{"id":"BIT-mybb-2023-46251","details":" MyBB is a free and open source forum software. Custom MyCode (BBCode) for the visual editor (_SCEditor_) doesn't escape input properly when rendering HTML, resulting in a DOM-based XSS vulnerability. This weakness can be exploited by pointing a victim to a page where the visual editor is active (e.g. as a post or Private Message) and operates on a maliciously crafted MyCode message. This may occur on pages where message content is pre-filled using a GET/POST parameter, or on reply pages where a previously saved malicious message is quoted. The impact is be mitigated when: 1. the visual editor is disabled globally (_Admin CP → Configuration → Settings → Clickable Smilies and BB Code: [Clickable MyCode Editor](https://github.com/mybb/mybb/blob/mybb_1836/install/resources/settings.xml#L2087-L2094)_ is set to _Off_), or 2. the visual editor is disabled for individual user accounts (_User CP → Your Profile → Edit Options_: _Show the MyCode formatting options on the posting pages_ checkbox is not checked). MyBB 1.8.37 resolves this issue with the commit `6dcaf0b4d`. Users are advised to upgrade. Users unable to upgrade may mitigate the impact without upgrading MyBB by changing the following setting (_Admin CP → Configuration → Settings_):- _Clickable Smilies and BB Code → [Clickable MyCode Editor](https://github.com/mybb/mybb/blob/mybb_1836/install/resources/settings.xml#L2087-L2094)_: _Off_. Similarly, individual MyBB forum users are able to disable the visual editor by diabling the account option (_User CP → Your Profile → Edit Options_) _Show the MyCode formatting options on the posting pages_.","aliases":["CVE-2023-46251","GHSA-wj33-q7vj-9fr8"],"modified":"2025-10-15T02:42:29.317267Z","published":"2024-03-06T10:56:49.375Z","database_specific":{"cpes":["cpe:2.3:a:mybb:mybb:*:*:*:*:*:*:*:*"],"severity":"Medium"},"references":[{"type":"WEB","url":"https://github.com/mybb/mybb/commit/6dcaf0b4db6254f1833fe8dae295d9ddc2219276"},{"type":"WEB","url":"https://github.com/mybb/mybb/security/advisories/GHSA-wj33-q7vj-9fr8"},{"type":"WEB","url":"https://mybb.com/versions/1.8.37/"}],"affected":[{"package":{"name":"mybb","ecosystem":"Bitnami","purl":"pkg:bitnami/mybb"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.8.37"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/mybb/BIT-mybb-2023-46251.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"}]}],"schema_version":"1.7.3"}