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CVE-2026-40140— High-Severity Pre-Authentication Vulnerability in BeyondTrust Remote Support and Privileged Remote Access

AI Predicted 7.5 Difficulty: Easy EPSS 0.57% · P45

Possible ATT&CK Techniques 1AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProductVersion RangeStatus
BeyondTrustPrivileged Remote Access≤ 25.3.2affected
BeyondTrustRemote Support≤ 25.3.2affected
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I. Basic Information for CVE-2026-40140

Vulnerability Information
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Vulnerability Title
High-Severity Pre-Authentication Vulnerability in BeyondTrust Remote Support and Privileged Remote Access
Source: CVE Program / CVE List V5
Vulnerability Description
BeyondTrust Remote Support and Privileged Remote Access contain a high-severity pre-authentication vulnerability in the network communication subsystem. Insufficient validation of client-supplied input may allow an unauthenticated remote attacker to trigger a denial-of-service condition affecting appliance availability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
BeyondTrust Remote Support 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
BeyondTrust remote support是美国BeyondTrust公司的一款远程支持工具。 BeyondTrust Remote Support和Privileged Remote Access存在资源管理错误漏洞，该漏洞源于网络通信子系统中对客户端输入验证不足，可能导致未经身份验证的远程攻击者触发拒绝服务，影响设备可用性。以下版本受到影响：Remote Support 26.2.1之前版本、25.3.3之前版本和Privileged Remote Access 26.2.1之前版本、25.
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

VendorProductAffected VersionsCPESubscribe
BeyondTrustRemote Support 0 ~ 25.3.2 -
BeyondTrustPrivileged Remote Access 0 ~ 25.3.2 -

II. Public POCs for CVE-2026-40140

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III. Intelligence Information for CVE-2026-40140

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Vendor Advisories for CVE-2026-40140 (1)

Same Patch Batch · BeyondTrust · 2026-07-06 · 4 CVEs total

CVE-2026-40139Critical Pre-Authentication Vulnerability in BeyondTrust Remote Support and Privileged Rem
CVE-2026-40138Critical Pre-Authentication Vulnerability in BeyondTrust Remote Support and Privileged Rem
CVE-2026-40141High-Severity Vulnerability In Web Application Component of BeyondTrust Remote Support and

IV. Related Vulnerabilities

Same product: Remote Support
Same vendor: BeyondTrust
Same weakness: CWE-400

V. Comments for CVE-2026-40140

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