CVE-2025-15559

9.8 criticalEPSS 0.5%

Critical (9.8) in nestersoft worktime. EPSS 0.5% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

9.8 critical

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

EPSS: 0.5% chance of exploitation in the next 30 days; higher than 43% of CVEs (scores of 2026-10-31)
CWE: CWE-78
Published: 2026-02-19
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

nestersoft:worktime

References

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

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