Vulnerability Report

CVE-2026-40138

Title: Critical pre-authentication bypass in BeyondTrust authentication subsystem

Auth Bypass

Proof Of Concept

No public PoC currently indexed for CVE-2026-40138.

CWE Category CWE-287

Published Date Jul 06, 2026

Modified Date Jul 07, 2026

Exploit Status Not Found

Score 9.2 CVSS v4.0

Exploit Probability (EPSS)

0.46%

Vulnerability Summary

CVE-2026-40138: A critical pre-authentication vulnerability exists in the authentication subsystem of BeyondTrust Remote Support and Privileged Remote Access. Improper validation of authentication data may allow a network-positioned attacker to bypass access controls and gain unauthorized access to the appliance, including accounts with elevated privileges. Exploitation requires a specific authentication configuration to be enabled

Impacted Vendors

beyondtrust 2

Reference Links

https://www.beyondtrust.com/trust-center/security-advisories/bt26-03

CVSS v4.0

Source Entity 13061848-ea10-403d-bd75-c83a022c2891

Severity CRITICAL

9.2

Attack Vector

NETWORK

Complexity

HIGH

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

N/A

RAW VECTOR

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1

Source Entity [email protected]

Severity HIGH

8.1