What’s Vulnerable › Vulnerabilities

CVE-2025-41066: Disclosure of sensitive information in Horde Groupware

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-02 · updated 2026-10-18
• Weakness: CWE-200

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.

Affected products

• Horde Groupware: 5.2.22

References

• https://www.incibe.es/en/incibe-cert/notices/aviso/disclosure-sensitive-information-horde-groupware

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