CVE-2025-15559
Unauthenticated OS Command Injection in NesterSoft WorkTime
- State
- Published
- Severity
- 9.8 Critical
- Published
- Feb 19, 2026
- Updated
- Feb 23, 2026
- Reserved
- Feb 4, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | CISA-ADP |
Weaknesses
- CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Affected Products
| Product | Versions |
|---|---|
WorkTime (on-prem/cloud)NesterSoft Inc. |
|
References
- https://r.sec-consult.com/worktimethird-party-advisory
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