High severity · published Jul 6, 2026
CVE-2026-40140
High-Severity Pre-Authentication Vulnerability in BeyondTrust Remote Support and Privileged Remote Access
7.5
CVSS
0.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 51% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RS
Remote Support · BeyondTrust
through 25.3.2 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-40140
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-40140
Vendor Advisory
https://www.beyondtrust.com/trust-center/security-advisories/bt26-03
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