MyBB < 1.8.3 / 1.6.16 Multiple Vulnerabilities

High Nessus Network Monitor Plugin ID 8612


The remote web server is running a PHP application that is vulnerable to multiple attack vectors.


The remote web server hosts MyBulletinBoard, a web-based discussion board application. Versions of MyBB prior to 1.8.3 / 1.6.16 are potentially affected by multiple issues :

- A remote code-execution vulnerability because it fails to sufficiently sanitize user-supplied input submitted to the 'shutdown_functions' variable of the 'add_shutdown()' function.

- A security-bypass vulnerability because it fails to destroy the global variables. Specifically, this issue affects the 'unset_globals()' function.

- A flaw exists that may allow unserialize to call PHP magic methods, having an unspecified impact.

- A SQL-injection vulnerability related to theme selection because it fails to sufficiently sanitize user-supplied input before using it in SQL queries.

- An unspecified cross-site scripting vulnerability exists in 'calendar.php' because it fails to validate input before returning it to users.

- An information disclosure vulnerability due to the adminsid cookie not being set to 'httpOnly', potentially exposing cookie data to attackers when a client side script attempts to read it.

- An unspecified stored cross-site scripting vulnerability in 'admin/modules/style/templates.php' and 'admin/modules/config/languages.php'.


Upgrade to MyBB version 1.8.3 or higher.

See Also

Plugin Details

Severity: High

ID: 8612

Family: CGI

Published: 2015/01/19

Modified: 2016/12/12

Dependencies: 9125

Risk Information

Risk Factor: High


Base Score: 7.5

Temporal Score: 6.2

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Temporal Vector: CVSS2#E:F/RL:OF/RC:C


Base Score: 7.3

Temporal Score: 6.8


Temporal Vector: CVSS3#E:F/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:mybb:mybb

Patch Publication Date: 2014/12/04

Vulnerability Publication Date: 2014/11/14

Reference Information

BID: 71273