This week in Wordfence Security News (Week of Apr 13, 2026):
- Over 30 WordPress plugins purchased on the Flippa marketplace were turned into backdoors that sat dormant for eight months before activating to inject SEO spam into wp-config.php, visible only to Googlebot
- Smart Slider 3 Pro's update infrastructure was compromised, pushing a weaponized build through the official update channel for approximately six hours before being caught
- Microsoft's second-largest Patch Tuesday ever fixes roughly 165 vulnerabilities including a SharePoint spoofing zero-day already under active exploitation and a Defender privilege escalation zero-day linked to the BlueHammer public exploit
- Adobe released an emergency patch for an Acrobat Reader zero-day exploited in the wild since late 2025, discovered via malicious Russian-language PDFs about gas supply disruptions
- ShinyHunters extortion group listed Rockstar Games on its leak site after stealing authentication tokens from cloud analytics platform Anadot and accessing Rockstar's connected Snowflake data warehouse
- A critical pre-authentication remote code execution flaw in Marimo, an open-source Python notebook platform, was exploited within 10 hours of its advisory being published with no public proof of concept
Timestamps:
0:00 Introduction
0:26 Supply Chain Attack on 30+ Essential Plugin WordPress Plugins
2:08 Smart Slider 3 Pro Update Infrastructure Compromised
2:55 Kali Forms and Ninja Forms File Upload Exploitation Updates
3:21 Microsoft Patch Tuesday with SharePoint and Defender Zero-Days
5:31 Adobe Acrobat Reader Zero-Day Emergency Patch
6:26 ShinyHunters Breach of Rockstar Games via Anadot Tokens
7:16 Marimo RCE Exploited Within 10 Hours of Disclosure
Story Links:
- 30+ Plugins Backdoored After Flippa Acquisition: https://anchor.host/someone-bought-30-wordpress-plugins-and-planted-a-backdoor-in-all-of-them/
- Smart Slider 3 Pro — Supply Chain Compromise: https://smartslider.helpscoutdocs.com/article/2144-wordpress-security-advisory-smart-slider-3-pro-3-5-1-35-compromise
- Kali Forms exploitation update: https://www.wordfence.com/blog/2026/04/attackers-actively-exploiting-critical-vulnerability-in-kali-forms-plugin/
- Ninja Forms File Upload exploitation update: https://www.wordfence.com/blog/2026/04/50000-wordpress-sites-affected-by-arbitrary-file-upload-vulnerability-in-ninja-forms-file-upload-wordpress-plugin/
- April Patch Tuesday — SharePoint Zero-Day Exploited: https://www.bleepingcomputer.com/news/microsoft/microsoft-april-2026-patch-tuesday-fixes-167-flaws-2-zero-days/
- BlueHammer — Defender Zero-Day: https://www.bleepingcomputer.com/news/microsoft/microsoft-april-2026-patch-tuesday-fixes-167-flaws-2-zero-days/
- Adobe Reader Zero-Day — Exploited Since Late 2025: https://helpx.adobe.com/security/products/acrobat/apsb26-43.html
- Rockstar Games Breach via Third-Party Analytics: https://www.bleepingcomputer.com/news/security/stolen-rockstar-games-analytics-data-leaked-by-extortion-gang/
- Marimo RCE — Exploited in Under 10 Hours: https://www.sysdig.com/blog/marimo-oss-python-notebook-rce-from-disclosure-to-exploitation-in-under-10-hours
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