by Kastro
Paper/Archive/CVE-2026-40139

CVE-2026-40139

BeyondTrust Remote Support — Critical Pre-Authentication Vulnerability in BeyondTrust Remote Support and Privileged Remote Access

EPSS 0.8%CVSS 9.8
critical.is priorityof 100
40
CVSS 9.8 (NVD)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 55.0.550 × 2011.0No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Remote Support≤ 25.3.2–CNA
Privileged Remote Access≤ 25.3.2–CNA

Scores by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
BT (CNA)9.2CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refbeyondtrust.com/trust-center/security-advisories/bt26-03