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    CVE-2026-40688

    An out-of-bounds write vulnerability [CWE-787] vulnerability in Fortinet FortiWeb 8.0.0 through 8.0.3, FortiWeb 7.6.0 through 7.6.6, FortiWeb 7.4.0 through 7.4.11 may allow a remote privileged attacker to execute arbitrary code or command via crafted HTTP requests.

    Published:Apr 14, 2026
    Last Modified:Jun 17, 2026
    EPS:Apr 14, 2026
    EPSS Score:0.06438
    CVSS Score:6.7

    Affected Products

    Vendor
    Fortinet
    Product
    Fortiweb

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-787 Out-of-bounds Write

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-39811 (CVSS 4.9) — A integer overflow or wraparound vulnerability in Fortinet FortiWeb 8.0.0 through 8.0.3, FortiWeb 7.6.0 throug…
    CVE-2026-39814 (CVSS 6.7) — A relative path traversal vulnerability in Fortinet FortiWeb 8.0.0 through 8.0.2, FortiWeb 7.6.0 through 7.6.6…
    CVE-2025-66178 (CVSS 7.2) — A improper neutralization of special elements used in an os command ('os command injection') vulnerability in …
    CVE-2026-24641 (CVSS 2.7) — A NULL Pointer Dereference vulnerability [CWE-476] vulnerability in Fortinet FortiWeb 8.0.0 through 8.0.2, For…
    CVE-2026-24640 (CVSS 6.6) — A Stack-based Buffer Overflow vulnerability [CWE-121] vulnerability in Fortinet FortiWeb 8.0.0 through 8.0.2, …
    CVE-2026-24017 (CVSS 8.1) — An Improper Control of Interaction Frequency vulnerability [CWE-799] vulnerability in Fortinet FortiWeb 8.0.0 …
    CVE-2025-48840 (CVSS 5.3) — An authentication bypass by spoofing vulnerability in Fortinet FortiWeb 7.6.0 through 7.6.3, FortiWeb 7.4.0 th…
    CVE-2026-30897 (CVSS 6.6) — A stack-based buffer overflow vulnerability in Fortinet FortiWeb 8.0.0 through 8.0.3, FortiWeb 7.6.0 through 7…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High