CVE-2026-40688

unknowncovered by 1 sourcefirst seen 2026-04-15

CVSSv3 Score: 6.7 An out-of-bounds write vulnerability [CWE-787] in FortiWeb CGI daemon may allow a remote privileged attacker to execute arbitrary code or command via crafted HTTP requests. Revised on 2026-04-15 00:00:00

CSIRTS triage

What: An out-of-bounds write vulnerability may allow a remote privileged attacker to execute arbitrary code.
Who is affected: Privileged users of the FortiWeb administrative interface.
Urgency: Remediation is necessary due to the potential for arbitrary code execution.
Action: Update to the latest software version.

AI-assisted analysis generated from the source advisory — verify against the original.

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Exploitation outlook

Moderate exploitation risk6.4% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 93% of all EPSS-scored CVEs.

Advisory coverage (1)

unknownOut-Of-Bounds Write in administrative interfacefortinet · 2026-04-15

External references

NVD record for CVE-2026-40688

CVE.org record

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