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CVE-2026-40139

Beyondtrust Remote Support authentication bypass

9.8 CRITICALEPSS 0.75%
  1. Published6 Jul 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Beyondtrust Privileged Remote Access< 25.3.3
Beyondtrust Remote Support< 25.3.3

Remediation

Fixed in
Beyondtrust Privileged Remote Access≥ 25.3.3
Beyondtrust Remote Support≥ 25.3.3

References

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Frequently asked

Is CVE-2026-40139 being actively exploited?

CVE-2026-40139 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.75%.

How severe is CVE-2026-40139?

CVE-2026-40139 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.75% probability of exploitation.

Which products are affected by CVE-2026-40139?

Affected products include Beyondtrust Privileged Remote Access, Beyondtrust Remote Support.

How do I fix CVE-2026-40139?

Upgrade affected software to a fixed version, for example Beyondtrust Privileged Remote Access 25.3.3, Beyondtrust Remote Support 25.3.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-40139 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.