CVE-2026-40139: A critical pre-authentication vulnerability exists in the authentication subsystem of BeyondTrust Remote Suppo

Q: How do I fix CVE-2026-40139?

privileged remote access: upgrade to 25.3.3; remote support: upgrade to 25.3.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-40139 being exploited?

CVE-2026-40139 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-40139 affect?

CVE-2026-40139 affects privileged remote access, remote support. Severity is critical (CVSS 9.8). 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

Q: How urgent is CVE-2026-40139?

Priority 53/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADEUPGRADE

CVE-2026-40139 is a critical-severity flaw (CVSS 9.8) affecting privileged remote access, remote support. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 45%)
CISA exploited list	No
Weakness	CWE-287
Published	2026-07-06
Last modified	2026-07-07

Publisher (CNA): BeyondTrust · Vendor: beyondtrust

Last updated 2026-07-07 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-06 17:16 UTCPublished CVE record published
2026-07-07 18:39 UTCUpdated Record last modified

beyondtrust privileged remote access UPGRADE

Affected: < 25.3.3

Fixed in: 25.3.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy privileged-remote-access || rpm -q privileged-remote-access || privileged-remote-access --version

2. UPGRADE to 25.3.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade privileged-remote-access

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade privileged-remote-access

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

beyondtrust remote support UPGRADE

Affected: < 25.3.3

Fixed in: 25.3.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy remote-support || rpm -q remote-support || remote-support --version

2. UPGRADE to 25.3.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade remote-support

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade remote-support

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-40139?

privileged remote access: upgrade to 25.3.3; remote support: upgrade to 25.3.3. Exact commands for each OS are on this page.

Is CVE-2026-40139 being exploited?

CVE-2026-40139 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-40139 affect?

CVE-2026-40139 affects privileged remote access, remote support. Severity is critical (CVSS 9.8). 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

How urgent is CVE-2026-40139?

Priority 53/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-40141 CRITICAL 9.9 UPGRADE UPGRADE A high-severity vulnerability exists in a web application component of BeyondTrust Remote Support and Privileg
CVE-2026-40140 HIGH 7.5 UPGRADE UPGRADE BeyondTrust Remote Support and Privileged Remote Access contain a high-severity pre-authentication vulnerabili
CVE-2026-40138 HIGH 8.1 UPGRADE UPGRADE A critical pre-authentication vulnerability exists in the authentication subsystem of BeyondTrust Remote Suppo

References

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