Learn. Secure. Lead. We’ re excited to introduce the beta launch of Sucuri Academy—a cutting-edge learning platform designed to empower website owners, developers, and digital professionals with the skills to defend against cyber threats. Whether you’ re just starting out or looking to master advanced security techniques, Sucuri Academy offers…
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Malvertising Campaign Hides in Plain Sight on WordPress Websites
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. After investigation, we discovered the infection originated from a malicious modification in the active theme’s functions.php file. This injected PHP code silently fetched…
Vulnerability & Patch Roundup — September 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 of website compromises. To help educate website owners about potential threats to their environments, we’ve compiled a list of important security updates and…
Enhancing File Transfer Security with SSH Key Authentication
Attackers scan for TCP 22 and 2222 around the clock. When they find an open port, they launch credential-stuffing lists harvested from previous leaks, brute-force scripts, and even malware that hunts for hard-coded passwords in deployment repositories. Verizon’s 2025 Data Breach Investigations Report (DBIR) continues to show stolen…
Troubleshooting WordPress: How to Fix the White Screen of Death (WSoD)
Navigating to your WordPress site only to be met with the White Screen of Death (WSoD) can be a daunting experience. This error denies access to your site for both administrators and visitors, disrupting your website’ s performance and user experience. Despite its prevalence, this common WordPress problem has…
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 backdoors to maintain persistent access to a site, even if their other malware is detected and removed. These files were disguised to look…
Understanding Spamhaus and Its Role in Email Security
In an era when email remains one of the most important forms of communication for business, commerce, and personal use, ensuring that emails reach their intended recipients (and don’t end up in spam, or worse, aiding cybercrime) is more important than ever. One of the often “behind‐the‐scenes” organizations…
Choosing the Best CMS for Your Needs
Knowing which is the right CMS is key when launching a new site. Websites are no longer just online brochures; they’ re where businesses sell products, protect private information, chat with customers, and build their entire online brand. A good CMS gives you flexibility, room to grow, and strong…
How to Fix the “Deceptive Site Ahead” Warning
Did you just try to access your site and encounter a Deceptive Site Ahead warning? This error message occurs when the browser believes your website is unsafe and experiencing security issues — and it can seriously affect your traffic and reputation. When this warning appears on your site, …
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 of website compromises. To help educate website owners about potential threats to their environments, we’ve compiled a list of important security updates and…
What is Phishing?
Phishing is a serious threat to any industry. We have seen this topic appear in the news more each day. You might have already received a fraudulent email from what seemed to be your bank or even seen the hacking that took place during the 2016 US presidential election….
Locking Down the WordPress Login Page
Due to its flexibility, ease of use, and massive plugin ecosystem, WordPress is a favorite among bloggers, developers, and businesses alike. Given its popularity, attackers do not waste time guessing where sensitive assets live. By default, on every WordPress site the front door is conveniently labeled /wp‐login.php or…
How to Make Your Website GDPR Compliant
There is a straightforward reason GDPR keeps legal teams awake at night: fines can reach £17, 500, 000 or 4% of global annual revenue, whichever is higher. Across the incident reports studied over the past few years, the businesses that took the largest reputational hits weren’t the ones that suffered…
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 suspicious external domain. This type of malicious script aims to force users to view unsolicited content, often for ad fraud, traffic generation, or…
Understanding SQL Injection and How to Prevent Attacks
SQL injection, also known as SQLi, is a technique that targets websites and apps using SQL databases. It works by inserting SQL code into a website’ s input fields to gain access to sensitive information, including customer records, intellectual property, and personal data. Any app (web, desktop, or mobile)…
SEO Spam Removal: Protect Search Rankings Before Blocklists Do
SEO spam used to be just annoying, but now it’ s a huge moneymaker for organized crime. These groups are pushing fake meds, illegal gambling, and malware. The second they find a weak spot, they sneak in hidden links, crank out fake pages, and then disappear. You’ re left with…
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 of website compromises. To help educate website owners about potential threats to their environments, we’ve compiled a list of important security updates and…
Why Your Website Might Be Throwing a 421 SNI Error (And What to Do About It)
So, your support team is suddenly flooded with tickets about “421 Misdirected Request” errors, and you’ re wondering if the internet is just having a bad day. Spoiler: it’s not. But Apache might be. Let’s break down what’s going on, why it’s happening now, and how to fix it—whether…
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 fake plugin. Upon analysis revealed that it was a sophisticated backdoor plugin designed to create a persistent and hidden administrator account. What Did…
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. In fact, back in March, we saw a similar trend with hidden malware in this very directory, as detailed in our post Hidden…
