JForum create user Function User Enumeration Vulnerability [CVE-2019-7550]

CVE Number – CVE-2019-7550

A vulnerability in JForum could allow an unauthenticated, remote attacker to access sensitive information on a targeted system.The vulnerability exists in the create user function of the affected software and is due to the way the software handles messages based on username validity. An attacker could exploit this vulnerability by sending mass register/check/username?username= requests to the targeted system. A successful exploit could allow the attacker to access sensitive information, such as valid usernames, to enumerate within the customer environment.Proof-of-concept (PoC) code that demonstrates an exploit of this vulnerability is publicly available.JForum has not confirmed the vulnerability, and software updates are not available.


  • To exploit this vulnerability, an attacker must send a request to the targeted system, making exploitation more difficult in environments that restrict network access from untrusted sources.


  • Administrators are advised to contact the vendor regarding future updates and releases.Administrators are advised to allow only trusted users to have network access.Administrators are advised to run both firewall and antivirus applications to minimize the potential of inbound and outbound threats.Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.Administrators can help protect affected systems from external attacks by using a solid firewall strategy.Administrators are advised to monitor affected systems.

Vendor Announcements

  • At the time this alert was first published, JForum had not released a security advisory.

Fixed Software

  • At the time this alert was first published, JForum had not released a software update.

Duncan Newell

Duncan is a technology professional with over 20 years experience of working in various IT roles. He has a interest in cyber security, and has a wide range of other skills in radio, electronics and telecommunications.

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