Contact Form Spam Attack: An Innocent Feature Caused a Massive Problem
Gabriel Barbosa How a simple “Send a copy to yourself” feature led to 149,700 spam emails and what you can do to prevent it The Emergency Call…
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Security Advisory
251 posts
Malvertising Campaign Hides in Plain Sight on WordPress Websites
Puja Srivastava Recently, one of our customers noticed suspicious JavaScript loading across their WordPress website. Visitors were being served third-party scripts that the site owner never installed.…
Vulnerability & Patch Roundup — September 2025
Sucuri Malware Research Team Vulnerability reports and responsible disclosures are essential for website security awareness and education. Automated attacks targeting known software vulnerabilities are one of the leading causes…
Hidden WordPress Backdoors Creating Admin Accounts
During a recent cleanup of a compromised WordPress website, we discovered two different malicious files designed to silently manipulate administrator accounts. Attackers often inject such…
Vulnerability & Patch Roundup — August 2025
Vulnerability reports and responsible disclosures are essential for website security awareness and education. Automated attacks targeting known software vulnerabilities are one of the leading causes…
Malicious JavaScript Injects Fullscreen Iframe On a WordPress Website
Last month, we came across an ongoing JavaScript-based malware campaign affecting compromised websites. The malware injects a fullscreen iframe that silently loads content from a…
WordPress Vulnerability & Patch Roundup — July 2025
Vulnerability reports and responsible disclosures are essential for website security awareness and education. Automated attacks targeting known software vulnerabilities are one of the leading causes…
Unauthorized Admin User Created via Disguised WordPress Plugin
Recently at Sucuri, we investigated a malware case reported by one of our clients. Their WordPress site was compromised, and the attacker had installed a…
Uncovering a Stealthy WordPress Backdoor in mu-plugins
Recently, our team uncovered a particularly sneaky piece of malware tucked away in a place many WordPress users don’t even know exists: the mu-plugins folder.…
WordPress Redirect Malware Hidden in Google Tag Manager Code
Last month, a customer contacted us after noticing their WordPress website was unexpectedly redirecting to a spam domain. The redirection occurred approximately 4-5 seconds after…
Stealthy PHP Malware Uses ZIP Archive to Redirect WordPress Visitors
Last month, a customer contacted us, concerned about persistent and inexplicable redirects on their WordPress website. Our investigation quickly unearthed a sophisticated piece of malware…