BeyondTrust Remote Support Authentication Bypass by Spoofing Vulnerability
BeyondTrust — Remote Support
- Added to KEV catalog
- 16 October 2026
- Federal remediation due date
- 19 October 2026
- Weakness classification (CWE)
- CWE-290
AI Breakdown
What it is
BeyondTrust Remote Support contains a critical security flaw where internal components fail to properly validate message origins. A remote attacker can exploit this authentication bypass issue by spoofing messages to the system. This allows the attacker to carry out unauthorized file operations directly on the appliance.
Why it matters
This vulnerability carries a maximum-severity CVSS score of 9.8 and allows remote attackers to compromise the appliance without valid credentials. Although known ransomware campaign use is currently unknown, CISA has catalogued it as an active threat requiring federal remediation by October 19, 2026. Unpatched appliances with internet exposure present a significant security risk to the organization.
Recommended action
IT teams must immediately apply vendor mitigations and follow CISA BOD 26-04 risk-based update guidance along with Forensics Triage Requirements. Stakeholders should evaluate the internet exposure of each asset and follow cloud guidance where applicable. If vendor mitigations are unavailable, discontinue use of the product to prevent unauthorized access.
AI-generated from CISA and NVD data — treat as a starting point, not a substitute for your own risk assessment.
CISA Description
BeyondTrust Remote Support contains an authentication bypass by spoofing vulnerability that could allow a remote attacker to perform file operations on the appliance.
Required action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Notes
https://www.beyondtrust.com/trust-center/security-advisories/bt26-05 ; ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-102764
NVD Technical Description
The vulnerability exists within internal components of BeyondTrust’s Remote Support product. The components did not adequately validate the origin of the messages it received. Under the right conditions, this could allow an attacker to perform file operations on the appliance.
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