EIP-2026-118044

PRE-CVE

Valve Steam Client Application 1559/1559 - Local Privilege Escalation

Title source: legacy

Exploitation Summary

EIP tracks 1 public exploit for EIP-2026-118044. PoCs published by LiquidWorm.

AI-analyzed exploit summary The vulnerability involves improper file permissions on Steam.exe and related binaries, allowing any user in the 'Users' group to replace the executable with a malicious binary. This can lead to local privilege escalation when the binary is executed at startup.

Description

Valve Steam Client Application 1559/1559 - Local Privilege Escalation

Exploits (1)

exploitdb WRITEUP

by LiquidWorm · textlocalwindows

https://www.exploit-db.com/exploits/17459

View Code ZIP pw:eip

The vulnerability involves improper file permissions on Steam.exe and related binaries, allowing any user in the 'Users' group to replace the executable with a malicious binary. This can lead to local privilege escalation when the binary is executed at startup.

Classification

Writeup 90%

Attack Type

Lpe

Complexity

Trivial

Reliability

Reliable

Target: Valve Steam Client Application v1559/1559

Auth required

Prerequisites: Local access to the system · User account with access to the 'Users' group

MITRE ATT&CK

T1548.002 - Bypass User Account Control T1068 - Exploitation for Privilege Escalation

devstral-2 · analyzed Feb 16, 2026 Full analysis →

Details

Status pre_cve

Tracked Since Feb 18, 2026