HTTP File Server (HFS) before 2.2c tags HTTP request log entries with the username sent during HTTP Basic Authentication, regardless of whether authentication succeeded, which might make it more difficult for an administrator to determine who made a remote request.

HTTP File Server (HFS) before 2.2c allows remote attackers to obtain configuration and usage details by using an id element such as <id>%version%</id> in HTTP Basic Authentication instead of a username and password, as demonstrated by placing this id element in the userinfo subcomponent of a URL.