CVE-2026-1731

BeyondTrust Remote Support (RS) and certain older versions of Privileged Remote Access (PRA) contain a critical (CVSS 4.0: 9.9) pre-authentication operating system command injection vulnerability (CWE-78). By sending specially crafted requests to the appliance, an unauthenticated remote attacker can execute operating system commands in the context of the site user, gaining code execution without credentials or user interaction. Any organization running RS or PRA appliances that are reachable from the internet, which is their typical deployment mode for remote support and privileged access, is affected. Exploitation is active: the flaw was added to CISA's Known Exploited Vulnerabilities catalog on 2026-02-13 with known ransomware use, carries an EPSS of 89.5% (100th percentile), has a public proof-of-concept, and press coverage links the newly patched BeyondTrust RCE to fast-moving ransomware activity (Storm-1175). BeyondTrust has released fixes, so unpatched, internet-exposed instances should be treated as high-priority compromise targets.

What to do: Upgrade all internet-exposed Remote Support and Privileged Remote Access appliances to the fixed releases in BeyondTrust's security advisory immediately, per the CISA KEV required action (apply vendor mitigations or discontinue use if mitigation is unavailable). Until patched, restrict network access to the appliance and review appliance/web logs for suspicious unauthenticated requests, given known ransomware exploitation and the availability of a public proof-of-concept.