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CVE-2026-84393

Quick assessment

Affected
Fortinet FortiOS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Fortinet FortiOS 7.6.1 至 7.6.6 以及 FortiProxy 7.6.2 至 7.6.6 中存在一个证书主机不匹配时的验证不当漏洞，攻击者可能通过 <在此处插入攻击向量> 实现信息泄露。

CVSS 7.3 · High

Affected Version Matrix 2

VendorProduct Version RangeStatus
Fortinet FortiOS 7.6.1≤ 7.6.6 affected
Fortinet FortiProxy 7.6.2≤ 7.6.6 affected
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I. Basic Information for CVE-2026-84393

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A improper validation of certificate with host mismatch vulnerability in Fortinet FortiOS 7.6.1 through 7.6.6, FortiProxy 7.6.2 through 7.6.6 may allow attacker to information disclosure via <insert attack vector here>
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对宿主不匹配的证书验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Fortinet FortiOS 7.6.1 ~ 7.6.6 cpe:2.3:o:fortinet:fortios:7.6.6:*:*:*:*:*:*:*
Fortinet FortiProxy 7.6.2 ~ 7.6.6 cpe:2.3:a:fortinet:fortiproxy:7.6.6:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-84393

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-84393

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Vendor Advisories for CVE-2026-84393 (1)

Same Patch Batch · Fortinet · 2026-09-08 · 9 CVEs total

CVE-2026-26084 8.9 HIGH FortiSandbox 4.4.8/5.0.5 访问控制缺陷
CVE-2026-84387 6.7 MEDIUM FortiSandbox 5.2.0 等版本命令注入漏洞
CVE-2026-84391 5.9 MEDIUM FortiAnalyzer 7.6.3-7.6.6 未初始化变量致拒绝服务
CVE-2026-84385 4.9 MEDIUM FortiSOAR 7.3-7.6 权限提升漏洞
CVE-2026-22575 4.7 MEDIUM FortiManager 7.x 访问控制缺陷
CVE-2026-84386 4.7 MEDIUM FortiClient Windows 7.4.0-7.4.7 未验证所有权
CVE-2026-84389 2.8 LOW FortiSIEM 7.4/7.5 开放重定向漏洞
CVE-2026-84392 2.5 LOW FortiOS/FortiPAM空指针解引用漏洞

IV. Related Vulnerabilities

Same product: FortiOS
Same vendor: Fortinet
Same weakness: CWE-297

V. Comments for CVE-2026-84393

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