CVE-2025-15561

CVE-2025-15561: Local Privilege Escalation in NesterSoft WorkTime

Vendor Nestersoft Inc.
Product WorkTime (on-prem/cloud)
Weakness CWE-269
Published February 19, 2026
Last update February 23, 2026

CVSS base score

What the vulnerability does

01Description

An attacker can exploit the update behavior of the WorkTime monitoring daemon to elevate privileges on the local system to NT Authority\SYSTEM. A malicious executable must be named  WTWatch.exe and dropped in the C:\ProgramData\wta\ClientExe directory, which is writable by "Everyone". The executable will then be run by the WorkTime monitoring daemon.

Key dates

02Disclosure timeline

February 19, 2026 CVE published
February 23, 2026 Record updated