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VulnerabilitiesAug 13, 2026

Fortinet Patches Authentication Flaws in FortiWeb and FortiManager

Fortinet patches eight vulnerabilities, including critical auth flaws in FortiWeb and FortiManager.

Fortinet has released patches for eight security vulnerabilities, with two high-severity authentication flaws in FortiWeb and FortiManager being particularly noteworthy. The FortiWeb vulnerability (CVE-2026-26035) could allow unauthenticated attackers to log in with random credentials if a specific wildcard setting is enabled. The FortiManager vulnerability (CVE-2026-70468) enables remote attackers to impersonate managed FortiGate devices under certain conditions. Fortinet also addressed a buffer overflow bug in FortiClient for Windows.

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The lesson from this incident

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Two high-severity authentication vulnerabilities in Fortinet's FortiWeb and FortiManager products highlight how misconfigured settings and unpatched software can open critical network management infrastructure to unauthenticated attackers. The FortiWeb flaw is particularly alarming because it is triggered by a specific wildcard configuration option, meaning a well-intentioned but poorly understood setting directly enables the attack surface. The FortiManager vulnerability compounds risk by allowing device impersonation, which could let attackers manipulate managed FortiGate devices across an enterprise environment. These flaws matter because network security appliances are high-value targets — compromising them can give attackers control over the very tools designed to protect an organization.

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Indicators of Compromise

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  • cve — CVE-2026-26035
  • cve — CVE-2026-70468
  • cve — CVE-2026-70465
  • cve — CVE-2026-49975

Entities

Fortinet (vendor)FortiWeb (product)FortiManager (product)FortiGate (product)FortiClient (product)Apache HTTP Server (product)