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Background for this topic.
Fortinet is a cybersecurity vendor best known for FortiGate, a network firewall platform running FortiOS. FortiGate appliances, virtual machines, and cloud deployments provide traffic filtering, VPN access, intrusion prevention, and network segmentation; related products manage devices, collect security telemetry, or protect endpoints. FortiGuard Labs supplies threat intelligence and detection updates used across parts of this ecosystem.
Fortinet matters to security teams because its devices commonly sit at network boundaries and may expose administrative interfaces or SSL-VPN services to the internet. Vulnerabilities in FortiOS or supporting products can therefore create a path to authentication bypass, unauthorized access, or interception of remote connections when affected configurations are present. Practitioners should track Fortinet advisories, promptly apply firmware and signature updates, restrict management access, use multifactor authentication where supported, and monitor device logs and configuration changes. During an incident, preserve firewall and VPN telemetry and review connected systems rather than treating the appliance as an isolated asset.
After gaining a foothold in thousands of Fortinet firewalls, the attackers are starting to monetize that access, and are also piling on a Nextcloud zero-day bug.
A Brazilian banking trojan called Ousaban is going after Windows users who bank in Spain and Portugal. Fortinet's FortiGuard Labs identified the campaign in May 2026
FortiGuard says the Brazilian banking trojan Ousaban is targeting Spain and Portugal via phishing