CVE-2025-15559
Unauthenticated OS Command Injection in NesterSoft WorkTime
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.
INFO
Published Date :
Feb. 19, 2026, 11:15 a.m.
Last Modified :
March 3, 2026, 4:39 p.m.
Remotely Exploit :
Yes !
Source :
551230f0-3615-47bd-b7cc-93e92e730bbf
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Update NesterSoft WorkTime to the latest version.
- Restrict access to the WorkTime server API.
- Validate and sanitize all user inputs.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-15559.
| URL | Resource |
|---|---|
| https://r.sec-consult.com/worktime | Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-15559 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-15559
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-15559 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-15559 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Mar. 03, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:nestersoft:worktime:*:*:*:*:cloud:*:*:* versions up to (including) 11.8.8 *cpe:2.3:a:nestersoft:worktime:*:*:*:*:on-premise:*:*:* versions up to (including) 11.8.8 Added Reference Type SEC Consult Vulnerability Lab: https://r.sec-consult.com/worktime Types: Third Party Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Feb. 23, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H -
New CVE Received by 551230f0-3615-47bd-b7cc-93e92e730bbf
Feb. 19, 2026
Action Type Old Value New Value Added 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. Added CWE CWE-78 Added Reference https://r.sec-consult.com/worktime