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Hackers Actively Exploiting Critical BeyondTrust Vulnerability to Deploy VShell and SparkRAT

A critical vulnerability in BeyondTrust's remote support software, identified as CVE-2026-1731, is being actively exploited. This vulnerability allows attackers to execute system commands without requiring authentication. It has been assigned a CVSS…

JBy John MasonFeb 20, 20261 min read

A critical vulnerability in BeyondTrust's remote support software, identified as CVE-2026-1731, is being actively exploited. This vulnerability allows attackers to execute system commands without requiring authentication. It has been assigned a CVSS score of 9.9.

BeyondTrust has issued a security advisory on Mon, Feb 6, 2026, regarding CVE-2026-1731. The vulnerability is an OS command injection (CWE-78) within the thin-scc-wrapper component, exposed to the network via WebSocket.

Sectors affected by this exploit include financial services, healthcare, legal services, higher education, and technology firms across the United States, France, Germany, Australia, and Canada. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added CVE-2026-1731 to its Known Exploited Vulnerabilities (KEV) Catalog on Tue, Feb 13, 2026, urging both federal and private-sector organizations to implement immediate remediation measures.

The attack begins by establishing a WebSocket connection, during which a malformed remoteVersion value is submitted. This value, formatted as a[$(cmd)]0 , is processed by the thin-scc-wrapper script, which executes the injected command due to its treatment as a runnable expression.

Subsequent steps involve deploying web shells and installing a compact PHP backdoor using the eval() function. A bash dropper is then used to plant a password-protected backdoor and temporarily alter Apache configuration files to conceal traces of the attack.

A critical vulnerability in BeyondTrust's remote support software, identified as CVE-2026-1731, is being actively exploited.
John Mason · Thehackingpost

CVE-2026-1731 is related to CVE-2024-12356, another BeyondTrust vulnerability previously exploited by the Silk Typhoon (APT27) group. Both vulnerabilities exhibit insufficient input validation, underscoring the risk posed to remote access platforms.

CVE ID CVSS Score Severity Type Description

CVE-2026-1731 9.9 Critical OS Command Injection (CWE-78) Pre-authentication RCE in thin-scc-wrapper component of BeyondTrust Remote Support and PRA via malformed WebSocket remoteVersion input

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CVE-2024-12356 Critical Critical Input Validation Failure Earlier BeyondTrust WebSocket endpoint flaw exploited by Silk Typhoon (APT27); predecessor to CVE-2026-1731

BeyondTrust advises customers to manually apply the available patches for Remote Support 25.3.2 and Privileged Remote Access 25.1.1. Additionally, users of older versions below 21.3 (RS) or 22.1 (PRA) should upgrade prior to patching.

Based on reporting by Cyber Security News.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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