Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 21.2%
CVSS Severity
CVSS v3 Score 5.3
References