CVE-2025-15559

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 v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://r.sec-consult.com/worktime	Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:nestersoft:worktime:::::cloud:::*
	cpe:2.3:a:nestersoft:worktime:::::on-premise:::*

History

No history.

Information

Published : 2026-02-19 11:15

Updated : 2026-03-03 16:39

NVD link : CVE-2025-15559

Mitre link : CVE-2025-15559

CVE.ORG link : CVE-2025-15559

JSON object : View

Products Affected

nestersoft

worktime

CWE

CWE-78

Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

{"id": "CVE-2025-15559", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}]}, "published": "2026-02-19T11:15:55.423", "references": [{"url": "https://r.sec-consult.com/worktime", "tags": ["Third Party Advisory"], "source": "551230f0-3615-47bd-b7cc-93e92e730bbf"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "551230f0-3615-47bd-b7cc-93e92e730bbf", "description": [{"lang": "en", "value": "CWE-78"}]}], "descriptions": [{"lang": "en", "value": "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 \u201cguid\u201d parameter.\u00a0This 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."}, {"lang": "es", "value": "Un atacante no autenticado puede inyectar comandos del SO al llamar a un endpoint de la API del servidor en NesterSoft WorkTime. La llamada a la API del servidor para generar y descargar el cliente de WorkTime desde el servidor de WorkTime es vulnerable en el par\u00e1metro 'guid'. Esto permite a un atacante ejecutar comandos arbitrarios en el servidor de WorkTime como NT Authority\\SYSTEM con los privilegios m\u00e1s altos. Los atacantes pueden acceder o manipular datos sensibles y tomar el control de todo el servidor."}], "lastModified": "2026-03-03T16:39:28.930", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:nestersoft:worktime:*:*:*:*:cloud:*:*:*", "vulnerable": true, "matchCriteriaId": "F8A53FE8-6F29-462D-B7EB-C3E4F25DBEC3", "versionEndIncluding": "11.8.8"}, {"criteria": "cpe:2.3:a:nestersoft:worktime:*:*:*:*:on-premise:*:*:*", "vulnerable": true, "matchCriteriaId": "0A831FDF-1B71-48B4-BA2D-D2EFB151161A", "versionEndIncluding": "11.8.8"}], "operator": "OR"}]}], "sourceIdentifier": "551230f0-3615-47bd-b7cc-93e92e730bbf"}