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

writing a screen scraper
Hello,

I'm writing a screen scraper application and want to be able to get absolute addresses

Preg_match question
I want to use preg_match to make sure a string is always 6 characters long and only contains 0-9 and

same querie, or a new one??
Hi guys,

I'm still working on this drop down list. I've got the actual drop down list to wor

displaying email without attracting a ton of spam
Hello,

this is maybe the wrong place to ask.
How would you display an email address on a w

Reditecting pages based on logic
Newbie here, apologies in advance!

I am trying to use the header function to forward one of a

Will an XHTML DOCTYPE interfere with my PHP if I'm not experienced enough?
I've read this article here: http://friendlybit.com/html/why-xhtml-is-a-bad-idea/

In a nutshe

Paypal
Hi all,

I have an advanced basic knowledge of php

I want to try something new for a s

single values into sql field
i have a form which i want the user to able to select multiple answers. But i want the answers to be

TimeZoneOffset
Hello,

Please i need your help. I have a system that users can use to punch in and out. This

PHP arrays into arrays need help
Hello
I am trying to highlight the days on my calendar based on the dates that i have in my datab