Vulnerabilities
In-depth guides and analysis on vulnerabilities from the Safeguard engineering team.
71 articles
Edge Appliances Are the Soft Underbelly: VPN Zero-Days as Initial Access in 2026
Check Point's CVE-2026-50751 and Cisco's seventh SD-WAN zero-day of the year are not isolated bugs — they are the same story. Here is why VPN and edge appliances keep becoming the front door for ransomware, and how to monitor and segment them.
Squidbleed (CVE-2026-47729): A 1997 Default Comes Back to Bite Squid
A one-line FTP-parsing bug from 1997 lets any user of a shared Squid proxy read other people's cleartext HTTP requests. We break down the root cause, why ancient defaults survive, and how to remediate.
CVE-2026-20262: Cisco Catalyst SD-WAN Manager Zero-Day File-Write Exploited in the Wild
Cisco confirmed limited in-the-wild exploitation of CVE-2026-20262, an arbitrary file-write zero-day in Catalyst SD-WAN Manager, alongside CVE-2026-20245. Here's what the chain actually buys an attacker and why edge management planes keep ending up on the KEV list.
Defender 'RoguePlanet' Zero-Day (CVE-2026-50656): SYSTEM on Fully Patched Windows
A race condition in Microsoft Defender, dubbed RoguePlanet, reportedly hands attackers SYSTEM privileges on fully updated Windows. We break down what is confirmed, what is still hedged, and what to do while the patch is in development.
CVE-2026-45657: The Wormable-Class Windows Kernel RCE You Should Patch This Week
A CVSS 9.8 zero-day-grade remote code execution flaw in the Windows kernel's TCP/IP path lets unauthenticated attackers run code as SYSTEM with no user interaction. Here's what's confirmed, what's hype, and what to do now.
Patch Tuesday June 2026: ~200 Flaws, 6 Zero-Days, and a Wormable Kernel RCE
Microsoft's June 2026 Patch Tuesday is among the largest on record — roughly 200 fixes, six zero-days including one exploited in the wild, and a top-severity Windows Kernel RCE. Here's what actually matters.
Zero-Day Alert: Chrome V8 CVE-2026-11645 Is Being Exploited in the Wild
Google shipped an emergency Chrome update for CVE-2026-11645, an out-of-bounds memory bug in V8 already exploited in the wild. Here is what the CVE actually means and why your browser patch window just shrank to days.
Check Point VPN Zero-Day CVE-2026-50751: Auth Bypass Under Active Exploitation
Check Point's CVE-2026-50751 lets an attacker dictate how hard the gateway checks them — and walk in without a password. It is rated CVSS 9.3, exploited since early May 2026, and already tied to a Qilin ransomware affiliate.
App Vulnerability Classes: A Field Guide
Not every app vulnerability behaves the same way — this field guide groups the common web vulnerabilities by root cause so triage and prevention actually map to something repeatable.
OpenJDK Vulnerabilities: Tracking and Patching
OpenJDK vulnerabilities are disclosed and patched through Oracle's quarterly Critical Patch Update cycle, but tracking them well means watching your specific JDK distribution and version line, not just assuming a generic update covers you.
DOM-Based XSS: Finding and Fixing Client-Side Injection
DOM XSS never touches your server, so response scanners miss it. Here is how to trace sources to sinks in client code and shut the flaw down.
Nginx 1.18.0 Vulnerabilities: Audit and Upgrade Path
Nginx 1.18.0 left support in 2021, but not every scanner hit is exploitable — and many distro builds are already patched. How to audit what you actually run and get onto a supported line.