Fortinet PSIRT Advisory · September 2026

    FortinetScheduled

    11

    Total

    Deduplicated CVEs in this cycle. For Microsoft, only CVEs first published on Patch Tuesday itself count, excluding browser updates, late additions and cloud fixes.

    3

    Critical

    CVEs with CVSS 9.0 or higher (critical per NVD scale).

    0

    Zero-day

    Actively exploited at time of disclosure (CISA KEV or vendor-confirmed).

    0

    KEV

    Listed in CISA's Known Exploited Vulnerabilities catalog: mandatory for US agencies, best practice for everyone.

    By product family

    Unassigned11 CVEs
    Unassigned
    SeverityCVEDescriptionKB articleCVSS
    HighCVE-2026-26084

    A improper access control vulnerability in Fortinet FortiSandbox 5.0.0 through 5.0.5, FortiSandbox 4.4.0 through 4.4.8, FortiSandbox Cloud 5.0.4 through 5.0.5, FortiSandbox PaaS 5.0.4 through 5.0.5 may allow attacker to access sensitive information via crafted HTTP requests.

    		—8.9
    CriticalCVE-2026-84390

    A inclusion of sensitive information in source code vulnerability in Fortinet FortiMonitorOnSight 7.2.4 through 7.2.7, FortiMonitorOnSight 7.2.0 through 7.2.2 may allow attacker to improper access control via <insert attack vector here>

    		—9.6
    CriticalCVE-2026-84388

    A improper restriction of rendered ui layers or frames vulnerability in Fortinet FortiPAM Chrome Extension 8.0 all versions, FortiPAM Chrome Extension 7.4 all versions may allow attacker to information disclosure via remote unauthenticated attack

    		—9.1
    HighCVE-2026-84393

    A improper validation of certificate with host mismatch vulnerability in Fortinet FortiOS 7.6.1 through 7.6.6, FortiProxy 7.6.2 through 7.6.6 may allow attacker to information disclosure via <insert attack vector here>

    		—7.3
    MediumCVE-2026-84387

    A improper neutralization of special elements used in a command ('command injection') vulnerability in Fortinet FortiSandbox 5.2.0, FortiSandbox 5.0.0 through 5.0.6, FortiSandbox 4.4.0 through 4.4.9 may allow attacker to execute unauthorized code or commands via <insert attack vector here>

    		—6.7
    MediumCVE-2026-84391

    A use of uninitialized variable vulnerability in Fortinet FortiAnalyzer 7.6.3 through 7.6.6 may allow attacker to denial of service via <insert attack vector here>

    		—5.9
    MediumCVE-2026-84385

    A improper access control vulnerability in Fortinet FortiSOAR PaaS 7.6.0 through 7.6.6, FortiSOAR PaaS 7.5.0 through 7.5.3, FortiSOAR PaaS 7.4 all versions, FortiSOAR PaaS 7.3 all versions, FortiSOAR on-premise 7.6.0 through 7.6.6, FortiSOAR on-premise 7.5.0 through 7.5.3, FortiSOAR on-premise 7.4 all versions, FortiSOAR on-premise 7.3 all versions may allow attacker to escalation of privilege via <insert attack vector here>

    		—4.9
    MediumCVE-2026-84386

    A unverified ownership vulnerability in Fortinet FortiClientWindows 7.4.0 through 7.4.7, FortiClientWindows 7.2 all versions may allow attacker to improper access control via via an exposed minifilter communication port.

    		—4.7
    MediumCVE-2026-22575

    An improper access control vulnerability in Fortinet FortiManager 7.6.0 through 7.6.4, FortiManager 7.4.0 through 7.4.10, FortiManager 7.2 all versions, FortiManager Cloud 7.6.2 through 7.6.4, FortiManager Cloud 7.4.1 through 7.4.10, FortiManager Cloud 7.2 all versions may allow an administrator to bypass the approval process for workflow sessions via crafted HTTP or HTTPs requests.

    		—4.7
    LowCVE-2026-84389

    A url redirection to untrusted site ('open redirect') vulnerability in Fortinet FortiSIEM 7.5.0 through 7.5.1, FortiSIEM 7.4.1 through 7.4.2 may allow attacker to execute unauthorized code or commands via <insert attack vector here>

    		—2.8
    LowCVE-2026-84392

    A NULL Pointer Dereference vulnerability [CWE-476] vulnerability in Fortinet FortiOS 7.4 all versions, FortiOS 7.2 all versions, FortiPAM 1.9.0, FortiPAM 1.8 all versions, FortiPAM 1.7 all versions, FortiPAM 1.6 all versions, FortiPAM 1.5 all versions, FortiPAM 1.4 all versions, FortiPAM 1.3 all versions, FortiPAM 1.2 all versions, FortiPAM 1.1 all versions, FortiPAM 1.0 all versions, FortiProxy 7.6.0 through 7.6.6, FortiProxy 7.4 all versions, FortiProxy 7.2 all versions may allow an authenticated attacker to crash the httpsd daemon via crafted HTTP requests.

    		—2.5