Captcha problem users just refresh and it will let them auto submit again

Posted on 16th Feb 2014 07:03 pm by admin

Users will just re submit and not have to enter the new captcha.. ? Lol but if i refresh the page, the captcha auto makes a new1 so u cant submit.

But if u enter captcha code alrdy, then submit form correctly, and press refresh to auto submit form, it does it? This is a major security risk here is my code, thanks:

Code: session_start();

$RandomStr = md5(microtime());// md5 to generate the random string
$text = rand(10000,99999);
$_SESSION["key"] = $text;
$height = 25;
$width = 35;

$image_p = imagecreate($width, $height);
$black = imagecolorallocate($image_p, 100, 5, 5);
$white = imagecolorallocate($image_p, 155, 155, 025);
$font_size = 16;
$text=substr($_SESSION['key'],0,3);
imagestring($image_p, $font_size, 5, 5, $text, $white);
imagejpeg($image_p, null, 80);

then my HTML:

Code: <tr class="bts ce"><td colspan=2><b>Security Code Confirmation</b></td></tr>

<tr>
<td align="right">Your unique security code<input type="hidden" name="secId" value="76c2b0e6f20ed0f1b209bcf39dee8e06"></td>
<td>
<img src="php_captcha.php">

<span class="desc">If The images are broke, please contact us.</span></span>
</td>
</tr>
Is there a way so people cant auto submit form?

Captcha works if u refresh but people can just auto submit the form and it will keep submiiting...

Your Answer:

Login to answer

Other forums

a very simple php header question (sorry!)
Firstly...I do apologise if this annoys anyone....a header error

I'm do not know php &

Kill a process
I have a question - how can I kill a process from a command line or by using Oracle SQL Developer? I

php mailer
How can i send a mail to large no, say 50,000 reciepients using [color=#0000FF]php mailer[/color]

Need understanding of this bit of code
Code: <?php
// WHERE clause filters
$arrSQLFilters = array();

//

Which PHP-Editor do you think is the best?
Hi everyone,
Myself Brian Anderson. For the last 2 years i have been working a

php and downloading
I want to use a php script to create two files. Then I want it to redirect (or whatever) to have tho

PHP SUBMIT
Code: <input name="doLogin" type="image" src="images/loginsubmit.jpg

ereg_replace in Wordpress
Heya - so I'm working on this site: http://world-of-smiles.theportlandco.com/new-patients

The

Looping Problem
I've got a client that has a database with about 200 events at any given time. I'm trying to loop t

PHP/PKI
I am trying to set up a web application that uses pki. does anyone have a good tutorial to set this