CVE-2016-5237: Valvesoftware Steamos

Medium severity, CVSS 4.8. EPSS: 0.8% chance of exploitation in the next 30 days.

Valve Steam 3.42.16.13 uses weak permissions for the files in the Steam program directory, which allows local users to modify the files and possibly gain privileges as demonstrated by a Trojan horse Steam.exe file.

Affected products

• Valvesoftware Steamos: up to and including 3.42.16.13

Published 2017-01-23. Last modified 2026-06-17.