CVE-2026-40139
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk47th percentile - higher than 47% of all known CVEs
Summary
A critical pre-authentication vulnerability 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.
Risk Assessment
The organization is at risk of complete compromise of the BeyondTrust Remote Support appliance by an unauthenticated attacker, potentially leading to data theft, privilege escalation, and further attacks on the IT infrastructure.
Recommendation
Immediately update BeyondTrust Remote Support to the latest patched version and review/disable any unnecessary authentication configurations that may be required for exploitation.
Other vulnerabilities in BeyondTrust Remote Support
See all- CVE-2026-40141Critical
A high-severity vulnerability was found in the web application component of BeyondTrust Remote Support and Privileged Remote Access related to input parameter processing. Insufficient input validation may allow an authenticated attacker with limited privileges to access unauthorized resources or data beyond their scope.
- CVE-2026-40140High
A vulnerability in BeyondTrust Remote Support and Privileged Remote Access allows an unauthenticated remote attacker to trigger a denial-of-service (DoS) condition due to insufficient validation of client-supplied input in the network communication subsystem.
Original NVD description (English source)
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.