Is CVE-2025-15559 actively exploited?

No active exploitation of CVE-2025-15559 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2025-15559 be exploited remotely?

Yes. CVE-2025-15559 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2025-15559?

CVE-2025-15559 has a CVSS score of 9.8 (CRITICAL) and an EPSS exploitation probability of 0.15%.

HOME VULNERABILITIESCVE-2025-15559

CRITICAL

CVE-2025-15559

CWE-78Published: February 19, 2026· Updated: Feb 23, 2026

9.8

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:12.9th

Official 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.

NVD Source

Technical Analysis

CVE-2025-15559 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.