# PHP - user input are HTML tags security concern?

**URL:** <https://forum.kirupa.com/t/php-user-input-are-html-tags-security-concern/241201>\
**Category:** programming\
**Created:** [October 10, 2007, 9:22pm UTC](https://forum.kirupa.com/t/php-user-input-are-html-tags-security-concern/241201 "2007-10-10T21:22:10Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![imagined](https://avatars.discourse-cdn.com/v4/letter/i/a87d85/32.png) [@imagined](https://forum.kirupa.com/u/imagined)\
**Post date:** [October 10, 2007, 9:22pm UTC](https://forum.kirupa.com/t/php-user-input-are-html-tags-security-concern/241201/1 "2007-10-10T21:22:10Z")

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I’m developing this site where people can advertise to sale, rent or lease houses. Users can input a description of the house.

What if an user enters tags or code… is that of security concern? I tried to enter the strong tags and it bolded my text. So i guess that means users can enter tags. what if someone enters an iframe… will it compromise the security of my website?