diff --git a/src/socket/__tests__/socketuser.test.js b/src/socket/__tests__/socketuser.test.js
index f812907..cf6f564 100644
--- a/src/socket/__tests__/socketuser.test.js
+++ b/src/socket/__tests__/socketuser.test.js
@@ -335,5 +335,24 @@ describe('SocketUser', () => {
         socketUser.notificationManager.removeAllListeners
       ).toHaveBeenCalled();
     });
+
+    it('should cancel tracked scan sessions', async () => {
+      socketUser.scanSessions.set('session-1', 'host-1');
+      socketUser.scanSessions.set('session-2', 'host-2');
+
+      await socketUser.handleDisconnect();
+
+      expect(socketUser.actionManager.sendObjectAction).toHaveBeenCalledWith(
+        'host-1',
+        'host',
+        { type: 'scanNetworkStop', data: { sessionId: 'session-1' } }
+      );
+      expect(socketUser.actionManager.sendObjectAction).toHaveBeenCalledWith(
+        'host-2',
+        'host',
+        { type: 'scanNetworkStop', data: { sessionId: 'session-2' } }
+      );
+      expect(socketUser.scanSessions.size).toBe(0);
+    });
   });
 });
diff --git a/src/socket/socketuser.js b/src/socket/socketuser.js
index f6b4c5f..977062b 100644
--- a/src/socket/socketuser.js
+++ b/src/socket/socketuser.js
@@ -35,6 +35,7 @@ export class SocketUser {
     this.serverManager = new ServerManager(this);
     this.userSettingsManager = new UserSettingsManager(this);
     this.keycloakAuth = new KeycloakAuth();
+    this.scanSessions = new Map();
     this.setupSocketEventHandlers();
   }
 
@@ -352,15 +353,52 @@ export class SocketUser {
   }
 
   async handleObjectActionEvent(data, callback) {
+    const action = data?.action;
+    const sessionId = action?.data?.sessionId;
+
+    if (
+      data?.objectType === 'host' &&
+      action?.type === 'scanNetwork' &&
+      sessionId
+    ) {
+      this.scanSessions.set(sessionId, data._id);
+    }
+
+    if (action?.type === 'scanNetworkStop' && sessionId) {
+      this.scanSessions.delete(sessionId);
+    }
+
     await this.actionManager.sendObjectAction(
       data._id,
       data.objectType,
-      data.action,
+      action,
       callback
     );
   }
 
+  async cancelScanSessions() {
+    const sessions = Array.from(this.scanSessions.entries());
+    this.scanSessions.clear();
+
+    if (sessions.length === 0) {
+      return;
+    }
+
+    logger.info('Cancelling scan sessions on user disconnect:', sessions.length);
+
+    await Promise.all(
+      sessions.map(([sessionId, hostId]) =>
+        this.actionManager.sendObjectAction(hostId, 'host', {
+          type: 'scanNetworkStop',
+          data: { sessionId }
+        })
+      )
+    );
+  }
+
   async handleDisconnect() {
+    await this.cancelScanSessions();
+
     if (this.user?._id) {
       const userId = this.user._id.toString();
       for (const activityKey of this.trackedActivities) {