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

why is it over writing
Code: $filepaths[] = $_FILES['new_image'];
foreach ($filepaths as $filepath)
{
$imagename =

Help with syntax
Hi all!

The $bridge variable is not getting passed while it is contained in the line below:

natcasesort works on one server but not on another
Hi

I have a problem that I was hoping that someone can help me with.

I'm trying to use

how to get sn motherboard
Hello.
I want to get serial number motherboard, cpu and else hardware.
Can You show me sam

Download Image from URL and Upload it
Ok, I have been googling for the last 1/2 hour trying to figure this out, Most likely I'm just not s

can i optmize image to 50% quality before uploading 2 server
Hi there

i have jus written a php program to upload and display images but when i try to uplo

dropdown box help - open php files to textarea
Hi, I am using tinymce to edit content located in several php files. The code I attached works but i

string to currency format
Hi guys...

Actually I chunk out some data from txtfile and one of the data contains amount va

Simple email form - Newbie
Hello all,

First time poster!

I've been asked to create a simple HTML form that submit

Placing and array within an array then sorting it!
I have a page that runs two large mysql queries and saves the results into arrays, in php I then per