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

Random Number Generation And Probability
Hello, I am working on a function which has to insert data into a SQL table.

we have to suppl

Displaying data from MySql a different way
Hi all,
I'm pretty new to php and MySql and have hit a problem.

I am able to display data

Socket Server Response Headers
Earlier I had a post about my Socket Server, I wasn't able to get it to connect, now I can

I

Multi language - seo links
Im trying to figure out the best method to have a multi language website that will function with seo

Extracting Long text from message class with parameters
Hi,

I would like to extract the long text from a message class. However, the long text ha

Mass activity scheduling
Hi experts,

Im facing some problems to deal with mass activity jobs.
When I run some

Can't find a decent web analytics!!!
I've downloaded and installed Piwik. It's location detection based on IP addresses is fairly inaccur

sql error
I have been looking at this code for 20mins and can't work out what I am doing wrong. There is somet

AUTONUMBER PROBLEM
Hello Everyone,

My name is Jones and i am new to this forum and to oracle. I am using ora

Saving data from a form into a file
Hey everybody,

Sorry, I am really new to PHP coding and such but a project kind of got thrust