CVE-2026-95699: Mrsteam Isteamx Application

Critical severity, CVSS 9.6. EPSS: 0.3% chance of exploitation in the next 30 days.

Prior to 9/18/2026, the iSteamX mobile application's AWS policy could grant authenticated users access to wildcard MQTT topics, which can expose other users' device data and allow the attacker to start and stop other connected users' devices. This risked exposing user profile information and potential scalding due to unintended device activation.

Affected products

• Mrsteam Isteamx Application: version v1.3.42 (build 44) only
• Mrsteam Isteamx Hub: version v4.2.1 only

Published 2026-09-24. Last modified 2026-09-25.