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CVE-2025-15559

Nestersoft Worktime command injection

9.8 CRITICALEPSS 0.47%
  1. Published19 Feb 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Nestersoft Worktime≤ 11.8.8

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2025-15559 being actively exploited?

CVE-2025-15559 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.47%.

How severe is CVE-2025-15559?

CVE-2025-15559 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.47% probability of exploitation.

Which products are affected by CVE-2025-15559?

Affected products include Nestersoft Worktime.

How do I fix CVE-2025-15559?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-15559 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.