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

Help on Order Entry Form/System Where is best to begin.
I have a dilema and a very short amount of time at this point and I'm looking for some help on decid

value not going in data base
hello friends....
i am having a working javascript....when i am selecting any

Give me all your tricks for minimizing jar file size

Hi, I'm coming close to releasing my J2ME game... I am kicking up against the 64k size barrier w

How to write on database when a link is clicked?
Hi, I have a list of products in a gridview. When the link is clicked currently it takes to an ext

whats wrong with my code please help!!!
this is the error


Warning: mysql_close(): supplied argument is not a valid MySQL-Link res

gmmktime or mktime
I live in the UK, i am within the GMT (with daylight saving time ie 1 hour difrence between summer a

Simple email form - Newbie
Hello all,

First time poster!

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

Passing Arguments to execlp()
I'm writing a program that mimics a unix shell. It's supposed to take commands with arguments and ex

Best PHP Documentation generator
Hello guys!

I would like to hear from you what is the best PHP documentation generator. Perso

Pop-up Banner
Hello Friends,I need to use banner in our client site.Example: www.example.com if i enter this site