CVE-2025-15559criticalCWE-78

CVE-2025-15559: critical vulnerability in NesterSoft Inc. WorkTime (on-prem/cloud)

Unauthenticated OS Command Injection in NesterSoft WorkTime

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28Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 9.8epss 0.5%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
NesterSoft Inc. · WorkTime (on-prem/cloud)
Related CVEs — NesterSoft Inc. WorkTime (on-prem/cloud)

In the same product, most dangerous first.

CVE-2025-15563MEDIUMBroken Access Control results in Denial of Service in NesterSoft WorkTimeEPSS 0.3%CVE-2025-15560HIGHSQL Injection in NesterSoft WorkTimeEPSS 0.3%CVE-2025-15562MEDIUMReflected Cross-Site Scripting in NesterSoft WorkTimeEPSS 0.2%CVE-2025-15561HIGHLocal Privilege Escalation in NesterSoft WorkTimeEPSS 0.1%