MyBB is a free and open source forum software. The _Mail Settings_ → Additional Parameters for PHP's mail() function mail_parameters setting value, in connection with the configured mail program's options and behavior, may allow access to sensitive information and Remote Code Execution (RCE). The vulnerable module requires Admin CP access with the `_Can manage settings?_` permission and may depend on configured file permissions. MyBB 1.8.31 resolves this issue with the commit `0cd318136a`. Users are advised to upgrade. There are no known workarounds for this vulnerability.
The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.
The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.
| Link | Tags |
|---|---|
| https://github.com/mybb/mybb/security/advisories/GHSA-hxhm-rq9f-7xj7 | third party advisory |
| https://github.com/mybb/mybb/commit/0cd318136a10b029bb5c8a8f6dddf39d87519797 | third party advisory patch |
| https://github.com/mybb/mybb/blob/mybb_1830/install/resources/settings.xml#L2331-L2338 | third party advisory exploit |
| https://mybb.com/versions/1.8.31/ | release notes vendor advisory |