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CVE-2026-86105— Fireware OS Improper Authorization in Access Portal Reverse Proxy

Quick assessment

Affected
WatchGuard Fireware OS
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.

Fireware OS 的访问门户反向代理存在授权不当漏洞，允许经过认证的低权限访问门户用户通过发送特制的、针对其他资源的请求（这些资源是其有权访问的），从而访问他们未经授权的其他 Web 应用程序。

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1078.004 · Cloud Accounts
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I. Basic Information for CVE-2026-86105

Vulnerability Information
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Vulnerability Title
Fireware OS Improper Authorization in Access Portal Reverse Proxy
Source: CVE Program / CVE List V5
Vulnerability Description
An improper authorization vulnerability in Fireware OS's Access Portal reverse proxy allows an authenticated, low-privileged Access Portal user to access other web applications they are not authorized for by sending a specially crafted request for a different resource which they are authorized to access.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
Unicode编码处理不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
WatchGuard Fireware OS 2026.3 ~ 2026.3.2 -
WatchGuard Fireware OS 12.0 ~ 12.5.21 -

II. Public POCs for CVE-2026-86105

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III. Intelligence Information for CVE-2026-86105

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Other References for CVE-2026-86105 (1)

Same Patch Batch · WatchGuard · 2026-09-29 · 14 CVEs total

CVE-2026-86131 9.2 CRITICAL Fireware OS Code Injection in BOVPN Over TLS Client Allows Remote Code Execution
CVE-2026-81433 8.7 HIGH Fireware OS Pre-Authentication Stack Buffer Overflow in fingerd Allows Remote Code Executi
CVE-2026-86104 8.7 HIGH Fireware OS Resource Exhaustion in Login Process Allows Denial of Service
CVE-2026-18145 8.6 HIGH Fireware OS Stack-based Buffer Overflow in spamd Allows Remote Code Execution
CVE-2026-13224 8.2 HIGH Fireware OS Path Traversal in WebUI Management Agent Allows Arbitrary Local File Read
CVE-2026-86128 8.2 HIGH Fireware OS NULL Pointer Dereference in NetFlow IPv6 Traffic Processing Allows Remote Deni
CVE-2026-86132 8.2 HIGH Fireware OS Pre-Authentication Integer Underflow in iked Allows Denial of Service
CVE-2026-86133 8.2 HIGH Fireware OS Pre-Authentication Integer Underflow in iked Allows Remote Denial of Service
CVE-2026-13046 7.5 HIGH Fireware OS Deserialization of Untrusted Data in samld Allows Remote Code Execution
CVE-2026-86101 7.2 HIGH Fireware OS Authorization Bypass in SAML Login Allows Unauthorized SSLVPN Access
CVE-2026-90441 7.1 HIGH Fireware OS Missing Authorization in wgagent Management API Allows Denial of Service - Var
CVE-2026-18105 7.1 HIGH Fireware OS Uncontrolled Resource Consumption in Diagnostic Tasks Allows Denial of Service
CVE-2026-86136 7.1 HIGH Fireware OS Missing Authorization in wgagent Management API Allows Denial of Service - Var

IV. Related Vulnerabilities

Same product: Fireware OS
Same vendor: WatchGuard
Same weakness: CWE-176

V. Comments for CVE-2026-86105

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