Fortinet Patches CVE-2026-24858 After Active FortiOS SSO Exploitation Detected
Fortinet has begun releasing security updates to address a critical flaw impacting FortiOS that has come under active exploitation in the wild
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Background for this topic.
CVE is a global system of standardized identifiers for publicly known cybersecurity vulnerabilities. Each record, typically written as CVE-YYYY-NNNN, gives a vulnerability a stable reference and usually includes a description, affected products or versions, and links to advisories or fixes. The CVE Program coordinates the assignment and publication of records through authorized organizations, allowing researchers, vendors, security tools, and defenders to discuss the same flaw without relying on different names.
Practitioners use CVE identifiers to match vulnerabilities across asset inventories, scanners, patch advisories, and threat-intelligence reports. A CVE is an identity, not a severity score or proof that a system is exploitable: prioritization should also consider the affected configuration, exposure, available mitigations, exploit activity, and business impact. Delays in identifying vulnerable versions can leave internet-facing services or embedded components exposed, while incomplete product-to-CVE mapping can cause missed remediation. Security teams should verify the affected versions and vendor guidance before patching or applying workarounds.
Fortinet has begun releasing security updates to address a critical flaw impacting FortiOS that has come under active exploitation in the wild
Fortinet has confirmed a new, actively exploited critical FortiCloud single sign-on (SSO) authentication bypass vulnerability, tracked as CVE-2026-24858, and says it has mitigated the zero-day attacks by blocking FortiCloud SSO connections from devices running vulnerable firmware versions. [...]