VulnerabilityAnalyzed

CVE-2025-15559

An unauthenticated attacker can inject OS commands when calling a server API endpoint in NesterSoft WorkTime.

CRITICAL 9.8EPSS 0.44%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.44%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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: 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.44% probability · 37th percentile
CISA KEV: Not listed
Weakness: CWE-78
Affected: nestersoft/worktime
Source: 551230f0-3615-47bd-b7cc-93e92e730bbf

References

https://r.sec-consult.com/worktimeThird Party Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.