Description
In MyBB before version 1.8.24, the custom MyCode (BBCode) for the visual editor doesn't escape input properly when rendering HTML, resulting in a DOM-based XSS vulnerability. The 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. After upgrading MyBB to 1.8.24, make sure to update the version attribute in the `codebuttons` template for non-default themes to serve the latest version of the patched `jscripts/bbcodes_sceditor.js` file.
Remediation
References
Related Vulnerabilities
ZenCart Exposure of Sensitive Information to an Unauthorized Actor Vulnerability (CVE-2009-4322)
MediaWiki Exposure of Resource to Wrong Sphere Vulnerability (CVE-2022-39193)
SharePoint CVE-2023-24950 Vulnerability (CVE-2023-24950)
WordPress Plugin Insert Pages Cross-Site Scripting (3.7.4)
Liferay DXP URL Redirection to Untrusted Site ('Open Redirect') Vulnerability (CVE-2024-25609)