CVE-2025-15559
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
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| nestersoft | worktime | to 11.8.8 (inc) |
| nestersoft | worktime | to 11.8.8 (inc) |
Helpful Resources
Exploitability
| 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. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
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.
How can this vulnerability impact me? :
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.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
I don't know