Introducing Sucuri Academy: Your New Destination for Website Security Education
Start your journey in Security Education with Sucuri Academy. Free courses and hands-on labs to enhance your cybersecurity skills.| Sucuri Blog
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 It started like many server emergencies do – with a panicked message about massive server performance issues. A client’s website was grinding to a halt, CPU usage was through the roof, and something called dovecot/lmtp was consuming enormous resources. But this wasn’t just a performance problem – it was the beginning of uncovering a sophisticated spam oper...| Sucuri Blog
When a website fails, your browser returns an HTTP status code that’s short, technical, and often cryptic. You’ve probably seen 404 Not Found or 500 Internal Server Error. Less common, but just as disruptive, is 501 Not Implemented. This guide explains what a 501 error actually means, how it presents in browsers, what typically causes it, how it can affect user trust and SEO, and the most effective, platform‑agnostic steps to resolve it. Continue reading What Is a 501 Error & How to Fix...| Sucuri Blog
Start your journey in Security Education with Sucuri Academy. Free courses and hands-on labs to enhance your cybersecurity skills.| Sucuri Blog
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 external JavaScript from attacker-controlled domains and inserted it into the site’s front-end. Behind the Breach We found a suspicious ...| Sucuri Blog
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 vulnerability patches for the WordPress ecosystem this past month. The vulnerabilities listed below are virtually patched by the Sucuri Fi...| Sucuri Blog
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 credentials as a leading initial access vector because many organizations still rely on simple passwords for SSH and SFTP. Once an outsider lands shell access or...| Sucuri Blog
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 a number of straightforward solutions. In this post, we’ll cover what the WordPress white screen error is, outline the most common reasons for this issue, and detail the steps you can...| Sucuri Blog
Find out how a WordPress backdoor can stealthily maintain unauthorized access to your website and what to do about it.| Sucuri Blog
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 helping to defend email systems is Spamhaus. In this post, we’ll explain what Spamhaus is, how it works, why it matters, and what best practices companies should follow to stay...| Sucuri Blog
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 security, so you can easily manage your content and adapt as your online presence gets bigger. Picking the wrong one can cause a lot of headaches, slowing down your growth and messing with user expe...| Sucuri Blog
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, you’ll want to address it as soon as possible to ensure that your site (and visitors) are protected from phishing and other social engineering attacks. Continue reading How to Fix the “Deceptive Site A...| Sucuri Blog
Learn how SEO spam affects your website and what steps you can take to identify and eliminate this growing problem.| Sucuri Blog
We run a series of tests to illustrate the impact of website caching tools on server performance in the face of multiple concurrent users and DDoS attacks.| Sucuri Blog
Learn how to strengthen your WordPress login security to prevent unauthorized access and protect your website assets.| Sucuri Blog
Find out how malicious JavaScript injects suspicious content and affects website safety, revealing critical security concerns.| Sucuri Blog
Get the latest on WordPress plugin vulnerabilities and patch updates for July 2025. Update now to stay secure!| Sucuri Blog
Learn about the dangers of a fake WordPress plugin that creates hidden admin accounts and compromises site security.| Sucuri Blog
Uncover the dangers of a malicious plugin that can steal admin credentials and compromise your WordPress site security.| Sucuri Blog
Learn about malware attacks and the underlying factors that influence hackers' choices beyond just evil intentions.| Sucuri Blog
Magento security patches are vital in 2025. Our guide covers their significance, installation, and how to stay updated with Adobe.| Sucuri Blog
There are at least 3 types of password attacks: brute force attacks, password spraying and credential stuffing. Find out how these attacks work.| Sucuri Blog
Find out how Sucuri traced a data breach back to Google Tag Manager on a Magento site and restored its security.| Sucuri Blog
Backdoors help attackers maintain unauthorized access to your website. Learn what a backdoor is, how to spot the latest types of malware, and steps you can take to remove them and protect your site.| Sucuri Blog
Learn what the Principle of Least Privilege is, how the PoLP is used to protect your website from unauthorized access and malicious behavior, and common WordPress user roles and file permissions to mitigate risk.| Sucuri Blog
Website owners need to enforce strong credentials for all user accounts, especially administrators. Learn how to create a strong password and protect your site from brute force attacks.| Sucuri Blog
Do you know what website backdoors are? In this post we clarify this concept and explain why leaving backdoors behind will increase the chance of having a site reinfected.| Sucuri Blog
Learn about a JavaScript injection related to Sign1, a massive malware campaign targeting compromised websites. We dive into some common indicators of compromise, document the malware campaign history, and reveal the obfuscation techniques used to evade detection.| Sucuri Blog
Bad actors are using crypto drainers to monetize traffic to hacked sites. Our latest analysis starts with a brief overview of the threat landscape, Angel Drainer scan statistics, predecessors, and most recent variants of this and other website hacks that involve crypto drainers.| Sucuri Blog
What is lateral movement? Learn how malware can move laterally between your websites and how cross-contamination of your hosting and server environments occurs. We include prevention steps to secure your websites and accounts from hackers.| Sucuri Blog
Learn how to understand our free website security scanner and its limitations. Sitecheck works by scanning your website remotely for malware and anomalies.| Sucuri Blog
A detailed analysis of the notable ongoing NDSW/NDSX malware infection with steps on how to identify the telltale if(ndsw===undefined) clause and how clean up the malware from a compromised website.| Sucuri Blog
We describe the techniques we use to find website backdoors and give you advice on how to clean a compromised website: whitelisting, blacklisting, and anomaly checks.| Sucuri Blog
Learn about the fake Google Chrome update malware, a common form of website malware that tricks users into downloading a remote access trojan disguised as a browser update. Understand how it works, its impact on websites, and how to protect your site from such threats. Stay updated on the latest malware trends with Sucuri.| Sucuri Blog
