Is CVE-2025-41066 actively exploited?

No active exploitation of CVE-2025-41066 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2025-41066 be exploited remotely?

Yes. CVE-2025-41066 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2025-41066?

CVE-2025-41066 has a CVSS score of 5.3 (MEDIUM).

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MEDIUM

CVE-2025-41066

CWE-200Published: December 2, 2025· Updated: Jun 17, 2026

5.3

CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2025-41066 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

From a weakness classification perspective (CWE-200): Information exposure vulnerabilities leak sensitive data to unauthorized actors.