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

Navigation include for all site directories
Hi,

I need a navigation include that can deal with directories at different levels on a site.

Adding delete feature to my forum
Hello I am currently trying to add a delete feature to my forum. I believe I have everything built r

PHP - HTTP Digest Authentication - Understanding Code Help
Hi Everyone,

This is my first time on your website and please excuse if I am asking silly que

VAT
how should I deal with VAT?

if I have a product that costs £5.00 and VAT @ 17.5% (£0.87

Image upload - determine folder
I have an upload script that may be accessed from different directories. Problem is, the script is m

Help: calling function
Hi,
Is it possible to call a php function on page close?
If yes, could you explain how and whe

PHP code needed to get/post form fields and request mysql query results.
I'm new to PHP

I've created an html form to allow the user to request a basic telephone dire

Warning: session_start() [function.session-start]: Cann.....
hi, can someone help me with this? I keep getting this error....

Warning: session_start() [fu

Amend code to allow multiple attachments
Hi

I have a php page that allows the user to browse to a file (image) then sumbit, the confi

need help about
i store the value of my select statement result to an array and stored it to a variable named $fname