Information disclosure in Horde Groupware
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.
Vulnerability class: Information Disclosure
EPSS: 0.002 (12.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
Affected products
- Horde Groupware — versions 5.2.22
Weakness classification (CWE)
References
- cve-coordination@incibe.es (Third Party Advisory)
Frequently asked questions
- What is CVE-2025-41066?
- CVE-2025-41066 is a medium-severity vulnerability in Horde Groupware, classified under Information Disclosure. CVSS score: 5.3/10. Published 2025-12-02.
- How severe is CVE-2025-41066?
- Medium severity. CVSS v3 base score is 5.3 out of 10.