FortiWeb <=8.0.3 OOB Write Unauthorized Code Execution
CVE-2026-40688 Published on April 14, 2026
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.
Vulnerability Analysis
CVE-2026-40688 is exploitable with network access, and requires user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
What is a Memory Corruption Vulnerability?
The software writes data past the end, or before the beginning, of the intended buffer. Typically, this can result in corruption of data, a crash, or code execution. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent write operation then produces undefined or unexpected results.
CVE-2026-40688 has been classified to as a Memory Corruption vulnerability or weakness.
Products Associated with CVE-2026-40688
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Affected Versions
Fortinet FortiWeb:- Version 8.0.0, <= 8.0.3 is affected.
- Version 7.6.0, <= 7.6.6 is affected.
- Version 7.4.0, <= 7.4.11 is affected.