Fortinet Discloses Eight FortiOS Vulnerabilities Including Three Critical Flaws
Fortinet has disclosed multiple vulnerabilities in its FortiOS operating system that powers the company's UTM appliances. The vendor released the information on November 10, 2026, through eight separate security advisories.
Three of the flaws were rated Critical, the highest severity level on Fortinet's four-tier scale. The remaining issues received lower ratings.
Critical vulnerability in high-availability configurations
CVE-2026-126259 affects the redundant configuration feature. When FGSP is used together with configuration synchronization or in an auto-scale deployment, an attacker can send a specially crafted HA packet. This allows execution of arbitrary commands with the highest administrator privileges without any authentication.
BGP daemon issue
CVE-2026-126254 is caused by improper handling of numeric truncation inside the BGP daemon. A configured iBGP peer can send crafted attributes that may be propagated to other connected routers, potentially leading to route manipulation.
OSPF authentication bypass
CVE-2026-126253 resides in the OSPF daemon. An attacker can send a crafted request to inject Link State Advertisements (LSA) without authentication, which could disrupt routing tables or enable further attacks.
Fortinet has published corresponding advisories (FG-IR-26-268, FG-IR-26-267, FG-IR-26-273 and others) that include mitigation steps and patch availability. Organizations running FortiOS are strongly advised to review the advisories and apply updates as soon as possible.
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