Spam in WordPress root folder

You got hacked. Use http://sitecheck.sucuri.net/ to check to see sucuri detects the signature.

Tell your host; if they don’t want to help, consider changing hosts to someone more secure, like Recommended WordPress Web Hosting

See FAQ: My site was hacked « WordPress Codex and How to completely clean your hacked wordpress installation and How to find a backdoor in a hacked WordPress and Hardening WordPress « WordPress Codex. Change all passswords. Scan your own PC.

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