by Kastro
Paper/Archive/CVE-2026-95699

CVE-2026-95699

MrSteam iSteamX application — MrSteam iSteamX Improper Isolation or Compartmentalization

EPSS 0.3%CVSS 9.6
critical.is priorityof 100
33
CVSS 9.6 (CNA)9.6 / 10 × 3028.8Not in CISA KEV+300.0EPSS percentile 22.3.223 × 204.5No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
iSteamX applicationv1.3.42 (build 44)–CNA
iSteamX Hubv4.2.1–CNA

Scores by source

icscert (CNA)9.6CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:H
icscert (CNA)8.4CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: partial

References

refraw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/VA/white/2026/va-26-267-01.jsonrefmrsteam.com/contactus