CVE-2025-15559

critical · 9.8

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.

9.8

CVSS

0.5%

EPSS (exploit prob.)

39th

EPSS percentile

2026-02-19

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-78

Affected products

Vendor	Product	Affected versions
nestersoft	worktime	<= 11.8.8
nestersoft	worktime	<= 11.8.8

Check a specific version with /api/v1/cve/match.

References

https://r.sec-consult.com/worktime

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2025-15559