MrSteam iSteamX Improper Isolation or Compartmentalization (CVE-2026-95699) | HOL Guard CVE

High · CVSS 8.4CVE-2026-95699

MrSteam iSteamX Improper Isolation or Compartmentalization

Answer in brief

CVE-2026-95699 records a High severity (CVSS 8.4) vulnerability in MrSteam iSteamX Improper Isolation or Compartmentalization. The current sources do not mark it as known exploited. The current feed maps MrSteam/iSteamX application (generic), MrSteam/iSteamX Hub (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 24, 2026Updated Sep 24, 2026Source checked Sep 25, 2026First seen by HOL Sep 25, 2026Material review Sep 24, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.4
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Not reported

Why this deserves its current priority

CVSS is 8.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps MrSteam/iSteamX application (generic), MrSteam/iSteamX Hub (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
MrSteam/iSteamX applicationgeneric	v1.3.42 (build 44)	Not reported
MrSteam/iSteamX Hubgeneric	v4.2.1	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for MrSteam/iSteamX application, MrSteam/iSteamX Hub.
Review the reported fix. Source-reported solution: The vendor has implemented countermeasures to mitigate this vulnerability and is in effect as of 9/18/2026. Affected users are encouraged to contact them for more information at ( https://www.mrsteam.com/contactus/ ).

Evidence timeline and material changes

Published upstream
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 25, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.