Medium severity · published Dec 2, 2025
CVE-2025-41066
Disclosure of sensitive information in Horde Groupware
5.3
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 16% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GR
Groupware · Horde
5.2.22 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-41066
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-41066
Third Party Advisory
https://www.incibe.es/en/incibe-cert/notices/aviso/disclosure-sensitive-information-horde-groupware
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