CVE-2025-15559
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OS Command Injection in NesterSoft WorkTime Server Allows Full Takeover

Publication date: 2026-02-19

Last updated on: 2026-03-03

Assigner: SEC Consult Vulnerability Lab

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.
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Meta Information
Published
2026-02-19
Last Modified
2026-03-03
Generated
2026-06-16
AI Q&A
2026-02-19
EPSS Evaluated
2026-06-15
NVD
CVE-2025-15559
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
nestersoft worktime to 11.8.8 (inc)
nestersoft worktime to 11.8.8 (inc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-78 The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.
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Executive Summary

This vulnerability exists in the NesterSoft WorkTime server API, specifically in the "guid" parameter used when generating and downloading the WorkTime client. An unauthenticated attacker can inject operating system commands through this parameter.

By exploiting this flaw, the attacker can execute arbitrary commands on the WorkTime server with the highest privileges, running as NT Authority\SYSTEM.

This means the attacker can take full control of the server, potentially accessing or manipulating sensitive data.

Impact Analysis

The vulnerability allows an attacker to execute arbitrary commands on the server with the highest system privileges.

This can lead to a complete takeover of the server, unauthorized access to sensitive data, and manipulation or destruction of that data.

Such an attack can disrupt business operations, compromise confidentiality and integrity of data, and potentially lead to further attacks within the network.

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