Critical

China-Linked Hackers Exploited BeyondTrust Zero-Day to Take Over Remote Support Servers

The Hacker News

October 16, 2026 at 6:55 AM

Actively Exploited

Overview

A cyber espionage group linked to China, known as Armory Castle, exploited a recently discovered zero-day vulnerability in BeyondTrust Remote Support software. This flaw, identified as CVE-2026-102764, allows unauthorized access to internal messaging components, which could enable attackers to take control of remote support servers. The vulnerability carries a high severity score of 9.3, indicating its potential impact on organizations using this software. Companies that rely on BeyondTrust for remote support need to be vigilant, as this exploit was actively used in the wild shortly after its discovery. Organizations should prioritize patching their systems to mitigate the risk of unauthorized access.

Key Takeaways

Active Exploitation: This vulnerability is being actively exploited by attackers. Immediate action is recommended.
Affected Systems: BeyondTrust Remote Support (formerly Bomgar), affected versions not specified
Action Required: Organizations should apply the latest patches from BeyondTrust for the Remote Support software.
Timeline: Disclosed in late August 2026

Original Article Summary

The China-nexus cyber espionage group tracked as Armory Castle (previously UNC5221 or Warp Panda) exploited a newly disclosed security flaw in BeyondTrust Remote Support (formerly Bomgar) as a zero-day in late August 2026. The vulnerability, tracked as CVE-2026-102764 (CVSS score: 9.3), is a case of improper origin validation in an internal messaging component that could be exploited by a

Impact

BeyondTrust Remote Support (formerly Bomgar), affected versions not specified

Exploitation Status

This vulnerability is confirmed to be actively exploited by attackers in real-world attacks. Organizations should prioritize patching or implementing workarounds immediately.

Timeline

Disclosed in late August 2026

Remediation

Organizations should apply the latest patches from BeyondTrust for the Remote Support software. It is also recommended to review access controls and monitor for any unauthorized access attempts to remote support servers.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to CVE, Zero-day, Exploit, and 1 more.

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