ELOG allows an authenticated user to upload arbitrary HTML files. The HTML content is executed in the context of other users when they open the file. Because ELOG includes usernames and password hashes in certain HTTP requests, an attacker can obtain the target's credentials and replay them or crack the password hash offline. In ELOG 3.1.5-20251014 release, HTML files are rendered as plain text.

ELOG allows an authenticated user to modify or overwrite the configuration file, resulting in denial of service. If the execute facility is specifically enabled with the "-x" command line flag, attackers could execute OS commands on the host machine. By default, ELOG is not configured to allow shell commands or self-registration.

ELOG allows an authenticated user to modify another user's profile. An attacker can edit a target user's email address, then request a password reset, and take control of the target account. By default, ELOG is not configured to allow self-registration.

elog 3.1.1 allows remote attackers to post data as any username in the logbook.

ELOG 3.1.4-57bea22 and below is affected by an information disclosure vulnerability. A remote unauthenticated attacker can access the server's configuration file by sending an HTTP GET request. Amongst the configuration data, the attacker may gain access to valid admin usernames and, in older versions of ELOG, passwords.

ELOG 3.1.4-57bea22 and below is affected by a denial of service vulnerability due to a use after free. A remote unauthenticated attacker can crash the ELOG server by sending multiple HTTP POST requests which causes the ELOG function retrieveurl() to use a freed variable.

ELOG 3.1.4-57bea22 and below is affected by an information disclosure vulnerability. A remote unauthenticated attacker can recover a user's password hash by sending a crafted HTTP POST request.

ELOG 3.1.4-57bea22 and below is affected by a denial of service vulnerability due to a NULL pointer dereference. A remote unauthenticated attacker can crash the ELOG server by sending a crafted HTTP GET request.

ELOG 3.1.4-57bea22 and below can be used as an HTTP GET request proxy when unauthenticated remote attackers send crafted HTTP POST requests.