Vulnerability · Published Sep 24, 2026 · Assigned by icscert
CVE-2026-95699MrSteam iSteamX Improper Isolation or Compartmentalization
Critical 9.6
In plain English
A critical-severity security flaw in iSteamX application from MrSteam. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities).
Severity (CVSS 3.1)9.6Critical
Exploit odds (30 days)0.3%top 77.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| MrSteam | iSteamX application | v1.3.42 (build 44) |
| MrSteam | iSteamX Hub | v4.2.1 |
Weakness: CWE-653 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:H