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 […]
Tag Archives: WordPress Security
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 vulnerability patches for the WordPress ecosystem this […]
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 like regular WordPress components, but their functionality […]
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 security, so you can easily manage your […]
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 vulnerability patches for the WordPress ecosystem this […]
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 /wp‐admin/. On even a modest site, server […]
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 deceptive social engineering. This is the fake […]
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 vulnerability patches for the WordPress ecosystem this […]
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 We Find? The infection was located inside […]
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 Malware Strikes Again: MU-Plugins Under Attack. This […]
