CVE-2025-15559
Unauthenticated OS Command Injection in NesterSoft WorkTime
CVSS Score
9.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-78 |
| Vendor | nestersoft inc. |
| Product | worktime (on-prem/cloud) |
| Published | Feb 19, 2026 |
| Last Updated | Feb 23, 2026 |
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Affected Versions
NesterSoft Inc. / WorkTime (on-prem/cloud)
<= 11.8.8
Credits
Tobias Niemann, SEC Consult Vulnerability Lab Daniel Hirschberger, SEC Consult Vulnerability Lab Thorger Jansen, SEC Consult Vulnerability Lab Marius Renner, SEC Consult Vulnerability Lab