cve-2020-15139
Vulnerability from cvelistv5
Published
2020-08-10 21:35
Modified
2024-08-04 13:08
Severity ?
8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Summary
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.
References
security-advisories@github.comhttps://github.com/mybb/mybb/commit/37ad29dcd25489a37bdd89ebac761f22492558b0Patch, Third Party Advisory
security-advisories@github.comhttps://github.com/mybb/mybb/security/advisories/GHSA-37h7-vfv6-f8rjPatch, Third Party Advisory
security-advisories@github.comhttps://mybb.com/versions/1.8.24/Patch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/mybb/mybb/commit/37ad29dcd25489a37bdd89ebac761f22492558b0Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/mybb/mybb/security/advisories/GHSA-37h7-vfv6-f8rjPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://mybb.com/versions/1.8.24/Patch, Vendor Advisory
Impacted products
Vendor Product Version
MyBB MyBB Version: < 1.8.24
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