CVE-2025-41066

Horde Groupware v5.2.22 has a user enumeration vulnerability that allows an unauthenticated attacker to determine the existence of valid accounts on the system. To exploit the vulnerability, an HTTP request must be sent to ‘/imp/attachment.php’ including the parameters ‘id’ and ‘u’. If the specified user exists, the server will return the download of an empty file; if it does not exist, no download will be initiated, which unequivocally reveals the validity of the user.

CVSS v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://www.incibe.es/en/incibe-cert/notices/aviso/disclosure-sensitive-information-horde-groupware	Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:horde:groupware:5.2.22:*:*:*:-:*:*:*

History

18 Oct 2026, 18:10

Type	Values Removed	Values Added
Summary		(es) Horde Groupware v5.2.22 tiene una vulnerabilidad de enumeración de usuarios que permite a un atacante no autenticado determinar la existencia de cuentas válidas en el sistema. Para explotar la vulnerabilidad, se debe enviar una solicitud HTTP a '/imp/attachment.php' incluyendo los parámetros 'id' y 'u'. Si el usuario especificado existe, el servidor devolverá la descarga de un archivo vacío; si no existe, no se iniciará ninguna descarga, lo que revela inequívocamente la validez del usuario.

Information

Published : 2025-12-02 14:16

Updated : 2026-10-18 18:10

NVD link : CVE-2025-41066

Mitre link : CVE-2025-41066

CVE.ORG link : CVE-2025-41066

JSON object : View

Products Affected

horde

groupware

CWE

CWE-200

Exposure of Sensitive Information to an Unauthorized Actor

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