;
 import org.apache.cxf.phase.PhaseInterceptorChain;
+import org.apache.cxf.resource.URIResolver;
 import org.apache.cxf.rt.security.claims.ClaimCollection;
 import org.apache.cxf.rt.security.utils.SecurityUtils;
 import org.apache.cxf.service.Service;
@@ -640,7 +641,10 @@ public abstract class AbstractSTSClient implements 
Configurable, InterceptorProv
         dbf.setFeature("http://apache.org/xml/features/disallow-doctype-decl";, 
true);
 
         DocumentBuilder documentBuilder = dbf.newDocumentBuilder();
-        Document document = documentBuilder.parse(schemaLocation);
+        Document document;
+        try (URIResolver resolver = new URIResolver(schemaLocation)) {
+            document = documentBuilder.parse(resolver.getInputStream());
+        }
         return document.getDocumentElement();
     }
 
diff --git 
a/rt/ws/security/src/test/java/org/apache/cxf/ws/security/trust/AbstractSTSClientTest.java
 
b/rt/ws/security/src/test/java/org/apache/cxf/ws/security/trust/AbstractSTSClientTest.java
index e91232220d3..61887908bb4 100644
--- 
a/rt/ws/security/src/test/java/org/apache/cxf/ws/security/trust/AbstractSTSClientTest.java
+++ 
b/rt/ws/security/src/test/java/org/apache/cxf/ws/security/trust/AbstractSTSClientTest.java
@@ -33,6 +33,7 @@ import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertSame;
 import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
 
 public class AbstractSTSClientTest {
 
@@ -78,6 +79,18 @@ public class AbstractSTSClientTest {
         assertEquals(0, client.getDownloadSchemaInvocations());
     }
 
+    @Test
+    public void testFtpProtocolAttemptedDownload() throws Exception {
+        DownloadingAbstractSTSClient client = new 
DownloadingAbstractSTSClient(null);
+        try {
+            
client.downloadSchemaWithDefaultResolver("ftp://example.org/schema.xsd";);
+            fail("Expected an exception for disallowed ftp:// scheme");
+        } catch (Exception ex) {
+            assertTrue(ex.getMessage().contains("ftp"));
+            assertTrue(ex.getMessage().contains("not permitted"));
+        }
+    }
+
     private static final class TestableAbstractSTSClient extends 
AbstractSTSClient {
         private int downloadSchemaInvocations;
         private String lastDownloadedLocation;
@@ -102,4 +115,14 @@ public class AbstractSTSClientTest {
             return lastDownloadedLocation;
         }
     }
+
+    private static final class DownloadingAbstractSTSClient extends 
AbstractSTSClient {
+        DownloadingAbstractSTSClient(Bus bus) {
+            super(bus);
+        }
+
+        Element downloadSchemaWithDefaultResolver(String schemaLocation) 
throws Exception {
+            return super.downloadSchema(schemaLocation);
+        }
+    }
 }

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