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CRITICAL · 9.8

CVE-2026-40139

A critical pre-authentication vulnerability exists in the authentication subsystem of BeyondTrust Remote Support. Improper processing of authentication requests may allow an unauthenticated remote att...

Vulnerability Description

A critical pre-authentication vulnerability exists in the authentication subsystem of BeyondTrust Remote Support. Improper processing of authentication requests may allow an unauthenticated remote 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.

CVSS Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH

Affected Products

VendorProductVersions
BeyondtrustPrivileged Remote Access< 25.3.3
BeyondtrustRemote Support< 25.3.3

Related Weaknesses (CWE)

CWE-287

References

FAQ

What is CVE-2026-40139?

CVE-2026-40139 is a vulnerability with a CVSS score of 9.8 (CRITICAL). A critical pre-authentication vulnerability exists in the authentication subsystem of BeyondTrust Remote Support. Improper processing of authentication requests may allow an unauthenticated remote att...

How severe is CVE-2026-40139?

CVE-2026-40139 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-40139?

Check the references section above for vendor advisories and patch information. Affected products include: Beyondtrust Privileged Remote Access, Beyondtrust Remote Support.