CVE-2025-15561 Local Privilege Escalation in NesterSoft WorkTime
Local attackers can escalate privileges to SYSTEM by placing a malicious executable in a world-writable directory monitored by the WorkTime daemon.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-15561?
CVE-2025-15561 is a high-severity vulnerability in NesterSoft Inc. WorkTime (on-prem/cloud), published on 19 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-269
Which versions are affected by CVE-2025-15561?
It affects 1 product.
Products include Nestersoft Worktime.
How do I fix CVE-2025-15561?
No fix has been published for CVE-2025-15561 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-15561 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-15561 exists.
Other vulnerabilities in NesterSoft Inc. WorkTime (on-prem/cloud)
Sources
Also known as GHSA-6x8c-24f7-p33h.