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High · 7.8 CVE-2025-15561 EUVD-2025-207636GHSA-6x8c-24f7-p33h

Local Privilege Escalation in NesterSoft WorkTime

Published Feb 19, 2026 · Updated Feb 23, 2026 · Assigned by SEC-VLab

Description

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.

Affected products

VendorProductAffectedFixed
NesterSoft WorkTime (on-prem/cloud) <= 11.8.8 —

References