MyBB < 1.6.17 / 1.8.x < 1.8.5 Multiple Vulnerabilities

Medium Nessus Network Monitor Plugin ID 9121


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


Versions of MyBB (MyBulletinBoard) prior to 1.6.17, or 1.8.x prior to 1.8.5 are affected by the following vulnerabilities :

- A validation flaw in the 'member.php' script that can allow a remote attacker to bypass the reset password code check and reset arbitrary passwords. (OSVDB 122738)
- A flaw exists in ACP Mass Mail Cancellation feature 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 Cross-Site Request Forgery (CSRF / XSRF) attack causing the victim to mass cancel mails. (OSVDB 122739)
- A flaw exists which allows users to create usernames with the 'U+200E' unicode characters. This may allow a remote attacker to create usernames that appear overly similar to another user's name. (OSVDB 122740)
- An access flaw exists in 'search.php' that is due to the program failing to check for permissions when searching for posts with old SIDs. This may allow a remote attacker to gain access to potentially sensitive information in old posts. (OSVDB 122741)


Upgrade to MyBB version 1.6.17 / 1.8.5 or later.

See Also

Plugin Details

Severity: Medium

ID: 9121

Family: CGI

Published: 2016/03/03

Modified: 2016/12/12

Dependencies: 9125

Risk Information

Risk Factor: Medium


Base Score: 5

Temporal Score: 4.1

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

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


Base Score: 5.3

Temporal Score: 4.9


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

Vulnerability Information

CPE: cpe:/a:mybb:mybb

Patch Publication Date: 2015/05/27

Vulnerability Publication Date: 2015/05/27