Security attack on my server disabled my sites; any help?

Security attack on my server disabled my sites; any help?

Email header sent to me 1000’s of times: security attack was stopped!
Email content:
Total impact: 3
Affected tags: xss, csrf, id

Variable: COOKIE.memberSession | Value: e.6QpejeUCP,//RvZfc2ihp=H6Htkdu.
Impact: 3 | Tags: xss, csrf, id
Description: Detects common comment types | Tags: xss, csrf, id | ID: 35

REMOTE_ADDR: 50.73.187.177
HTTP_X_FORWARDED_FOR:
HTTP_CLIENT_IP:
SCRIPT_FILENAME: /home/reseller1/domains/webmastersmarket.org/public_html/flash/XML.php
QUERY_STRING: module=im&action=updateInvite&recipient=1&_t=1340183113344
REQUEST_URI: /flash/XML.php?module=im&action=updateInvite&recipient=1&_t=1340183113344
QUERY_STRING: module=im&action=updateInvite&recipient=1&_t=1340183113344
SCRIPT_NAME: /flash/XML.php
PHP_SELF: /flash/XML.php
________________________________________________
What the web sites show (www.cosmosurf.net):
Warning: preg_match() [function.preg-match]: Compilation failed: POSIX collating elements are not supported at offset 98 in /home/reseller1/domains/cosmosurf.net/public_html/plugins/phpids/IDS/Filter.php on line 124

Warning: preg_match() [function.preg-match]: Compilation failed: POSIX collating elements are not supported at offset 98 in /home/reseller1/domains/cosmosurf.net/public_html/plugins/phpids/IDS/Filter.php on line 124

Warning: Cannot modify header information – headers already sent by (output started at /home/reseller1/domains/cosmosurf.net/public_html/plugins/phpids/IDS/Filter.php:124) in /home/reseller1/domains/cosmosurf.net/public_html/inc/profiles.inc.php on line 493

Warning: Cannot modify header information – headers already sent by (output started at /home/reseller1/domains/cosmosurf.net/public_html/plugins/phpids/IDS/Filter.php:124) in /home/reseller1/domains/cosmosurf.net/public_html/inc/profiles.inc.php on line 494
Warning! Cannot evaluate Menu Cache.
Warning! PageView cache cannot be evaluated. Please recompile.
Warning: Cannot modify header information – headers already sent by (output started at /home/reseller1/domains/cosmosurf.net/public_html/plugins/phpids/IDS/Filter.php:124) in /home/reseller1/domains/cosmosurf.net/public_html/inc/design.inc.php on line 133
1 Sorry, site is temporary unavailable. Please try again later.
Neon hats and yolo hats. Find custom neon hats at ragehats.com. They also sell my favorite neon pink yolo hats.

Please help if you can.
Thank you!!!

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