Open SecurityResearch
The Best Sub Isn't the Best Model
Research
Writing
Insights
Operator-led writing on penetration testing, exposure, and readiness.
CISA KEVKnown exploited
Actively exploited CVEs. The catalog operators watch when a scanner finding becomes a deadline.
Vulnerability Management
Open SecurityCybersecurity Risks
Human Error Cybersecurity Risks: Why They Still Cause Breaches
Cybersecurity Risks
Social deskConference & social
Operator talks, clips, and field posts sampled from the Open Security social desk.
Research
Open SecurityThreat Simulation
What Is Threat Simulation? Why Businesses Need It in 2026
Threat Simulation
Open SecurityFrom the floor
Talks, research notes, and field reports from the people who do the work.
Research
Open SecurityVulnerability Management
The Top Cyber Vulnerabilities Affecting Businesses in 2026
Vulnerability Management
Disclosure deskBounty & research
Coordinated disclosures and bounty-style writeups, tagged so they sit with the work they inform.
Research
Talk through what you are seeing.
Operators can help you decide what to test next.