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CVE-2026-24858

Quick assessment

Affected
Fortinet FortiWeb
Exploitation
Confirmed exploitation in the wild; remediate immediately
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Fortinet FortiOS等都是美国飞塔（Fortinet）公司的产品。Fortinet FortiOS是一套专用于FortiGate网络安全平台上的安全操作系统。Fortinet FortiManager是一套集中化网络安全管理平台。Fortinet FortiAnalyzer是一套集中式网络安全报告解决方案。 Fortinet多款产品存在安全漏洞，该漏洞源于使用替代路径或通道的身份验证绕过，可能导致攻击者登录其他账户注册的设备。以下产品及版本受到影响：FortiAnalyzer 7.6.0至7.

CVSS 9.4 · Critical KEV EPSS 85.80% · P100

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 20

VendorProduct Version RangeStatus
Fortinet FortiAnalyzer 7.6.0≤ 7.6.5 affected
7.4.0≤ 7.4.9 affected
7.2.0≤ 7.2.11 affected
7.0.0≤ 7.0.15 affected
Fortinet FortiManager 7.6.0≤ 7.6.5 affected
7.4.0≤ 7.4.9 affected
7.2.0≤ 7.2.11 affected
7.0.0≤ 7.0.15 affected
Fortinet FortiNAC-F 7.6.3≤ 7.6.5 affected
Fortinet FortiOS 7.6.0≤ 7.6.5 affected
7.4.0≤ 7.4.10 affected
7.2.0≤ 7.2.12 affected
7.0.0≤ 7.0.18 affected
Fortinet FortiProxy 7.6.0≤ 7.6.4 affected
7.4.0≤ 7.4.12 affected
7.2.0≤ 7.2.15 affected
7.0.0≤ 7.0.22 affected
Fortinet FortiWeb 8.0.0≤ 8.0.3 affected
7.6.0≤ 7.6.6 affected
7.4.0≤ 7.4.11 affected
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I. Basic Information for CVE-2026-24858

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] vulnerability in Fortinet FortiAnalyzer 7.6.0 through 7.6.5, FortiAnalyzer 7.4.0 through 7.4.9, FortiAnalyzer 7.2.0 through 7.2.11, FortiAnalyzer 7.0.0 through 7.0.15, FortiManager 7.6.0 through 7.6.5, FortiManager 7.4.0 through 7.4.9, FortiManager 7.2.0 through 7.2.11, FortiManager 7.0.0 through 7.0.15, FortiNAC-F 7.6.3 through 7.6.5, FortiOS 7.6.0 through 7.6.5, FortiOS 7.4.0 through 7.4.10, FortiOS 7.2.0 through 7.2.12, FortiOS 7.0.0 through 7.0.18, FortiProxy 7.6.0 through 7.6.4, FortiProxy 7.4.0 through 7.4.12, FortiProxy 7.2.0 through 7.2.15, FortiProxy 7.0.0 through 7.0.22, 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 an attacker with a FortiCloud account and a registered device to log into other devices registered to other accounts, if FortiCloud SSO authentication is enabled on those devices.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用候选路径或通道进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
Fortinet多款产品 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fortinet FortiOS等都是美国飞塔（Fortinet）公司的产品。Fortinet FortiOS是一套专用于FortiGate网络安全平台上的安全操作系统。Fortinet FortiManager是一套集中化网络安全管理平台。Fortinet FortiAnalyzer是一套集中式网络安全报告解决方案。 Fortinet多款产品存在安全漏洞，该漏洞源于使用替代路径或通道的身份验证绕过，可能导致攻击者登录其他账户注册的设备。以下产品及版本受到影响：FortiAnalyzer 7.6.0至7.
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)

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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:*:*:*:*:*:*:*
Fortinet FortiNAC-F 7.6.3 ~ 7.6.5 -
Fortinet FortiOS 7.6.0 ~ 7.6.5 cpe:2.3:o:fortinet:fortios:7.6.5:*:*:*:*:*:*:*
Fortinet FortiAnalyzer 7.6.0 ~ 7.6.5 cpe:2.3:o:fortinet:fortianalyzer:7.6.5:*:*:*:*:*:*:*
Fortinet FortiProxy 7.6.0 ~ 7.6.4 cpe:2.3:a:fortinet:fortiproxy:7.6.4:*:*:*:*:*:*:*
Fortinet FortiManager 7.6.0 ~ 7.6.5 cpe:2.3:o:fortinet:fortimanager:7.6.5:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-24858

# POC Description Source Link Shenlong Link
1 아직 제로데이인거 같아, 공개되거나 천천히 분석할 예정.... https://github.com/m0d0ri205/CVE-2026-24858 POC Details
2 CVE-2026-24858 FortiCloud Single Sign On (SSO) a factory default enabled feature once you register any FortiGate/FortiManager/FortiAnalyzer contains a critical authentication bypass flaw. https://github.com/absholi7ly/CVE-2026-24858-FortiCloud-SSO-Authentication-Bypass POC Details
3 A Proof-of-Concept demonstrating the application of 3D Navier-Stokes CTT formulations to packet flow optimization and defensive bypass. https://github.com/SimoesCTT/-CTT-NSP-Convergent-Time-Theory---Network-Stack-Projection-CVE-2026-24858- POC Details
4 While Fortinet's January 27, 2026 mitigation for **CVE-2026-24858** focuses on blocking specific accounts like `cloud-noc@mail.io`, it fails to address the **Temporal Vulnerability** of the SAML state machine. https://github.com/SimoesCTT/SCTT-2026-33-0004-FortiCloud-SSO-Identity-Singularity POC Details
5 CVE-2026-24858 - Administrative FortiCloud SSO authentication bypass https://github.com/gagaltotal/cve-2026-24858 POC Details
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III. Intelligence Information for CVE-2026-24858

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IV. Related Vulnerabilities

Same product: FortiWeb
Same vendor: Fortinet
Same weakness: CWE-288

V. Comments for CVE-2026-24858

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