MyBB < 1.8.9 Multiple CSRF/XSRF

Medium Nessus Network Monitor Plugin ID 9854


The remote web server is running a PHP application that is vulnerable to a Cross-Site Request Forgery (CSRF/XSRF) attack vector.


Versions of MyBB (MyBulletinBoard) prior to 1.8.9 are affected by a flaw as HTTP requests do not require multiple steps, explicit confirmation, or a unique token when performing certain sensitive actions. By tricking a user into following a specially crafted link, a context-dependent attacker can perform a CSRF/XSRF attack causing the victim to remove subscriptions.


Upgrade to MyBB version 1.8.9 or later.

See Also

Plugin Details

Severity: Medium

ID: 9854

Family: CGI

Published: 2017/01/06

Updated: 2019/03/06

Dependencies: 9126

Risk Information

Risk Factor: Medium

CVSS v2.0

Base Score: 4.3

Temporal Score: 3.7

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

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

CVSS v3.0

Base Score: 3.6

Temporal Score: 3.4

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Temporal Vector: CVSS:3.0/E:X/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:mybb:mybb

Patch Publication Date: 2016/12/21

Vulnerability Publication Date: 2016/12/21