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.
Severity
CVSS 3.0
4.8 medium
CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L
EPSS
0.8% chance of exploitation in the next 30 days; higher than 56% of CVEs (scores of 2026-10-31)