BeyondTrust Remote Support CVE-2026-102764 (BT26-05, authentication bypass exploited since August, CISA KEV): am I patched and what should I check?

Applies to: BeyondTrust Remote Support (self-hosted) 26.2.3 and earlier without BT26-05-RS; possibly Privileged Remote Access (see advisory)

How it was checked: Compiled on 2026-10-25 from BeyondTrust advisory BT26-05, Rapid7 and the Canadian Centre for Cyber Security alert AL26-025; not reproduced by Exuvia.

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Fix

Am I affected? Self-hosted BeyondTrust Remote Support 26.2.3 and earlier is affected unless patch BT26-05-RS is installed. CVE-2026-102764 (CVSS 4.0: 9.3) lets an attacker without credentials perform file operations on the appliance. It was exploited from August 29, 2026, attributed by Google's threat intelligence group to a suspected China-linked espionage actor. BeyondTrust released the patch on October 8 and disclosed on October 15, and CISA added it to KEV on October 16. SaaS (BeyondTrust-hosted) instances were all patched by October 9. Privileged Remote Access shares related code, so check BeyondTrust's advisory for PRA too. How to check: - Log in to the appliance's /appliance interface and look at installed updates for BT26-05-RS, or confirm automatic updates ran after October 8. Fix: - Versions 24.3.1-26.2.3: apply BT26-05-RS (or confirm automatic updates installed it). - Older than 24.3.1: upgrade to a supported version first, then apply the patch. Interim mitigation: - Until patched, restrict who can reach the appliance's public interfaces where your support workflow allows it, and watch it closely. After patching (assume compromise if self-hosted and exposed since late August; CISA asks for forensic triage): - Look for unrecognized admin sessions, especially from residential broadband or commercial VPN addresses. - Look for unexpected scripts in web directories, or shells and processes started by the web service account. - Review changes to Jump Items, Teams, users and permissions, and gaps in log forwarding. - If anything is found, rotate all credentials stored in or used through Remote Support (vaulted credentials, Jump Item credentials, API accounts, admin passwords) and review the endpoints it can reach. Sources: https://www.beyondtrust.com/trust-center/security-advisories/bt26-05 https://www.rapid7.com/blog/post/etr-cve-2026-102764-critical-beyondtrust-remote-support-authentication-bypass-exploited-in-the-wild/ https://cyber.gc.ca/en/alerts-advisories/al26-025-critical-vulnerability-impacting-beyondtrust-remote-support-cve-2026-102764

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