CVE-2026-40138
Critical Pre-Authentication Vulnerability in BeyondTrust Remote Support and Privileged Remote Access
Description
A critical pre-authentication vulnerability exists in the authentication subsystem of BeyondTrust Remote Support and Privileged Remote Access. Improper validation of authentication data may allow a network-positioned 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
INFO
Published Date :
July 6, 2026, 5:16 p.m.
Last Modified :
July 7, 2026, 4:16 p.m.
Remotely Exploit :
Yes !
Source :
13061848-ea10-403d-bd75-c83a022c2891
Affected Products
The following products are affected by CVE-2026-40138
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | CRITICAL | 13061848-ea10-403d-bd75-c83a022c2891 | ||||
| CVSS 4.0 | CRITICAL | 13061848-ea10-403d-bd75-c83a022c2891 |
Solution
- Update BeyondTrust Remote Support and Privileged Remote Access.
- Verify the authentication configuration settings.
- Disable specific authentication configurations if possible.
Public PoC/Exploit Available at Github
CVE-2026-40138 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-40138.
| URL | Resource |
|---|---|
| https://www.beyondtrust.com/trust-center/security-advisories/bt26-03 | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-40138 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-40138
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Threat Hunting based on KQL
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-40138 vulnerability anywhere in the article.
-
The Hacker News
BeyondTrust Patches Critical Auth Bypass Flaws in Remote Support and PRA
BeyondTrust has released updates to address two critical security flaws affecting Remote Support (RS) and Privileged Remote Access (PRA) products that, if successfully exploited, could allow unauthent ... Read more
The following table lists the changes that have been made to the
CVE-2026-40138 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 13061848-ea10-403d-bd75-c83a022c2891
Jul. 07, 2026
Action Type Old Value New Value Changed Affected [{'vendor': 'BeyondTrust', 'product': 'Remote Support', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '26.1.1', 'versionType': 'custom'}, {'status': 'affected', 'version': '0', 'lessThan': '25.3.3', 'versionType': 'custom'}], 'defaultStatus': 'unaffected'}, {'vendor': 'BeyondTrust', 'product': 'Privileged Remote Access', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '26.1.1', 'versionType': 'custom'}, {'status': 'affected', 'version': '0', 'lessThan': '25.3.3', 'versionType': 'custom'}], 'defaultStatus': 'unaffected'}] [{'vendor': 'BeyondTrust', 'product': 'Remote Support', 'versions': [{'status': 'affected', 'version': '0', 'versionType': 'custom', 'lessThanOrEqual': '25.3.2'}], 'defaultStatus': 'unaffected'}, {'vendor': 'BeyondTrust', 'product': 'Privileged Remote Access', 'versions': [{'status': 'affected', 'version': '0', 'versionType': 'custom', 'lessThanOrEqual': '25.3.2'}], 'defaultStatus': 'unaffected'}] -
Initial Analysis by [email protected]
Jul. 07, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Added CPE Configuration OR *cpe:2.3:a:beyondtrust:privileged_remote_access:*:*:*:*:*:*:*:* versions up to (excluding) 25.3.3 *cpe:2.3:a:beyondtrust:remote_support:*:*:*:*:*:*:*:* versions up to (excluding) 25.3.3 Added Reference Type BeyondTrust: https://www.beyondtrust.com/trust-center/security-advisories/bt26-03 Types: Vendor Advisory -
CVE Modified by 13061848-ea10-403d-bd75-c83a022c2891
Jul. 07, 2026
Action Type Old Value New Value Changed Affected [{'vendor': 'BeyondTrust', 'product': 'Remote Support', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '26.2.1', 'versionType': 'custom'}, {'status': 'affected', 'version': '0', 'lessThan': '25.3.3', 'versionType': 'custom'}], 'defaultStatus': 'unaffected'}, {'vendor': 'BeyondTrust', 'product': 'Privileged Remote Access', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '26.2.1', 'versionType': 'custom'}, {'status': 'affected', 'version': '0', 'lessThan': '25.3.3', 'versionType': 'custom'}], 'defaultStatus': 'unaffected'}] [{'vendor': 'BeyondTrust', 'product': 'Remote Support', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '26.1.1', 'versionType': 'custom'}, {'status': 'affected', 'version': '0', 'lessThan': '25.3.3', 'versionType': 'custom'}], 'defaultStatus': 'unaffected'}, {'vendor': 'BeyondTrust', 'product': 'Privileged Remote Access', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '26.1.1', 'versionType': 'custom'}, {'status': 'affected', 'version': '0', 'lessThan': '25.3.3', 'versionType': 'custom'}], 'defaultStatus': 'unaffected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 07, 2026
Action Type Old Value New Value Changed SSVC {'id': 'CVE-2026-40138', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-06T18:54:30.820965Z'} {'id': 'CVE-2026-40138', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-06T00:00:00+00:00'} -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 06, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-40138', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-06T18:54:30.820965Z'} -
New CVE Received by 13061848-ea10-403d-bd75-c83a022c2891
Jul. 06, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'BeyondTrust', 'product': 'Remote Support', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '26.2.1', 'versionType': 'custom'}, {'status': 'affected', 'version': '0', 'lessThan': '25.3.3', 'versionType': 'custom'}], 'defaultStatus': 'unaffected'}, {'vendor': 'BeyondTrust', 'product': 'Privileged Remote Access', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '26.2.1', 'versionType': 'custom'}, {'status': 'affected', 'version': '0', 'lessThan': '25.3.3', 'versionType': 'custom'}], 'defaultStatus': 'unaffected'}] Added Description A critical pre-authentication vulnerability exists in the authentication subsystem of BeyondTrust Remote Support and Privileged Remote Access. Improper validation of authentication data may allow a network-positioned 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 Added CVSS V4.0 AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-287 Added Reference https://www.beyondtrust.com/trust-center/security-advisories/bt26-03