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CVE-2026-121638— WatchGuard AuthPoint Gateway Improper Certificate Validation Allows Man-in-the-Middle Attacks

Quick assessment

Affected
WatchGuard AuthPoint Authentication Gateway
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.

WatchGuard AuthPoint Gateway 存在证书验证不当漏洞，使得处于网络路径中的攻击者能够拦截并篡改 AuthPoint Gateway 与本地身份验证提供者之间的通信。

CVSS 9.1 · Critical

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-121638

Vulnerability Information
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Vulnerability Title
WatchGuard AuthPoint Gateway Improper Certificate Validation Allows Man-in-the-Middle Attacks
Source: CVE Program / CVE List V5
Vulnerability Description
An Improper Certificate Validation vulnerability in WatchGuard AuthPoint Gateway allows an attacker with an on-path network position to intercept and modify communications between the AuthPoint Gateway and local authentication providers.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
WatchGuard AuthPoint Authentication Gateway 1.0 ~ 7.6.0 -

II. Public POCs for CVE-2026-121638

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-121638

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Other References for CVE-2026-121638 (1)

Same Patch Batch · WatchGuard · 2026-11-04 · 4 CVEs total

CVE-2026-121639 9.2 CRITICAL WatchGuard AuthPoint Gateway Improper Authentication Allows Unauthenticated Denial of Serv
CVE-2026-121640 9.1 CRITICAL WatchGuard AuthPoint Gateway Capture-replay Allows Unauthorized Administrative Actions
CVE-2026-121637 8.9 HIGH WatchGuard AuthPoint Gateway Improper HMAC Validation in LDAP Authentication Callback Allo

IV. Related Vulnerabilities

Same product: AuthPoint Authentication Gateway
Same vendor: WatchGuard
Same weakness: CWE-295