Horde Groupware 5.2.22 /imp/attachment.php id/u information disclosure

Summaryinfo

A vulnerability identified as problematic has been detected in Horde Groupware 5.2.22. This issue affects some unknown processing of the file /imp/attachment.php. This manipulation of the argument id/u causes information disclosure. This vulnerability appears as CVE-2025-41066. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability classified as problematic was found in Horde Groupware 5.2.22. Affected by this vulnerability is some unknown functionality of the file /imp/attachment.php. The manipulation of the argument id/u with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. The summary by CVE is:

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.

The weakness was presented by Amador Aparicio. It is possible to read the advisory at incibe.es. This vulnerability is known as CVE-2025-41066 since 04/16/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

By approaching the search of inurl:imp/attachment.php it is possible to find vulnerable targets with Google Hacking. The vulnerability scanner Nessus provides a plugin with the ID 277443 (Linux Distros Unpatched Vulnerability : CVE-2025-41066), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (277443). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Groupware Software

Vendor

• Horde

Name

• Groupware

Version

• 5.2.22

License

• free

Website

• Vendor: https://www.horde.org/

CPE 2.3info

• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Be aware that VulDB is the high quality source for vulnerability data.

Discussion