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CVE-2026-40688

Quick assessment

Affected
Fortinet FortiWeb
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Fortinet FortiWeb是美国飞塔（Fortinet）公司的一款Web应用层防火墙，它能够阻断如跨站点脚本、SQL注入、Cookie中毒、schema中毒等攻击的威胁，保证Web应用程序的安全性并保护敏感的数据库内容。 Fortinet FortiWeb存在缓冲区错误漏洞，该漏洞源于越界写入，可能导致攻击者执行未授权代码或命令。以下版本受到影响：FortiWeb 8.0.0至8.0.3版本、FortiWeb 7.6.0至7.6.6版本和FortiWeb 7.4.0至7.4.11版本。

CVSS 6.7 · High EPSS 6.44% · P93

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-40688

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
Fortinet FortiWeb 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fortinet FortiWeb是美国飞塔（Fortinet）公司的一款Web应用层防火墙，它能够阻断如跨站点脚本、SQL注入、Cookie中毒、schema中毒等攻击的威胁，保证Web应用程序的安全性并保护敏感的数据库内容。 Fortinet FortiWeb存在缓冲区错误漏洞，该漏洞源于越界写入，可能导致攻击者执行未授权代码或命令。以下版本受到影响：FortiWeb 8.0.0至8.0.3版本、FortiWeb 7.6.0至7.6.6版本和FortiWeb 7.4.0至7.4.11版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Fortinet FortiWeb 8.0.0 ~ 8.0.3 cpe:2.3:a:fortinet:fortiweb:8.0.3:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-40688

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III. Intelligence Information for CVE-2026-40688

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Same Patch Batch · Fortinet · 2026-04-14 · 27 CVEs total

CVE-2026-39808 9.1 CRITICAL Fortinet FortiSandbox 操作系统命令注入漏洞
CVE-2026-39813 9.1 CRITICAL Fortinet FortiSandbox 安全漏洞
CVE-2026-39815 7.9 HIGH Fortinet FortiDDoS-F 安全漏洞
CVE-2026-22828 7.3 HIGH Fortinet FortiManager Cloud和Fortinet FortiAnalyzer Cloud 安全漏洞
CVE-2026-23708 6.7 MEDIUM Fortinet FortiSOAR PaaS和Fortinet FortiSOAR on-premise 授权问题漏洞
CVE-2025-61848 6.5 MEDIUM Fortinet多款产品 SQL注入漏洞
CVE-2026-39809 6.2 MEDIUM Fortinet FortiClientEms 安全漏洞
CVE-2025-53847 6.2 MEDIUM Fortinet FortiOS 访问控制错误漏洞
CVE-2026-22155 6.2 MEDIUM Fortinet FortiSOAR PaaS和Fortinet FortiSOAR on-premise 安全漏洞
CVE-2026-25691 6.2 MEDIUM Fortinet FortiSandbox 路径遍历漏洞
CVE-2026-39814 6.2 MEDIUM Fortinet FortiWeb 安全漏洞
CVE-2026-22573 6.2 MEDIUM Fortinet FortiSOAR PaaS和Fortinet FortiSOAR on-premise 路径遍历漏洞
CVE-2024-23104 5.4 MEDIUM Fortinet FortiNDR 信息泄露漏洞
CVE-2026-21742 5.4 MEDIUM Fortinet FortiSOAR PaaS和Fortinet FortiSOAR on-premise 安全漏洞
CVE-2025-68649 5.4 MEDIUM Fortinet多款产品 路径遍历漏洞
CVE-2025-61624 5.4 MEDIUM Fortinet多款产品 路径遍历漏洞
CVE-2026-39810 5.2 MEDIUM Fortinet FortiClientEMS 安全漏洞
CVE-2025-61886 4.9 MEDIUM Fortinet FortiSandbox 跨站脚本漏洞
CVE-2026-39811 4.4 MEDIUM Fortinet FortiWeb 输入验证错误漏洞
CVE-2026-22154 4.4 MEDIUM Fortinet FortiSOAR PaaS和Fortinet FortiSOAR on-premise 跨站脚本漏洞

Showing top 20 of 27 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: FortiWeb
Same vendor: Fortinet
Same weakness: CWE-787

V. Comments for CVE-2026-40688

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