An unauthenticated attacker can inject OS commands when calling a server API endpoint in NesterSoft WorkTime. The server API call to generate and download the WorkTime client from the WorkTime server is vulnerable in the “guid” parameter. This allows an attacker to execute arbitrary commands on the WorkTime server as NT Authority\SYSTEM with the highest privileges. Attackers are able to access or manipulate sensitive data and take over the whole server.
References
History

Tue, 03 Mar 2026 16:45:00 +0000

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

Mon, 23 Feb 2026 19:15:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


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 unauthenticated attacker can inject OS commands when calling a server API endpoint in NesterSoft WorkTime. The server API call to generate and download the WorkTime client from the WorkTime server is vulnerable in the “guid” parameter. This allows an attacker to execute arbitrary commands on the WorkTime server as NT Authority\SYSTEM with the highest privileges. Attackers are able to access or manipulate sensitive data and take over the whole server.
Title Unauthenticated OS Command Injection in NesterSoft WorkTime
Weaknesses CWE-78
References

cve-icon MITRE

Status: PUBLISHED

Assigner: SEC-VLab

Published: 2026-02-19T10:45:34.943Z

Updated: 2026-02-23T18:30:52.019Z

Reserved: 2026-02-04T07:44:28.922Z

Link: CVE-2025-15559

cve-icon Vulnrichment

Updated: 2026-02-23T18:30:44.904Z

cve-icon NVD

Status : Analyzed

Published: 2026-02-19T11:15:55.423

Modified: 2026-03-03T16:39:28.930

Link: CVE-2025-15559

cve-icon Redhat

No data.