CVE-2026-40688: Execute unauthorized code or commands in Fortinet FortiWeb
CVE-2026-40688 is an out-of-bounds write vulnerability in Fortinet FortiWeb versions 7. 4. 0 through 7. 4. 11, 7. 6. 0 through 7. 6. 6, and 8. 0.
AI Analysis
Technical Summary
This vulnerability in Fortinet FortiWeb products arises from an out-of-bounds write condition that can be triggered remotely via crafted HTTP requests. It affects multiple versions spanning 7.4.x, 7.6.x, and 8.0.x releases. Successful exploitation requires the attacker to have high privileges and no user interaction is needed. The impact includes full confidentiality, integrity, and availability compromise of the affected system. The vendor has released an official fix to remediate the vulnerability.
Potential Impact
If exploited, this vulnerability allows a remote privileged attacker to execute arbitrary code or commands on the affected FortiWeb device, potentially leading to complete system compromise. The CVSS vector indicates high impact on confidentiality, integrity, and availability. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official patch is available from Fortinet to remediate this vulnerability. Users should apply the vendor-provided updates for FortiWeb versions 7.4.0 through 7.4.11, 7.6.0 through 7.6.6, and 8.0.0 through 8.0.3 as soon as possible to mitigate the risk. Since this is not a cloud service, remediation depends on customer action.
CVE-2026-40688: Execute unauthorized code or commands in Fortinet FortiWeb
Description
CVE-2026-40688 is an out-of-bounds write vulnerability in Fortinet FortiWeb versions 7. 4. 0 through 7. 4. 11, 7. 6. 0 through 7. 6. 6, and 8. 0.
CVSS v3.1
Score 6.7medium
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Fortinet FortiWeb products arises from an out-of-bounds write condition that can be triggered remotely via crafted HTTP requests. It affects multiple versions spanning 7.4.x, 7.6.x, and 8.0.x releases. Successful exploitation requires the attacker to have high privileges and no user interaction is needed. The impact includes full confidentiality, integrity, and availability compromise of the affected system. The vendor has released an official fix to remediate the vulnerability.
Potential Impact
If exploited, this vulnerability allows a remote privileged attacker to execute arbitrary code or commands on the affected FortiWeb device, potentially leading to complete system compromise. The CVSS vector indicates high impact on confidentiality, integrity, and availability. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official patch is available from Fortinet to remediate this vulnerability. Users should apply the vendor-provided updates for FortiWeb versions 7.4.0 through 7.4.11, 7.6.0 through 7.6.6, and 8.0.0 through 8.0.3 as soon as possible to mitigate the risk. Since this is not a cloud service, remediation depends on customer action.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- fortinet
- Date Reserved
- 2026-04-14T22:32:07.399Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
Threat ID: 69dec76b82d89c981f15e82d
Added to database: 4/14/2026, 11:02:03 PM
Last enriched: 5/26/2026, 8:10:06 PM
Last updated: 5/29/2026, 9:17:45 PM
Views: 83
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