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.
Published: 2026-02-19
Score: 7.8 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

No analysis available yet.

Remediation

Vendor Solution

The vendor did not respond to our communication attempts anymore. It is currently as of February 2026 unclear, whether a patch is available. Please contact the vendor to request a patch for the identified critical security issues.

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References
History

Thu, 26 Feb 2026 03:00:00 +0000

Type Values Removed Values Added
Weaknesses NVD-CWE-noinfo
CPEs cpe:2.3:a:nestersoft:worktime:*:*:*:*:cloud:*:*:*
cpe:2.3:a:nestersoft:worktime:*:*:*:*:on-premise:*:*:*

Mon, 23 Feb 2026 20:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Mon, 23 Feb 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}


Fri, 20 Feb 2026 10:15:00 +0000

Type Values Removed Values Added
First Time appeared Nestersoft
Nestersoft worktime
Vendors & Products Nestersoft
Nestersoft worktime

Thu, 19 Feb 2026 11:15:00 +0000

Type Values Removed Values Added
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.
Title Local Privilege Escalation in NesterSoft WorkTime
Weaknesses CWE-269
References

Subscriptions

Nestersoft Worktime
cve-icon MITRE

Status: PUBLISHED

Assigner: SEC-VLab

Published:

Updated: 2026-02-23T18:26:47.903Z

Reserved: 2026-02-04T07:44:34.747Z

Link: CVE-2025-15561

cve-icon Vulnrichment

Updated: 2026-02-23T18:26:40.213Z

cve-icon NVD

Status : Analyzed

Published: 2026-02-19T11:15:56.727

Modified: 2026-02-26T02:58:45.617

Link: CVE-2025-15561

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-02-20T10:07:16Z

Weaknesses