# Data & Security when updating prepopulate fields
**URL:** https://forum.mautic.org/t/data-security-when-updating-prepopulate-fields/2537
**Category:** Product Support
**Created:** [October 19, 2015, 5:21pm UTC](https://forum.mautic.org/t/data-security-when-updating-prepopulate-fields/2537 "2015-10-19T17:21:58Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@seti](https://forum.mautic.org/u/seti)
#### Post date: [October 19, 2015, 5:21pm UTC](https://forum.mautic.org/t/data-security-when-updating-prepopulate-fields/2537/1 "2015-10-19T17:21:58Z")
Hi All!
I would like to pre-populate lead data in a form to allow leads to confirm/modify their data.
The scenario is as follows (something like you describe in [https://www.mautic.org/community/index.php/307-using-mautic-for-event-registration/0](https://www.mautic.org/community/index.php/307-using-mautic-for-event-registration/0)):
1. I send a mail to a lead with some data
2. The user clicks in a button to go to a landing page with a form
3. The form is auto-filled with his data
4. The user can update his data (email, tel, address…)
The problem is about security: if a lead knows the email addresses of another leads he is able to modify the data of these another leads.
I’m not sure how to manage this issue, I tried making a new field (ID number) that is Unique Identifier as well as Email is and adding it as a hidden field in the form, but my security problem persists.
Do you have any idea about how to manage this to ensure that a lead only is able to modify his own data?
Thanks
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### Author:  [@escopecz](https://forum.mautic.org/u/escopecz)
#### Post date: [October 21, 2015, 7:40am UTC](https://forum.mautic.org/t/data-security-when-updating-prepopulate-fields/2537/2 "2015-10-21T07:40:47Z")
@seti I take Mautic as a marketing automation tool which is able to cooperate with other tools for specific tasks like CRM, CMS and so on. You can use some CMS like WordPress or Joomla to let leads to register and keep their data securely updatable after login and send the data on form submit to Mautic.
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### Author:  [@seti](https://forum.mautic.org/u/seti)
#### Post date: [October 19, 2015, 5:21pm UTC](https://forum.mautic.org/t/data-security-when-updating-prepopulate-fields/2537/3 "2015-10-19T17:21:58Z")
Hi All!
I would like to pre-populate lead data in a form to allow leads to confirm/modify their data.
The scenario is as follows (something like you describe in [https://www.mautic.org/community/index.php/307-using-mautic-for-event-registration/0](https://www.mautic.org/community/index.php/307-using-mautic-for-event-registration/0)):
1. I send a mail to a lead with some data
2. The user clicks in a button to go to a landing page with a form
3. The form is auto-filled with his data
4. The user can update his data (email, tel, address…)
The problem is about security: if a lead knows the email addresses of another leads he is able to modify the data of these another leads.
I’m not sure how to manage this issue, I tried making a new field (ID number) that is Unique Identifier as well as Email is and adding it as a hidden field in the form, but my security problem persists.
Do you have any idea about how to manage this to ensure that a lead only is able to modify his own data?
Thanks
---
### Author:  [@The\_Media\_House](https://forum.mautic.org/u/The_Media_House)
#### Post date: [October 19, 2015, 7:55pm UTC](https://forum.mautic.org/t/data-security-when-updating-prepopulate-fields/2537/4 "2015-10-19T19:55:16Z")
Question, did you manage to get the data shown as pre-populated data in a landing page? I am not technical and wondering if a non technical guy like me can get that working
Thanks for your answer
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### Author:  [@seti](https://forum.mautic.org/u/seti)
#### Post date: [October 20, 2015, 2:06pm UTC](https://forum.mautic.org/t/data-security-when-updating-prepopulate-fields/2537/5 "2015-10-20T14:06:12Z")
Of course, you can manage that without technical skills, it’s easy!
Just follow the steps described by Alan in this post: [https://www.mautic.org/community/index.php/307-using-mautic-for-event-registration/0](https://www.mautic.org/community/index.php/307-using-mautic-for-event-registration/0)):
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### Author:  [@silavapi](https://forum.mautic.org/u/silavapi)
#### Post date: [February 2, 2020, 10:57pm UTC](https://forum.mautic.org/t/data-security-when-updating-prepopulate-fields/2537/6 "2020-02-02T22:57:49Z")