Out-of-bounds write in Fortinet FortiWeb
Priority MEDIUM 41CWE-787Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.06438 93rd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Fortinet | FortiWeb | 8.0.0 – 8.0.3; 7.6.0 – 7.6.6; 7.4.0 – 7.4.11 | — | No fix listed | CNA |
- FortiWeb VendorFortinet Affected 8.0.0 – 8.0.3; 7.6.0 – 7.6.6; 7.4.0 – 7.4.11 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:fortinet:fortiweb:*:*:*:*:*:*:*:* | 7.4.0 to before 7.4.12; 7.6.0 to before 7.6.7; 8.0.0 to before 8.0.4 | Vulnerable | Fortinet |
- cpe:2.3:a:fortinet:fortiweb:*:*:*:*:*:*:*:* Versions 7.4.0 to before 7.4.12; 7.6.0 to before 7.6.7; 8.0.0 to before 8.0.4 Vulnerable ·Fortinet
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-40688
- 2026-10-03 Alias added: GHSA-m3qh-6w2c-jgrx
- 2026-10-25 EPSS moved to the 90th–95th percentile
- 2026-10-25 Priority changed: LOW → MEDIUM
References
More Fortinet Fortiweb vulnerabilities
- TI-2026-20057 Authentication bypass in Fortinet FortiWeb KEVCVSS 3.1CRITICAL 9.4
- TI-2025-39856 Path traversal in Fortinet FortiWeb KEVCVSS 3.1CRITICAL 9.4
- TI-2025-18919 SQL injection in Fortinet FortiWeb KEVCVSS 3.1CRITICAL 9.8
- TI-2025-35886 OS command injection in Fortinet FortiWeb KEVCVSS 3.1MEDIUM 6.7
- TI-2021-05113 OS command injection in Fortinet FortiWeb CVSS 3.1HIGH 8.8
- TI-2021-18960 Stack-based buffer overflow in Fortinet FortiWeb CVSS 3.1CRITICAL 9.8
Sources
- CVE-2026-40688 · CVE Program
- CVE-2026-40688 · NVD
- FIRST EPSS
- GHSA-m3qh-6w2c-jgrx · GitHub Advisory Database · CC BY 4.0
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