MyBB is a free and open source forum software. In affected versions the Admin CP's Settings management module does not validate setting types correctly on insertion and update, making it possible to add settings of supported type `php` with PHP code, executed on on _Change Settings_ pages. This results in a Remote Code Execution (RCE) vulnerability. The vulnerable module requires Admin CP access with the `Can manage settings?` permission. MyBB's Settings module, which allows administrators to add, edit, and delete non-default settings, stores setting data in an options code string ($options_code; mybb_settings.optionscode database column) that identifies the setting type and its options, separated by a new line character (\n). In MyBB 1.2.0, support for setting type php was added, for which the remaining part of the options code is PHP code executed on Change Settings pages (reserved for plugins and internal use). MyBB 1.8.30 resolves this issue. There are no known workarounds.
CVSS Score
7.2
EPSS Score
0.859
Published
2022-03-09
MyBB before 1.8.29 allows Remote Code Injection by an admin with the "Can manage settings?" permission. The Admin CP's Settings management module does not validate setting types correctly on insertion and update, making it possible to add settings of supported type "php" with PHP code, executed on Change Settings pages.
CVSS Score
7.2
EPSS Score
0.007
Published
2021-11-04
MyBB before 1.8.28 allows stored XSS because the displayed Template Name value in the Admin CP's theme management is not escaped properly.
CVSS Score
5.4
EPSS Score
0.003
Published
2021-10-26
SQL Injection vulnerablity in MyBB before 1.8.26 via theme properties included in theme XML files.
CVSS Score
8.8
EPSS Score
0.057
Published
2021-03-15
SQL Injection vulnerability in MyBB before 1.8.26 via poll vote count. (issue 1 of 3).
CVSS Score
8.8
EPSS Score
0.002
Published
2021-03-15
SQL Injection vulnerability in MyBB before 1.8.26 via the Copy Forum feature in Forum Management. (issue 2 of 3).
CVSS Score
7.2
EPSS Score
0.003
Published
2021-03-15
SQL Injection vulnerability in MyBB before 1.8.26 via User Groups. (issue 3 of 3).
CVSS Score
7.2
EPSS Score
0.003
Published
2021-03-15
Cross-site Scripting vulnerability in MyBB before 1.8.26 via Custom moderator tools.
CVSS Score
6.1
EPSS Score
0.002
Published
2021-03-15
Cross-site Scripting (XSS) vulnerability in MyBB before 1.8.26 via Nested Auto URL when parsing messages.
CVSS Score
6.1
EPSS Score
0.022
Published
2021-03-15
MyBB before 1.8.25 allows stored XSS via nested [email] tags with MyCode (aka BBCode).
CVSS Score
5.4
EPSS Score
0.004
Published
2021-02-22