diff --git a/containers/glassfish/cdi/pom.xml b/containers/glassfish/cdi/pom.xml
index 81af13bc..9e003e07 100755
--- a/containers/glassfish/cdi/pom.xml
+++ b/containers/glassfish/cdi/pom.xml
@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!--
 
+    Copyright (c) 2026 Contributors to the Eclipse Foundation
     Copyright (c) 2013, 2025 Oracle and/or its affiliates. All rights reserved.
 
     This program and the accompanying materials are made available under the
@@ -51,6 +52,11 @@
             <artifactId>jakarta.inject-api</artifactId>
             <version>${inject.api.version}</version>
         </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>
diff --git a/containers/glassfish/cdi/src/main/java/org/glassfish/tyrus/gf/cdi/CdiComponentProvider.java b/containers/glassfish/cdi/src/main/java/org/glassfish/tyrus/gf/cdi/CdiComponentProvider.java
index 5e42c356..ef52355b 100755
--- a/containers/glassfish/cdi/src/main/java/org/glassfish/tyrus/gf/cdi/CdiComponentProvider.java
+++ b/containers/glassfish/cdi/src/main/java/org/glassfish/tyrus/gf/cdi/CdiComponentProvider.java
@@ -1,4 +1,5 @@
 /*
+ * Copyright (c) 2026 Contributors to the Eclipse Foundation
  * Copyright (c) 2013, 2025 Oracle and/or its affiliates. All rights reserved.
  *
  * This program and the accompanying materials are made available under the
@@ -23,9 +24,11 @@
 
 import jakarta.enterprise.context.spi.CreationalContext;
 import jakarta.enterprise.inject.spi.AnnotatedType;
+import jakarta.enterprise.inject.spi.Bean;
 import jakarta.enterprise.inject.spi.BeanManager;
 import jakarta.enterprise.inject.spi.InjectionTarget;
 import jakarta.enterprise.inject.spi.InjectionTargetFactory;
+import jakarta.inject.Singleton;
 import javax.naming.InitialContext;
 import javax.naming.NamingException;
 
@@ -67,6 +70,16 @@ public CdiComponentProvider() throws NamingException {
         }
     }
 
+    /**
+     * Constructor used for testing, which avoids the JNDI lookup of the {@link BeanManager}.
+     *
+     * @param beanManager the bean manager to use, or {@code null} to simulate an environment without CDI.
+     */
+    CdiComponentProvider(BeanManager beanManager) {
+        this.beanManager = beanManager;
+        this.managerRetrieved = (beanManager != null);
+    }
+
     @Override
     public boolean isApplicable(Class<?> c) {
         Annotation[] annotations = c.getAnnotations();
@@ -86,21 +99,63 @@ public boolean isApplicable(Class<?> c) {
     @SuppressWarnings("unchecked")
     @Override
     public <T> Object create(Class<T> c) {
-        if (managerRetrieved) {
-            T managedObject;
-            AnnotatedType annotatedType = beanManager.createAnnotatedType(c);
-            InjectionTargetFactory<T> injectionTargetFactory = beanManager.getInjectionTargetFactory(annotatedType);
-            InjectionTarget<T> it = injectionTargetFactory.createInjectionTarget(null);
-            CreationalContext cc = beanManager.createCreationalContext(null);
-            managedObject = (T) it.produce(cc);
-            it.inject(managedObject, cc);
-            it.postConstruct(managedObject);
-            cdiBeanToContext.put(managedObject, new CdiInjectionContext(it, cc));
-
-            return managedObject;
-        } else {
+        if (!managerRetrieved) {
             return null;
         }
+
+        // If the endpoint is a managed bean with a normal scope (e.g.
+        // @ApplicationScoped, @SessionScoped) or @Singleton, return the shared
+        // contextual reference so that WebSocket lifecycle callbacks, injected
+        // collaborators and CDI event observers all operate on the same bean
+        // instance. Producing a fresh instance per connection (as done below for
+        // dependent beans) would otherwise desynchronize the endpoint state from
+        // the contextual bean seen by observers and other injection points.
+        // See https://github.com/eclipse-ee4j/tyrus/issues/961
+        Bean<?> bean = resolveBean(c);
+        if (bean != null && isShared(bean)) {
+            // Not registered in cdiBeanToContext on purpose: a shared bean must
+            // not be destroyed when a single connection is closed - its lifecycle
+            // is managed by the CDI container.
+            CreationalContext<?> cc = beanManager.createCreationalContext(bean);
+            return beanManager.getReference(bean, c, cc);
+        }
+
+        // Dependent-scoped (or non-bean) endpoints keep the per-connection
+        // instance and are cleaned up by destroy() when the connection closes.
+        T managedObject;
+        AnnotatedType annotatedType = beanManager.createAnnotatedType(c);
+        InjectionTargetFactory<T> injectionTargetFactory = beanManager.getInjectionTargetFactory(annotatedType);
+        InjectionTarget<T> it = injectionTargetFactory.createInjectionTarget(null);
+        CreationalContext cc = beanManager.createCreationalContext(null);
+        managedObject = (T) it.produce(cc);
+        it.inject(managedObject, cc);
+        it.postConstruct(managedObject);
+        cdiBeanToContext.put(managedObject, new CdiInjectionContext(it, cc));
+
+        return managedObject;
+    }
+
+    /**
+     * Resolves the unique managed {@link Bean} for the given endpoint class, or {@code null} when the class is not a
+     * managed bean or cannot be unambiguously resolved (in which case a per-connection instance is created instead).
+     */
+    private Bean<?> resolveBean(Class<?> c) {
+        try {
+            return beanManager.resolve(beanManager.getBeans(c));
+        } catch (Exception e) {
+            // e.g. AmbiguousResolutionException - fall back to a per-connection instance
+            LOGGER.fine(e.getMessage());
+            return null;
+        }
+    }
+
+    /**
+     * @return {@code true} if instances of the given bean are shared, i.e. the bean has a normal scope (such as
+     * {@code @ApplicationScoped} or {@code @SessionScoped}) or is a {@code @Singleton}.
+     */
+    private boolean isShared(Bean<?> bean) {
+        Class<? extends Annotation> scope = bean.getScope();
+        return beanManager.isNormalScope(scope) || Singleton.class.equals(scope);
     }
 
     @Override
diff --git a/containers/glassfish/cdi/src/test/java/org/glassfish/tyrus/gf/cdi/CdiComponentProviderTest.java b/containers/glassfish/cdi/src/test/java/org/glassfish/tyrus/gf/cdi/CdiComponentProviderTest.java
new file mode 100644
index 00000000..317939b6
--- /dev/null
+++ b/containers/glassfish/cdi/src/test/java/org/glassfish/tyrus/gf/cdi/CdiComponentProviderTest.java
@@ -0,0 +1,168 @@
+/*
+ * Copyright (c) 2026 Contributors to the Eclipse Foundation
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0, which is available at
+ * http://www.eclipse.org/legal/epl-2.0.
+ *
+ * This Source Code may also be made available under the following Secondary
+ * Licenses when the conditions for such availability set forth in the
+ * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
+ * version 2 with the GNU Classpath Exception, which is available at
+ * https://www.gnu.org/software/classpath/license.html.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
+ */
+
+package org.glassfish.tyrus.gf.cdi;
+
+import java.lang.annotation.Annotation;
+import java.lang.reflect.InvocationHandler;
+import java.lang.reflect.Method;
+import java.lang.reflect.Proxy;
+import java.util.Collections;
+
+import jakarta.enterprise.context.ApplicationScoped;
+import jakarta.enterprise.context.Dependent;
+import jakarta.enterprise.inject.spi.AnnotatedType;
+import jakarta.enterprise.inject.spi.Bean;
+import jakarta.enterprise.inject.spi.BeanManager;
+import jakarta.inject.Singleton;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNotSame;
+import static org.junit.Assert.assertSame;
+
+/**
+ * Tests that {@link CdiComponentProvider#create(Class)} honours the CDI scope of the endpoint bean: shared scopes
+ * ({@code @ApplicationScoped}, {@code @Singleton}, ...) must reuse a single contextual instance across connections,
+ * while {@code @Dependent} endpoints keep the per-connection instance.
+ *
+ * @see <a href="https://github.com/eclipse-ee4j/tyrus/issues/961">Tyrus issue 961</a>
+ */
+public class CdiComponentProviderTest {
+
+    @ApplicationScoped
+    public static class ApplicationScopedEndpoint {
+    }
+
+    @Singleton
+    public static class SingletonEndpoint {
+    }
+
+    @Dependent
+    public static class DependentEndpoint {
+    }
+
+    @Test
+    public void applicationScopedEndpointReturnsSharedContextualReference() {
+        Object contextualReference = new ApplicationScopedEndpoint();
+        CdiComponentProvider provider =
+                new CdiComponentProvider(fakeBeanManager(ApplicationScoped.class, true, contextualReference));
+
+        // Every connection must observe the same (shared) bean instance.
+        assertSame(contextualReference, provider.create(ApplicationScopedEndpoint.class));
+        assertSame(contextualReference, provider.create(ApplicationScopedEndpoint.class));
+    }
+
+    @Test
+    public void singletonEndpointReturnsSharedContextualReference() {
+        Object contextualReference = new SingletonEndpoint();
+        // @Singleton is a pseudo-scope, so isNormalScope() returns false; it must still be treated as shared.
+        CdiComponentProvider provider =
+                new CdiComponentProvider(fakeBeanManager(Singleton.class, false, contextualReference));
+
+        assertSame(contextualReference, provider.create(SingletonEndpoint.class));
+        assertSame(contextualReference, provider.create(SingletonEndpoint.class));
+    }
+
+    @Test
+    public void dependentEndpointReturnsNewInstancePerConnection() {
+        CdiComponentProvider provider = new CdiComponentProvider(fakeBeanManager(Dependent.class, false, null));
+
+        Object first = provider.create(DependentEndpoint.class);
+        Object second = provider.create(DependentEndpoint.class);
+
+        assertNotNull(first);
+        assertNotNull(second);
+        assertNotSame("@Dependent endpoints must get a fresh instance per connection", first, second);
+    }
+
+    /**
+     * Builds a minimal {@link BeanManager} that exercises only the methods invoked by
+     * {@link CdiComponentProvider#create(Class)}. The shared path returns {@code contextualReference} from
+     * {@code getReference()}; the dependent path produces a fresh instance of the requested class on every call.
+     */
+    private static BeanManager fakeBeanManager(Class<? extends Annotation> scope, boolean normalScope,
+                                               Object contextualReference) {
+        return (BeanManager) newProxy(BeanManager.class, new FakeHandler(scope, normalScope, contextualReference));
+    }
+
+    private static Object newProxy(Class<?> iface, InvocationHandler handler) {
+        return Proxy.newProxyInstance(iface.getClassLoader(), new Class<?>[] {iface}, handler);
+    }
+
+    /**
+     * Single {@link InvocationHandler} backing the fake {@link BeanManager} and the nested CDI SPI objects it returns
+     * ({@link Bean}, {@link AnnotatedType}, the injection-target factory and target, and the creational context). The
+     * method names used by {@code create()} do not collide across those interfaces, so one handler can serve them all.
+     */
+    private static final class FakeHandler implements InvocationHandler {
+
+        private final Class<? extends Annotation> scope;
+        private final boolean normalScope;
+        private final Object contextualReference;
+        private Class<?> producedType;
+
+        private FakeHandler(Class<? extends Annotation> scope, boolean normalScope, Object contextualReference) {
+            this.scope = scope;
+            this.normalScope = normalScope;
+            this.contextualReference = contextualReference;
+        }
+
+        @Override
+        public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
+            switch (method.getName()) {
+                // --- shared-scope resolution path ---
+                case "getBeans":
+                    return Collections.singleton(newProxy(Bean.class, this));
+                case "resolve":
+                    return newProxy(Bean.class, this);
+                case "getScope":
+                    return scope;
+                case "isNormalScope":
+                    return normalScope;
+                case "getReference":
+                    return contextualReference;
+                // --- per-connection (dependent) injection-target path ---
+                case "createAnnotatedType":
+                    producedType = (Class<?>) args[0];
+                    return newProxy(AnnotatedType.class, this);
+                case "getInjectionTargetFactory":
+                    return newProxy(jakarta.enterprise.inject.spi.InjectionTargetFactory.class, this);
+                case "createInjectionTarget":
+                    return newProxy(jakarta.enterprise.inject.spi.InjectionTarget.class, this);
+                case "createCreationalContext":
+                    return newProxy(jakarta.enterprise.context.spi.CreationalContext.class, this);
+                case "produce":
+                    return producedType.getDeclaredConstructor().newInstance();
+                case "inject":
+                case "postConstruct":
+                case "preDestroy":
+                case "dispose":
+                    return null;
+                // --- Object methods ---
+                case "toString":
+                    return "FakeBeanManager";
+                case "hashCode":
+                    return System.identityHashCode(proxy);
+                case "equals":
+                    return proxy == args[0];
+                default:
+                    return method.getReturnType() == boolean.class ? Boolean.FALSE : null;
+            }
+        }
+    }
+}