How severe is CVE-2026-40139?

CVE-2026-40139 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-40139 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40139?

CVE-2026-40139 primarily affects Beyondtrust Privileged Remote Access. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-40139?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2026-40139 published?

CVE-2026-40139 was published on 2026-07-06 and last updated on 2026-07-07.

CVE-2026-40139

CVE-2026-40139 is a critical-severity vulnerability in Beyondtrust Privileged Remote Access with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 9.2
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Beyondtrust Privileged Remote Access
Published: 2026-07-06
Last modified: 2026-07-07

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.

Frequently asked questions

What is CVE-2026-40139?: 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.
How severe is CVE-2026-40139?: CVE-2026-40139 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-40139 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40139?: CVE-2026-40139 primarily affects Beyondtrust Privileged Remote Access. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-40139?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2026-40139 published?: CVE-2026-40139 was published on 2026-07-06 and last updated on 2026-07-07.

References

https://www.beyondtrust.com/trust-center/security-advisories/bt26-03

Affected products (2)

cpe:2.3:a:beyondtrust:privileged_remote_access:*:*:*:*:*:*:*:*
cpe:2.3:a:beyondtrust:remote_support:*:*:*:*:*:*:*:*

More vulnerabilities in Beyondtrust Privileged Remote Access

CVE-2026-40141 — Critical (CVSS 9.9): A high-severity vulnerability exists in a web application component of BeyondTrust Remote Support and Privileged Remote…
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CVE-2023-4310 — Critical (CVSS 9.8): BeyondTrust Privileged Remote Access (PRA) and Remote Support (RS) versions 23.2.1 and 23.2.2 contain a command…
CVE-2026-40138 — High (CVSS 8.1): A critical pre-authentication vulnerability exists in the authentication subsystem of BeyondTrust Remote Support and…

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Other CWE-287 (Improper Authentication) vulnerabilities

CVE-2026-45480 — Critical (CVSS 10.0): Improper authentication in Azure Active Directory allows an unauthorized attacker to elevate privileges over a network.
CVE-2026-46389 — Critical (CVSS 10.0): UDS Identity Config builds the Keycloak configuration image (realm, plugins, theme, truststore, JARs) consumed by UDS…
CVE-2026-10611 — Critical (CVSS 10.0): An authentication bypass vulnerability exists in MISP when LDAP mixed authentication is enabled with OTP enforcement.…
CVE-2026-47280 — Critical (CVSS 10.0): Improper authentication in Azure Resource Manager (ARM) allows an unauthorized attacker to elevate privileges over a…
CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…

Browse all CWE-287 (Improper Authentication) vulnerabilities →